Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"Application of deltamethrin for spraying or dipping to protect Scots pine seedlings against Hylobius abietis L and logs against Tomicus piniperda L. | Ann Sci For 1991 48 113-117 Elsevier INRA 113 Original article Application of deltamethrin for spraying or dipping to protect Scots pine seedlings against Hyloblụs abietisL and logs against Tomicus piniperda L B Glowacka A Lech w Wilczynski Forest Research Institute Wery-Kostrzewy 2 00-973 Warsaw Box 61 Poland Received 9 January 1990 accepted 28 September 1990 Summary The authors compared the efficiency of protecting Scots pine trees against Hylobius abietis L the large pine weevil using deltamethrin Decis EC by dipping seedlings before planting and by spraying after planting. Assessment of damage caused by the beetles and the rate of degradation of the insecticide on the plants proved that dipped seedlings were less frequently damaged and were protected by 10 times the quantity of active insecticide ingredient than sprayed plants. Experiments were also carried out to analyse the application of deltamethrin in the protection of wood before bark stripping against Tomicus piniperda L the pine-shoot beetle. Treatments were carried out after the last frosts in the early spring and during the first days of swarming. Analysis of infested wood and the degradation of the deltamethrin in the bark showed a high degree of insecticide persistence and thus the possibility of efficient protective treatment 2-3 wk before the swarming period. Hylobius abietis I Tomicus piniperda I Pinus sylvestris I deltamethrin Résumé Application de deltaméthrine pour la protection des jeunes pins Sylvestres contre I hylobe du pin Hylobius abietis L et celle des bois coupés cohtre rhyleslne du pin Tomicus piniperda L. On a compare I efficacitd de la deltaméthrine sur des plants de pin Sylvestre contre I hy-lobe Hylobius abietis L. La deltaméthrine Decis EC a été appliquée par trempage des plants avant la plantation OU pulvérìsée en foret après la plantation. On a ensuite évalué les dégâts causes par les adultes et la degradation dans le temps de I insecticide sur les plants. Les plants .
