iForest - Biogeosciences and Forestry


Effects of defoliation by the pine processionary moth Thaumetopoea pityocampa on biomass growth of young stands of Pinus pinaster in northern Portugal

PS Arnaldo (1-2)   , S Chacim (1), D Lopes (1-2)

iForest - Biogeosciences and Forestry, Volume 3, Issue 6, Pages 159-162 (2010)
doi: https://doi.org/10.3832/ifor0553-003
Published: Nov 15, 2010 - Copyright © 2010 SISEF

Research Articles

Biomass growth models for 13-year-old maritime pine tree stands (Pinus pinaster Ait.) in the north-eastern Portugal were developed and used to analyse the effects of the defoliation by the pine processionary moth, Thaumetopoea pityocampa (Den. & Schiff.) on biomass increment. For the adjustment of the models, 30 individual pine trees were destructively sampled and non-linear models were tested, using the diameter at 10 centimetre height (d0.10), the total height (h), both variables (d0.10+h) and d0.102h as preditors of biomass growth. The results showed that the best predictor was d0.10+h. Application of models to analyse tree biomass after attack by the pine processionary moth showed that the decrease of biomass increment was proportional to the severity of the insect attack, with average values of losses in biomass increment ranging from 37% to 73%, depending on defoliation intensity.


Prediction model, Thaumetopoea pityocampa, Biomass increment, Pinus pinaster

Authors’ address

PS Arnaldo
S Chacim
D Lopes
University of Trás-os-Montes and Alto Douro, Forestry and Landscape Architecture Department, 5001-801 Vila Real (Portugal)
PS Arnaldo
D Lopes
Center for the Research and Technology of Agro-Environmental and Biological Sciences, University of Trás-os-Montes and Alto Douro, 5001-801 Vila Real (Portugal)

Corresponding author

PS Arnaldo


Arnaldo PS, Chacim S, Lopes D (2010). Effects of defoliation by the pine processionary moth Thaumetopoea pityocampa on biomass growth of young stands of Pinus pinaster in northern Portugal. iForest 3: 159-162. - doi: 10.3832/ifor0553-003

Paper history

Received: Jun 07, 2010
Accepted: Oct 23, 2010

First online: Nov 15, 2010
Publication Date: Nov 15, 2010
Publication Time: 0.77 months

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