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Impact of sawfly defoliation on growth of Scots pine Pinus sylvestris (Pinaceae) and associated economic losses

Published online by Cambridge University Press:  09 March 2007

P. Lyytikäinen-Saarenmaa  and
E. Tomppo
P. Lyytikäinen-Saarenmaa*
Affiliation:
Faculty of Forestry, University of Joensuu, PO Box 111, FIN-80101 Joensuu, Finland
E. Tomppo
Affiliation:
Finnish Forest Research Institute, National Forest Inventory, Unioninkatu 40 A, FIN-00170 Helsinki, Finland
*
*Fax: +358 013 2514444 E-mail: Paivi.Lyytikainen-Saarenmaa@joensuu.fi
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Abstract

Needle defoliation by diprionid sawflies decreases the increment and timber yield of Scots pine Pinus sylvestris L. The aim of this study was to provide approximate estimates of this decrease and preliminary estimates of the economic value of growth losses and tree mortality. Growth loss after needle damage by Diprion pini(Linnaeus) was studied in western Finland. Increment cores were sampled for radial growth measurements from trees subjected to slight, moderate and heavy defoliation. A literature survey was carried out to estimate radial growth losses after defoliation by Neodiprion sertifer (Geoffroy). Calculations for economic consequences were based on previous estimates and on the ongoing 9th Finnish National Forest Inventory. Moderate defoliation by N. sertifer and D. pini reduced volume growth by 21% and 86% and heavy defoliation by 38% and 94%, respectively. Tree mortality in defoliated stands was recorded as approximately 4%after an outbreak of N. sertifer and 30% after an outbreak of D. pini. The estimated average economic value of the losses due to reduced growth and tree mortality reached $40 ha−1 after a single-year outbreak of N. sertifer and $310 ha−1 in the case of D. pini. These preliminary estimates of economic losses indicate a much higher impact of pine sawflies than those revealed by the few earlier studies in Europe.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 92 , Issue 2 , April 2002 , pp. 137 - 140
Copyright
Copyright © Cambridge University Press 2002

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