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Pine growth response to processionary moth defoliation across a 40-year chronosequence


Jacquet, JS and Bosc, A and O'Grady, AP and Jactel, H, Pine growth response to processionary moth defoliation across a 40-year chronosequence, Forest Ecology and Management, 293 pp. 29-38. ISSN 0378-1127 (2013) [Refereed Article]

Copyright Statement

Copyright 2012 Elsevier B.V.

DOI: doi:10.1016/j.foreco.2012.12.003


Estimating the impact of pest insects on forest productivity requires a better understanding of host tree responses. While many studies have focused on juvenile trees, studying the impacts of defoliation on trees of increasing age helps to better characterize underlying mechanisms regulating growth responses to defoliation. During winter 20092010 a large outbreak of pine processionary moth occurred in Southwestern France. We established a field experiment to examine the effects of pine processionary moth defoliation varying from 25% to 100% on the growth of Pinus pinaster in stands ranging from 3 to 40 years old. Our results showed that pine processionary moth defoliation resulted in significant loss of radial growth for at least two years following defoliation. Stem growth loss in the first and second years was proportional to defoliation intensity and ranged from 32% to 93% in year 1, and from 17% to 68% in year 2. Stem growth was most reduced in older trees. Carbohydrates and nitrogen contents in needles and stem sapwood were also affected by defoliation. Our results suggest that defoliation affects stem growth through nitrogen and carbon resource limitation and that stem growth would be a lower priority sink for resources than other physiological processes in pine trees.

Item Details

Item Type:Refereed Article
Keywords:forest productivity, herbivory, age, nutrient, carbon, nitrogen
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Forest health and pathology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Softwood plantations
UTAS Author:O'Grady, AP (Dr Anthony O'Grady)
ID Code:116655
Year Published:2013
Web of Science® Times Cited:33
Deposited By:Plant Science
Deposited On:2017-05-16
Last Modified:2017-09-04

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