Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Effects of drought and heat on forest insect populations in relation to the 2003 drought in Western Europe. | Ann. For. Sci. 63 2006 613-624 INRA EDP Sciences 2006 DOI forest 2006044 613 Review Effects of drought and heat on forest insect populations in relation to the 2003 drought in Western Europe Gaelle R0UAULTa Jean-Noel Candau Francois LlEUTlERb Louis-Michel Nageleisenc Jean-Claude MARTlNa Nathalie WarzEEd a Unité de Recherches Forestières Méditerranéennes INRA Domaine St-Paul Site Agroparc 84914 Avignon Cedex 9 France b Université d Orléans Rue de Chartres BP 6759 45067 Orléans Cedex France c Ministère de l agriculture de l alimentation de la pêche et des affaires rurales Département de la Santé des Forets Centre INRA de Nancy 54280 Champenoux France d Lutte biologique et Écologie spatiale LUBIES CP 160 12 Université Libre de Bruxelles 50 avenue FD Roosevelt 1050 Bruxelles Belgium Received 14 January 2006 accepted 21 June 2006 Abstract - Although drought affects directly tree physiology and growth the impact of secondary factors insect pests pathogens and fire is often greater than the impact of the original stress and can lead to important tree mortality. In 2003 Western and Central Europe experienced a drought and heat waves that led to extensive forest damage. This paper reports on the impacts of drought and high temperatures on forest insect populations in the context of this exceptional event. Observations of changes in population levels of the main European forest insect pests during and after the drought are presented and discussed in the light of current knowledge and theories of interactions between drought and insects. We investigated the direct effects of drought on life history traits and indirect effects through physiological changes experienced by host trees. Forest pest insects were separated in 4 feeding guilds woodborers leaf-chewers leaf-miners and leaf-suckers. The impact of water stress varied according to feeding guilds. Woodborers were positively influenced by prolonged water stress and the decline of host resistance. In contrast .
