TAILIEUCHUNG - Báo cáo khao học: "Positive effect of drought on longicorn borer larval survival and growth on eucalyptus trunks"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Positive effect of drought on longicorn borer larval survival and growth on eucalyptus trunks. | Ann. For. Sci. 59 2002 99-106 INRA EDP Sciences 2002 DOI forest 2001009 99 Original article Positive effect of drought on longicorn borer larval survival and growth on eucalyptus trunks Maria da Conceiẹão Caldeira Vicente Fernandez José Tomé and João S. Pereira Departmento de Engenharia Florestal Instituto Superior de Agronomia Tapada da Ajuda 1349-017 Lisboa Codex Portugal Received 1st December 2000 accepted 28 March 2001 Abstract- Phoracantha semipunctata F. larvae attack and kill trees in Eucalyptus globulus Labill. plantations in Mediterranean countries. To test the hypothesis that these attacks are more likely in arid environments we examined the effects of water deficits in the host trees of E. globulus on the mortality and growth of P. semipunctata larvae. Trees subjected to water stress during two subsequent years were compared with rainfed and irrigated trees. Larvae of P. semipunctata were artificially introduced in the bark of trees of either treatment. Larvae mortality was lower and weight gain was higher in water stressed trees than on rainfed trees. There was no larvae survival in irrigated trees. These results were related to changes in moisture content and concentration of soluble sugars in the bark of the trees. The results of this study suggest that water stress had a major role on the survival and growth of the larvae. Cerambycidae Phoracantha semipunctata plant-insect interaction water-deficit bark borer Résumé - Effets positifs de la sécheresse du sol sur la survie et la croissance des larves de Phoracantha semipunctata sur l eucalyptus. Le Phoracantha semipunctata F. Coleoptera Cerambycidae est un ravageur commun des plantations d Eucalyptus globulus Labill. des milieux méditerranéens particulièrement dans les regions les plus arides. La mortalité et la croissance des larves de P. semipunctata ont été comparées in vivo sur des arbres d E. globulus soumis à trois traitements stress hydrique durant deux années consécutives irrigation et

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