iForest - Biogeosciences and Forestry

iForest - Biogeosciences and Forestry

Perspective on the control of invasive mesquite trees and possible alternative uses

iForest - Biogeosciences and Forestry, Volume 11, Issue 5, Pages 577-585 (2018)
doi: https://doi.org/10.3832/ifor2456-011
Published: Sep 25, 2018 - Copyright © 2018 SISEF

Review Papers

Mesquite trees continue to invade forests and range lands in many countries across the world. The cost to remove these trees is staggering. In Texas, landowners spent $25 million over a 10-year period to clear 300.000 ha of mesquite trees, a fraction of the 22 million ha of Texas land affected by this invasion. Estimates are that the mesquite continues to negatively impact one to two percent of additional land in selected counties each year in Texas. However, the problem is not unique to Texas, but rather to the 44 species of mesquite trees, belonging to the genus Prosopis found in the pea family (Fabaceae), introduced across the southern United States, South Asia, Africa, the Middle East, South America, and the Caribbean. In response, researchers are searching for economically viable uses for harvested trees and seeds to provide an alternative to the high cost of removal. If viable uses for harvested mesquite trees and seeds are found, then sustained pressure will limit and ultimately reduce the negative impact from these invasive trees. One key factor to controlling this invasive species is to find economically and environmentally sustainable uses to help pay the costs of removal or perhaps make removal less necessary. Traditional uses of mesquite are as a building material, as a source of food for both animals and humans and as wood for charcoal. Emerging uses of mesquite are new applications as a biofuel and as a bio-filter medium for water. Moreover, forestry land management of mesquite has adapted to include the tree as a component of hunting lands. New control methodologies and technologies are based on an increased understanding of mesquite growth patterns, using recommended practices that reduce control and eradication costs while improving the efficiency of land management. Previous land management practices have proven that excessive application of herbicides, physical removal of mesquite trees, or human-induced brush fires, if not carefully planned, only worsen mesquite infestations. The growing problem of mesquite land management provides an opportunity for continued research into novel ways to utilize mesquite biomass, of both wood and seed pods.

Mesquite, Land Management, Prosopis spp., Biofuel


The 44 species of Prosopis (Fabaceae), commonly known as mesquite in the English language, khejri in Hindu, or algarroba in Spanish, are spread across large regions of the southern United States, South Asia, Africa, the Middle East, South America, and the Caribbean ([16], [45]). The origin of the Prosopis genus is traced to Argentina, where 34 of the 44 species are native to Argentina’s northern region ([45]). It stands to reason that much of the research studying the biology of the Prosopis species are centered in Argentina at the Universidad Católica de Santiago del Estero ([25]).

Texas, the second largest state in the United States of America (USA), has a land mass of nearly 70 million ha, 22 million ha of which have been reduced in value due to mesquite invasion. Mesquite’s rapid expansion started when early cattle ranchers in Texas initially used mesquite seed pods as feed to supplement cattle diets during long cattle drives to Northern markets. While passing through an animal digestive tract, the mesquite seeds are scarified and then excreted in manure, which is a perfect growing medium. These processes contributed to mesquite’s rapid expansion across much of Texas’ rangeland ([22]).

Over the 10-year period from Fiscal Year 2000 to Fiscal Year 2010 the Texas State Soil and Water Conservation Board (TSSWCB) spent almost 50 million US $ treating approximately 300.000 ha with herbicides and the mechanical removal of this invasive species. The goal of the TSSWCB efforts were to enhance water availability through selective brush control ([57]). Mesquite trees have continued to invade additional land, increasing their coverage by about two percent annually in certain Texas counties, based on long term studies conducted since 1976, which observed the changes in honey mesquite (Prosopis glandulosa) canopy cover during a 20-year period ([4]). Thus, mesquite continues to increase in land coverage in spite of huge expenditures on control measures. The immense density of the mesquite species invasion in the USA remains the highest in Texas (Fig. 1). In addition to diminishing the value of Texas grazing lands, mesquite trees’ expansion in southeastern New Mexico negatively impacted the breeding of lesser prairie-chicken (Tympanuchus pallidicinctus), a species of conservation concern ([13]).

Fig. 1 - Adapted map of non-federal rangeland where mesquite species are present ([29]).

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Mesquite trees are legumes and like many legumes have the ability to enrich the soil around their roots by fixing atmospheric nitrogen symbiotically with particular soil bacteria. This ability to enrich soil initially made them attractive to combat desertification, especially in arid African countries ([31], [48]). Members of the genus Prosopis are, in some aspects, the ideal candidate to combat desertification across wide expanses of the world because mesquite trees can grow in highly alkaline soils, tolerating a pH up to 9.5 to 10.0 and a soluble salt content between 0.54% and 1.0% ([45]). However, in many parts of the world their uncontrolled spread has significantly decreased the value of the rangeland they were meant to improve and enrich. Unfortunately, mesquite trees can quickly become a biological nightmare as happened in Sudan. Sudan once heralded the mesquite as the “miracle tree” that could help stave off the threat of desertification and increase the biodiversity in Sudan’s deserts ([11]). However, mesquite now completely dominates portions of Sudan’s once tillable farm land and has been reclassified as a noxious weed as part of their government-sponsored mesquite eradication program ([45], [48]).

Prosopis juliflora trees have an extensive root system which have been found to penetrate as deep as 53 m ([35]), and the P. glandulosa’s root depth has been recorded down to 50 m ([17]). These deep root systems are combined with a surface root system that may cover up to 15 m in circumference, together making them a fierce competitor for soil moisture. Mesquite trees can become quite large with the honey mesquite known to grow to 7.6 m in height with its main support trunk as large as 0.6 m in diameter. Normally, a mesquite tree has a single main trunk with minimal ancillary branching; however, damage to the upper portion of the tree from either animal foraging or human eradication efforts, causes multiple re-sprouting of the stems which can exacerbate the problems of mesquite invasion. During a drought, vegetative growth stops, but will resume quickly after a period of rainfall. Flowering occurs as leaves develop and will later form the seed pods of the mesquite tree ([3]).

As legumes, mesquite trees have a symbiotic relationship with bacteria of the genus Rhizobium in their root nodules, which is where atmospheric nitrogen fixation occurs in the soil. Increased understanding of biological nitrogen fixation has occurred by measuring nitrogen-fixation in Prosopis glandulosa. Soper et al. ([50]) took samples from the entire nitrogen uptake pathway including soil solution, xylem sap, and foliage; a large variation of about 70% was found in nitrogen fixation values from each of these sampling locations. The quantity of nitrogen fixation is inversely related to the diameter of the mesquite tree ([39]). Thus, a younger mesquite tree will fix more nitrogen than a larger, more mature tree. This characteristic probably enables newly established mesquite trees to colonize even the lowest fertility soils. Mature trees appear to obtain most of their nitrogen needs from the soil ([31]). This fixation of nitrogen may be related to the fact that certain species of mesquite can grow in saline soils (soils with high levels of salt) with salt levels 10 times greater than the maximum salt levels tolerated by common commercial legumes, such as soybeans ([60]).

Mesquite and some species of the genus Acacia, another nitrogen-fixing tree, have been estimated to be able to fix 30-40 kg N ha-1 year-1 ([28]). Leaf and branch litter that fall from the mesquite trees was also shown to increase the resorption of nitrogen and phosphorus, further contributing to soil enrichment ([63]). The increase in organic soil carbon from the decomposition of leaf and branch litter can contribute to the soil’s water-holding and nutrient-binding capability, especially in sandy soils.

This review paper was researched by using search terms such as “mesquite”, “algarroba”, “Prosopis”, and “Prosopis glandulosa” in the Web of Science and Direct Science databases to generate the articles reviewed. We decided to focus on the particular mesquite species found in Texas, P. glandulosa, which has thus far eluded effective and efficient brush management over several decades. Personal interviews were conducted with mesquite management experts to understand in depth the issues facing brush management of the Prosopis species. While taking a cross-sectional review of potential solutions for Prosopis brush management around the world, this paper emphasizes P. glandulosa bush management in southwest North America as a focal point.

  Control of mesquite as an invasive species 

Careful and consistent land management is required to remove established mesquite trees and to prevent their aggressive reinvasion. Land managers have studied mechanical, chemical, fire, and biological control agents to control mesquite’s unwanted growth which currently covers nearly one-third of Texas’ pasture lands. In Texas, a mature mesquite tree can translocate as much as 167 L of water per day. TSSWCB estimated that removing 7 ha (17 acres) of established mesquite trees is equivalent of saving more than 1.2 million L of water per year ([57]).

A possible control mechanism for mesquite growth is to restrict groundwater availability in controlled areas. Empirical hydrological and vegetational data have been used to create a model for P. velutina to explore the capacity for translocation of ground water and the potential for damaging the development of riparian ecosystems. The model predicted that a stand of P. velutina with height greater than 12 m translocates groundwater from depths of approximately 6 m or less ([52]).

In addition, access to ground water enabled the proliferation of the P. pallida on the highlands of Hawaii ([24]). P. pallida in this region received more rainfall and developed differently from the lowland P. pallida, which received less rainfall and had greater access to groundwater. Moreover, the lowland P. pallida showed increased uptake rates of carbon (C), nitrogen (N), and phosphorus (P), which contributed to the access to groundwater. Indeed, higher N mass concentration in the soil as well as denser canopies, larger basal trunk area and larger leaf area were found in sites where P. pallida had access to groundwater. The use of various water sources was measured and confirmed by oxygen-stable isotope ratios. If access to groundwater is reduced by either humankind or natural methods linkage between groundwater and self-generated soil nutrients will be minimized ([24]).

Seed pods of the mesquite tree were used extensively by early cattle ranchers to feed their livestock which contributed to the change in grassland ecology, especially in the Southern USA, Argentina, Australia and Africa ([9]). As cattle grazed down the grass, removing the principal vegetative competitor to the mesquite trees, the mesquite seedlings sprouting from piles of manure were able to rapidly encroach on the former grass lands. Once established, the extensive surface root systems of the mesquite trees acted as competitive growth inhibitors, preventing the grassland’s regrowth after being over-grazed. Locations with high stock-loadings, even in different countries, have the highest density of mesquite because of the cycle of (1) cattle overgrazing, clearing the grasslands (2) the hungry cattle eat the mesquite pods, the cattle’s digestive system scarifies the seeds which are then excreted in a manure rich environment-perfect for sprouting, and (3) these newly sprouted mesquite seedlings further inhibit the regrowth of grass while encouraging further growth of the mesquite seedling. The density of mesquite trees can be huge, up to 10.000 small (1 to 2 cm diameter) stems ha-1 in a new land that has been invaded for less than 10 to 15 years ([41]). Poor land management practices with years of sporadic mesquite treatments (herbicides, mechanical removal and control fires) only damage the above soil portion of the mesquite trees. Once damaged, the original few-stemmed trees regrow and resprout as multi-stemmed thickets, thus worsening the mesquites’ negative impacts ([3]).

  Current control measures 


Mechanical removal of mesquite trees has an immediate positive impact on mesquite tree control. Land managers use a specially designed deep-grubbing blade on a bulldozer or a track-hoe to remove the tree and root crown 20 to 25 cm below the soil, which is particularly effective. Afterwards, the rough ground needs are addressed, the pasture is re-seeded and spot application of herbicide on the regrowth and new seedlings is applied (Lyon, personal communication). Ill-timed or half-hearted mechanical removal of the trees just the above ground portion routinely leads to increased sprouting and increased density of the tree. Moreover, cuts must be made below the crown to ensure no resprouting. Newly sprouted seedlings can be killed if they are mowed off below the cotyledons, located approximately 2.54 and 3.81 cm above the ground. Optimal timing of mowing is between early spring and late fall when seeds typically sprout ([6]).

Another method of reduction tested include competitive inhibition from grass roots as means to control mesquite growth ([36], [42]). Light levels of either low light level (6.0 ± 0.4% µmol [photon] m-2 s-1 at the soil level and 8.3± 1.9% µmol [photon] m-2 s-1 above the canopy) or high light level (18.9 ± 0.8% µmol [photon] m-2 s-1 at the soil level and 15.0± 1.1% µmol [photon] m-2 s-1 above the canopy), grass root exclusion to 0.15 m depth with 0.15 m diameter, and a control were tested. Perennial grass, a C4, Bothriochloa ischaemum (L.) Keng, var. songarica (Rupr.), was used to impede the propagation of mesquite trees based on the hypothesis that the test grasses would more effectively compete for soil moisture. For the control, the soil moisture was reduced by about 3% from the original range of soil moistures of 28.4% to 27.4% down to 25.3% to 23.9% without grass. This reduction in soil moisture was accomplished by the use of canopies over the soil plots. This depression in soil moisture did not reduce the sprouting of mesquite seedlings nor did it inhibit the establishment of mesquite growth, but it did retard the growth of developing mesquite trees.

The CO2 effects on soil moisture were explored by enclosing a grassland plot 20 m from the other testing sites present in the study. The enclosed plot was exposed to a constant and uniform gradient of 550 µmol mol-1 CO2 concentration in two parallel, tunnel-shaped chambers, running from a north to south axis based on a previous field study ([36]). The competitive grasses only reduced the number of seedlings that emerged, but the grass roots were not sufficiently competitive in restricting soil moisture to prevent the growth of mesquite. Finally, increased CO2 atmospheric gas would only lead to further propagation of mesquite trees ([36]). Moreover, the increased soil-water level allowed for further propagation of mesquite trees.


Controlled burning has been identified as probably the most cost-effective method of mesquite removal ([54]). Mature Prosopis glandulosa are fire-resistant, but the seedlings are more susceptible to damage by fire; therefore, properly timed fires can lead to a complete eradication of the mesquite seedlings in an area. A recent study demonstrated that timing and intensity of fires were important to control P. glandulosa ([8]). Two plots of land were created with acid-scarified mesquite seeds planted in either mid-grass or tall-grass plots. The fields were then burned in either winter, when the seedlings were 10 or 22 months old, or late summer when they were about 17 months old. About 85% of the 17-month-old seedlings were destroyed in the summer burning compared to only 35% of the 10-month-old seedlings’ being destroyed in the winter fires. Summer fires on land with low-grass cover were adequate to destroy mesquite seedlings. Therefore, the evidence suggested ranchers do not need to continue the current practice of deferred grazing to increase the grass biomass with the intent of building adequate burning foliage for winter fires.


Topical and/or root applications of herbicides are not able to achieve a 100% kill rate of mesquite trees, and, furthermore, moderate herbicide injury can lead to increased sprouting of the trees ([6]). Herbicides have been heavily used to combat mesquite propagation; however, herbicides have proven ineffective as the complete solution to the mesquite problem ([14]). Furthermore, lands treated in the 1970’s and 1980’s by two treatments: (1) top-kill herbicides, and (2) root-kill herbicides, and a control were analyzed for cost-efficiency in treating mesquite trees ([5]). The cost of using Triclopyr (3.4.6-trichloro-2-pyridinyloxyacetic acid, butoxyethyl ester), a top-kill herbicide alone, at an application rate of 0.56 kg ha-1 was reported to cost be 37 US $ ha-1, while the cost of using a mixture of 0.28 kg ha-1 Clopyralid, a root-kill herbicide, (3.6-dichloro-2-pyridinecarboxylic acid, monoethanolamine salt) plus 0.28 kg ha-1 Triclopyr was approximately $62 ha-1. Effective root-killing treatments cost between 60 and 70 US $ ha-1 and must be continued for as long as 20 years, and top-killing treatments at 30 US $ to 40 US $ ha-1 need to be continued for more than 10 years to achieve cost-effective results ([54]). Only the root-killing herbicide regime gave an economic return, while top-killing herbicide treatment did not, analyzed on annual grass yields between 1998 and 2000. In addition, variation in increased grass yield from year to year made it difficult to determine which type of grass is better suited to compete or co-occupy land with mesquite. However, Buffalo grass (Buchloe dactyloides) was concluded to have the highest growth rate and to be the best competitor to mesquite regrowth ([5]).

Alternative chemical treatments that allow treated mesquite lands to be used for multi-uses such as livestock production and wildlife habitat have been investigated ([6]). Three different treatments by aerial spray: (1) untreated, (2) Clopyralid alone at 0.28 kg ha-1 and (3) 1:1 mixture of Clopyralid + Triclopyr at 0.28 +0.28 kg ha-1 were applied on two separate plots that were 80 km apart. Each treatment was replicated four times. The highest root kill rate using Clopyralid and Triclopyr was 56.7% with a standard error of 5.8%, further substantiating that herbicides alone are not a final solution. On the other hand, the data demonstrated that herbicides can be used to manage the brush in a savannah ecosystem which appeals to modern management goals in maintaining diversity and creating multiple use options of rangelands ([18], [30]). The authors attribute the variability to the difference in soil composition and vegetation surrounding the mesquite trees on the two separate plots.

Biological control

The use of biological control agents, such as plant eating insects, was suggested as a low-cost method to control the growth of mesquite ([22]). Over 300 insect species have been identified in Argentina and Paraguay that feed on the 30 different Prosopis species. The 10 most effective insect species identified were seed-feeding bruchid beetles belonging to the genera Rhipibruchus, Scutobruchus, Pectinibruchus, and Acanthoscedlides. These insects feed on the developing seeds of the mesquite, thus limiting and controlling the spread of mesquite trees. Other insects including gelechiid leaf-tier from the Evippe and the Recurvaria-Aristotelia group were identified as insects that fed on the mesquite’s foliage. However, non-native insects as biological control agents for mesquite have never been cleared for introduction in the USA.

Biological controls were used in other countries for various Prosopis spp. with mixed results ([58], [33], [48]). For example, Van Klinken et al. ([58]) evaluated the potential effects of Evippe and Prosopidopsylla flava, biological control agents from Argentina, in a study performed in Australia. Evippe flourish in the Australian climate, but the researchers were unable to predict how the insects’ defoliation efforts affected the developmental rates, survival or reduction of mesquite trees. Moreover, despite the Prosopidopsylla flava’s coming from the same region in Argentina as the Evippe, Prosopidopsylla flava failed to achieve the population density to make a substantial impact on the mesquite trees ([58])

Estimation tools

Innovation with brush management allows for more precise control of growth of Prosopis spp. Researchers combined the National Agricultural Imagery Program (NAIP) and a moderate-resolution (30m) Landsat-5 Thematic Mapper (TM) imagery to create free-of-charge maps that can be used by land managers to increase cost-effective methods of monitoring and controlling mesquite growth ([21]). The maps help the land owner decide where efforts need to be allocated to best manage the land and focus resources on key-targeted areas. In addition, The Texas Extension Service also has a tool to help estimate the economic cost of mesquite tree removal through various methods ([55]). This tool gives a rough estimate of the cost associated with mechanical or chemical removal of mesquite depending on the density of the mesquite trees and the location of the area to be cleared. For example, when land managers rent equipment for mechanical removal or contract chemical spraying companies, they can use the tool to: (1) estimate how many mesquite trees need to be removed to make their work economically impactful, and (2) where they should concentrate their efforts based on digital imaging of the coverage of mesquite trees on their property.

  Alternative applications of mesquite 


There is a developing trend to find economically viable uses for harvested mesquite trees and seeds to put sustained pressure on the ecosystem that will limit and ultimately reduce the negative impact from these invasive trees ([48]). A review by Felker et al. ([28]) investigated the genus Prosopis, describing potential food applications which are similar to the food applications of the carob tree (Ceratonia siliqua) cultivated in Spain. Spain is the largest exporter of carob (the fruit pod from Ceratonia siliqua) at 26.185 tons year-1 ([26]). Carob can be formed into a powder that is used as a chocolate substitute, a caffeine-free coffee substitute, and a gum similar to gum arabic ([12]).

Most of the Prosopis pods are from wild sources that are picked by hand with little automation. The pods are screened and then ground and sieved until the correct particle size is obtained for various products (Felker, personal communications). Studies on human food products sourced from the P. glandulosa are limited because of the high labor cost associated with harvesting the pods and the lack of established markets. See examples of different Prosopis pods in Fig. 2.

Fig. 2 - Prosopis pods of various species and origins. (A): screwbean from California, USA, P. pubescens; (B): mesquite from California, USA, P. glandulosa var. torreyana; (C): itin from Argentina, P. kuntzei; (D): mesquite from Baja California, Mexico, P. articulata; (E): algarrobo from Catamarca, Argentina, P. flexuosa; (F): algarrobo negro from Argentina, P. nigra; (G): algarrobo blanco from Santiago del Estero, Argentina, P. alba; (H): mesquite from New Mexico, USA, P. glandulosa var. glandulosa; (I): tamarugo from the Atacama Desert, Chile, P. tamarugo; (J): mesquite from south Texas, USA, P. glandulosa var. glandulosa; (K): mesquite from Senegal, Africa, P. juliflora (from [28] - © reprinted by permission of Taylor & Francis Ltd).

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While pods are a direct food from mesquite trees, an indirect food created by the mesquite trees is honey. Mesquite trees are a rich and popular source of nectar for honey bee production ([22]). Mesquite honey, currently imported from Mexico into the USA, costs approximately 7.93 US $ kg-1 ([2]). Mesquite honey can also be found in the USA, but USA mesquite honey is not tracked by the USDA’s national honey report. In 2015, the economic value of honey produced in the USA was an estimated 327 million US $ ([40]). The USA market demand for honey may increase the economic value of mature mesquite trees used by bees to produce honey in the USA, thus improving rancher land management returns. Bee foraging was measured to understand flowering and pod production of the P. glandulosa var. glandulosa in relation to honeybee pollination. The increased number of pods from the tree had an association with increased number of visitation by bees regardless of the nectar production ([37]).

Most mesquite trees in Peru are used as a source of fuel to cook meats similarly to the use of mesquite in the USA for barbeques. However, unlike the USA, Peru does not view its species of mesquite as a noxious weed and is not seeking to eradicate it. The Peruvian Prosopis pallida has been investigated by the experiment station of the University of Piura (Peru) since 1984, seeking to develop value-added products from the tree’s fruit pods in lieu of using the tree as fire wood. Products developed from the mesquite pods include gluten-free flour, caffeine-free coffee bean substitutes, and a syrup called algarrobina ([32]). Algarrobina is similar in appearance to molasses and is found to have a high sugar content up to 50% of algarrobina and a fiber content up to 32% of algarrobina ([15]). Peruvian products, including the flour and algarrobina, have received USDA certified organic status in the USA. However, the algarroba products (which includes those from both Ceratonia siliqua and Prosopis species) are still an emerging industry and are yet to gain a large foothold in the international market ([26]).

A gluten-free flour made from the seeds of another heavily studied species, Prosopis alba, has a unique flavor and aroma ([53]). The mesquite flour was determined to contain 2.5-dimethyl-3-ethylpyrazine (4.8% of the total volatiles), which has a pleasant cocoa, chocolate, burnt almond and filbert-hazelnut aroma with a low odor of threshold of 0.4 ppb. In addition, (y)-octalactone (0.4%) and (y)-nonalactone (1.6%) lend a coconut aroma ([28]). The chemical and nutritional properties of different fractions of Prosopis alba pods and seeds has also been studied ([47]). The whole seed contained 34% protein, while the whole pod flour contained 5.8% protein, and the pulp (pericarp) flour contained 3.5% protein. In addition, the whole pod flour was found to have 44% sucrose compared to 41% sucrose in pulp flour. Another highlight of the analysis was iron content was approximately 57 ppm in pods and approximately 54 ppm in pulp flour, which could supplement a person’s diet to meet the recommended daily intake of iron. Soluble dietary fiber was reported on a dry weight base as approximately 25% for pod flour total dietary fiber (84% of it being insoluble dietary fiber), while pulp flour was reported as about 23% total dietary fiber (95% of it being insoluble fiber). Because the flour is gluten-free, the flour could be used in bakery formulations for the large and growing gluten-free bakery goods market ([47]).

In addition, the gum made from the Prosopis spp. is comparable in functionality to other gums such as gum arabic ([38]). Mesquite pod gum can be used as an emulsifying and stabilizing ingredient. The greatest difference between the Prosopis alba (mesquite) gum and the gum arabic (Acacia senegal) is the mesquite’s higher protein content ([59]). The researchers documented that the mesquite gum was able to better reduce interfacial tension compared to gum arabic measured by interfacial tension oil-in-water emulsion interfaces. In addition, the volume droplet size distribution for emulsions containing 2% of mesquite gum had monomodal distribution of 0.7 to 60 µm, while gum arabic has a much broader range of droplets, 0.7 to 200 µm, suggesting mesquite gum is a more consistent emulsifier than gum arabic. The mesquite gum’s improved interfacial and emulsifying properties are attributed to the mesquite gum’s higher protein content ([23], [43], [46]).


A publication of the Texas Forest Service ([44]) compared the properties of Prosopis glandulosa var. glandulosa to other woods. The mesquite lumber was superior to almost all of the other woods in every category except for bending strength (Tab. 1). The mesquite ranks the lowest in volumetric shrinkage, about one-fourth that of other woods. The low volumetric shrinkage in mesquite woods is desirable as long as the shrinkage remain uniform within the wood. In addition, its radial and tangential shrinkage are almost equal, which reduces stress on the wood during high moisture building, i.e., seasonal weather changes. No other wood compared during the test exhibited these same properties. However, one disadvantage explained by the author is mesquite wood can have a high variation in density, bending strength, volumetric shrinkage and radial shrinkage (Tab. 1 and Tab. 2). The properties can have more than 300% variation in the volumetric trait of the wood, but overall, the volume shrinkage is still lower than any other wood ([44]). To maximize the trees used for lumber from P. glandulosa var. glandulosa, Felker et al. ([27]) calculated 100 stems ha-1 would generate the optimal base diameter of the mesquite tree in 35 cm, to yield the most lumber. The calculated optimal spacing of 10 × 10 m was later confirmed in a follow up study ([41]). In addition, the optimal basal diameter growth of 1.2 cm-1 yr-1 was obtained when disking and pruning treatments were applied to the mesquite tree grove over 9 years.

Tab. 1 - Selected physical and mechanical properties of mesquite (Prosopis glandulosa var. glandulosa) and various other fine woods (commonly used values - [44]). (1): Prosopis glandulosa var. glandulosa; (2): Quercus falcate Michx.; (3): Carya tomentosa Nutt.; (4): Carya illinoinensis (Wangenh.) K. Kock; (5): Pinus taeda L.; (6): Acer saccharum Marsh.; (7): Populus deltoides Bartr.; (*): MOE - modulus of elasticity; (**): Unitless.

Property Mesquite1 Southern2
Red Oak
Mockernut3 Hickory Pecan4 Loblolly5 Pine Sugar6 Maple Eastern Cottonwoood7
Density (kg m-3) 721 589 719 660 509 630 449
Bending Strength MOE* ( kPA) 9515 10273 15306 11928 12342 12617 8963
Volumetric Shrinkage (%) 4.7 16.1 17.8 13.6 12.3 14.7 13.9
Radial/Tangential Shrinkage** 2.2/2.6 4.7/11.3 7.7/11.0 4.9/8.0 4.8/7.4 4.8/9.9 3.9/9.2
Side hardness (kg) 1060 481 1089 826 313 658 195

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Tab. 2 - The variation in the physical and mechanical properties of mesquite wood (Prosopis glandulosa var. glandulosa) as tested by the Texas Forest Products Laboratory over a 15-year period ([44]). (*): MOE, modulus of elasticity.

Property Lowest Highest Published
Deviation (%)
Density (kg m-3) 639 987 721 54.4
Bending Strength MOE* (kPA) 4220 9935 9515 136
Volumetric Shrinkage (%) 1.8 7.5 4.7 316.7
Side hardness (kg) 549 1365 1060 149

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Hardwood sawn timber has historically garnered higher prices than pulpwood with an average of 20.40 US $ ton-1 ([1]). In the TimberMart South, second quarter report of 2016, mesquite pulpwood averaged around 10 US $ ton-1 and sawn timber averaged 25 US $ ton-1 ([56]). Since mesquite is not harvested on a large commercial scale within the USA, reports will show mesquite wood mixed with other hardwoods. For example, the hardwood pricing publication Hardwood Review Global did not report a specific cost for mesquite, while reporting many others like cottonwood, cherry, hard maple, hickory, red oak, white oak, and walnut ([34]).

Moreover, through efforts to understand the mesquite lumber market, communication from the College Station Cooperative Extension office reported that a St. Angelo, TX, company is harvesting mesquite - grinding, pelletizing and shipping it overseas for pellet stoves. In addition, another land owner cut and sold the mesquite wood he grubbed from his land as firewood. His sales of firewood paid for most of his removal cost. He also stated that land owners must do yearly follow-up to maintain control of the mesquite regrowth (Lyon, personal communications).


Crop residues, forest residues, grasses, and woody species may be used as lignocellulosic biomass to produce second generation biofuels. Reduction of greenhouse gas relative to petroleum gasoline was reported to be 19-48%, 40-62%, 90-103%, 77-97% and 101-155% from corn ethanol, sugarcane, corn stover, switch grass and Miscanthus spp. grass, respectively ([61]). Ansley et al. ([7]) analyzed mesquite’s potential use as a biofuel and found not only would harvesting mesquite be economically feasible and sustainable, it also would yield other ecosystem benefits, including increased grass and foliage production for livestock foraging. The approach to control mesquite through biofuel production could benefit both the rancher and the green energy producer.

Moreover, the economic and greenhouse gas impact of Prosopis glandulosa was assessed over the southern great plains (SGP) of the USA ([62]). Researchers wanted to look at new sources of biofuel that could replace grain-based biofuels. The assessment compared mesquite against other regional bioenergy feedstock in the SGP and demonstrated that mesquite was better than all other feed stocks in sequestering greenhouse gases, offsetting inefficiency, and increasing greenhouse gas use efficiency when land use change is considered. At a total cost of about 121 US $ ha-1, the mesquite was found to produce energy levels of 43.34 GJ ha-1 (Tab. 3). Regrowth of the mesquite trees occurs in about half the time to grow a tree from seed ([7]). This leads to obvious problems for land management as evidenced by the continuing reinvasion of range land by mesquite trees; however, the mesquite tree’s ability to regenerate quickly makes it an ideal candidate for biofuel as biomass material.

Tab. 3 - A comparison of the sweet sorghum, switchgrass, and mesquite production systems ([62]).

Item Sweet Sorghum Switchgrass Mesquite
Irrigated Dryland
Total cost (ha -1 $US) 1745.47 748.83 519.68 121.41
Biomass (Mg ha-1) 17.79 6.93 12 2.2
Energy content (GJ ha-1) 410 166 189.6 43.34
Greenhouse gas emission 1256 439.4 354.09 108.52
Greenhouse gas offset 7455 2904 4050 1100
Net Greenhouse gas offset (without land use change effect) 6199 2464.6 3695.91 991.48
Greenhouse offset of alternative crop 3370 1500 1500 -
GHG offset (with land use change effect) 4085 1404 2550 1100
Net GHG offset (with land use change effect) 2829 964.6 2195.91 991.48
Cost/biomass ($ US/Mg) 98.115 108.056 43.307 55.186
Cost/energy ($ US/GJ) 4.257 4.511 2.741 2.801
Cost/NGO ($ US/Carbon equivalent, without land use change effect) 0.282 0.304 0.141 0.122
Cost/NGO ($ US/Carbon equivalent, with land use effect) 0.617 0.776 0.237 0.122
Green house gas efficiency (without land use change effect) 5.936 6.609 11.438 10.136
Green house gas efficiency (with land use change effect) 3.252 3.195 7.202 10.136

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The biomass needs of Prosopis glandulosa for gasification amounts and processes have been quantified ([19]). A small-scale biomass energy conversion plant was created to use brush material such as mesquite or redberry juniper (Juniperus pinchotii) as fuel in a small-scale (10kW) batch-type, fixed-bed gasifier. The effects of equivalence ratio, particle size, moisture content on the temperature profile, gas composition, and higher heating value (HHV) of both mesquite and redberry juniper wood were analyzed. When N2 was removed, the HHV of the gas end product of the mesquite and redberry juniper wood was 26% and 27.5%, respectively, with the equivalence ratio being 2.7. In a follow up study, they looked at the tar formation and yield from gasification of mesquite and juniper wood in an updraft gasifier. Mesquite wood energy yield was found to be up to 3.5 MJ kg-1 when the moisture of the wood was at an ideal 6%. In a follow up study, the gas yield formation from the mesquite ranged from 0.51 to 0.31 per unit mesquite in the gasification process ([20]).

Similar biofuel research on mesquite has been conducted in Turkey. Syrian mesquite (P. farcta) was investigated in Turkey for bio-oil production via catalytic supercritical liquefaction ([10]). P. farcta was used in a catalytic reaction using ZnCl2 and NaOH. Acetone was held at 295 °C, which achieved a liquid yield of 49.7%, indicating that most of the biomass was recovered as bio-oil, with HHV between 20 and 34 MJ kg-1.


Mesquite wood chips have also been tested as an organic filter material (OFM). An OFM is an organic material that retains different pollutants that later biodegrades into to CO2, H2O, and N2. An OFM can be used as a bio-filter over an organic bed system, serving as a decentralization technology alternative to conventional municipal wastewater treatment ([51]). This research investigated mesquite wood chips as an organic filter material that met both Mexico’s and USA’s regulations for reuse in irrigation. The optimal hydraulic loading rate over 200 days of testing was 1.07 m3 m-2 d-1. This resulted in a removal efficiency of biochemical oxygen demand by 92%; and a reduction of the chemical oxygen demand by 78%. The total suspended solids were reduced by 95% and there was a four-log reduction of fecal coliforms. These reported variables contributed to a mesquite wood chip OFM’s meeting the critical requirements of waste water treatment for reuse in irrigation set by the USA and Mexican governments. Thus, the novel use of mesquite wood as a bio-filter was deemed viable.

Human challenges to control

Discussed throughout this paper are different options available for the uses of mesquite. However, the viewpoint of the very small land owner who may rely upon mesquite for his/her livelihood should not be overlooked. Farmers in South Africa will serve as example to illustrate this point. Shackleton et al. ([49]) investigated different stakeholder viewpoints in South Africa: farmers, urban-informal, urban-affluent, and communal areas. All considered the costs of Prosopis to be greater than the benefits. However, even when they understood the invasive nature of Prosopis, approximately 63% of farmers continued to use the Prosopis’ pods as fodder for their livestock. Two other common uses of Prosopis were fuelwood and shade. Thus, these applications may continue to make livestock owners more dependent on Prosopis products and lead to their resistance to control. In addition, governments and NGOs may promote utilization as a means of mesquite control even though utilization of mesquite alone has been proven insufficient to contain the problem of mesquite’s rapid growth. Both of these efforts may lead to ongoing invasions. When the intent is unambiguously to restore invaded areas to productivity, then alternate uses can be a way of offsetting the control costs. Furthermore, the economic cost to run an efficient land management program is a barrier: the estimated control cost for appropriate mesquite management (> 9.5 million US $ yr-1) far surpasses the entire budget of the Public Work programs of South Africa ([64]).


The applications for mesquite trees and their products are nearly limitless, but how to manage mesquite tree’s invasion of lands still eludes researchers and government agencies alike. Mesquite tress were once heralded as the salvation of arid land as result of the Prosopis species’ ability to fix nitrogen, enriching the soil; however, governments latter realized the water demand of mesquite tree outweighed its benefits. The uses of mesquites trees included food for human or animal consumption, lumber, biofuel, and an emerging application as an organic bio-filter. Land managers have tried to control mesquite growth through mechanical, burning, herbicides and biological control methods. However, humans mixed relationships with mesquite uses from different economical functions in society compound the problem to effectively control mesquite afflicted lands. As discussed in this article, many years of research have been spent on unlocking the uses of mesquite trees. However, the growing problem of mesquite land management still provides a rich opportunity for continual research into new ways to utilize mesquite lumber and seed pods in an environmental and economical sustainable manner.


Dr. Peter Felker provided valuable insight from his past work when contacted for this paper. Funding from a USDA SBIR project is appreciated.


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Authors’ Affiliation

Seth W Ellsworth
Philip G Crandall
University of Arkansas, Fayetteville, Arkansas (USA)
Philip G Crandall
Jody M Lingbeck
Corliss A O’Bryan
New Organic Solutions, LLC, New Orleans, Lousiana (USA)

Corresponding author

Seth W Ellsworth


Ellsworth SW, Crandall PG, Lingbeck JM, O’Bryan CA (2018). Perspective on the control of invasive mesquite trees and possible alternative uses. iForest 11: 577-585. - doi: 10.3832/ifor2456-011

Academic Editor

Michele Carbognani

Paper history

Received: Apr 06, 2017
Accepted: Jul 10, 2018

First online: Sep 25, 2018
Publication Date: Oct 31, 2018
Publication Time: 2.57 months

© SISEF - The Italian Society of Silviculture and Forest Ecology 2018

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