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Forestry 1997 70(2):129-137; doi:10.1093/forestry/70.2.129
© 1997 by Institute of Chartered Foresters
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Forest characteristics affecting the rate of shoot pruning by the pine shoot beetle (Tomicuspiniperda L.) in Pinus radiata D. Don and P. sylvestris L. plantations

I. AMEZAGA *

Department of Pure and Applied Biology, Imperial College at Silwood Park Ascot, SL5 7PY, England

Different variables, such as altitude and presence of defoliators, were studied in Bizkaia (northern Spain) in order to assess the susceptibility of Pinus radiata (D. Don) and P. sylvestris (L.) stands to Tomicus piniperda (L.) (Coleoptera: Scolytidae). Altitudes higher than 400 m, presence of logs, degree of thinning and incidence of fires, all increased the susceptibility of P. radiata monocultures to shoot attack by T. piniperda. P. sylvestris plantations were more affected at alti tudes lower than 400 m and by poor forest hygiene. The presence of the processionary moth (Thaumetopoea pityocampa Den and Schiff.) had a significant effect on the rate of shoot pruning on the trees; vigorous trees and those with bare leader were more affected by the bark beetle attack if T. pityocampa larvae were feeding on their needles, while trees with dominance taken by the side shoots were less attacked when moth larvae were present.

Received 17 June 1996.
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