光肩星天牛对白桦林的危害及药剂防治效果

Infestation of Betula platyphylla by Anoplophora glabripennis and Its Control Using Insecticides

Data from a survey in the Hasi Mountain areas of Jinyuan County in Gansu province of China showed that 83.3% white birch(Betula platyphylla) stand was infested by the Asian longhorned beete,Anoplophroa glabripennis.The longevity of the beetles was(41.2±11.5) days for a male and(39.1±13.1) days for a female when twigs of white birch were used as a sole source of food for the adult beetles.The area of twig barks consumed by a pair of beetles in their life time was(9.93±8.15) cm2.A female can make(12.4±12.1) egg pits in average during the period when they were alive and caged.If removal of the infested tree is used as a management measure,it must be excuted consecutively for two years to be effective.Field tests were conducted in 2005 and 2006 to treat infested trees with imidacloprid through trunk injection,soil injection,and soil drench.The results showed that the number of dead adults under the treated trees was 6.3 times for trunk injection,5.1 times for soil injection,and 4.9 times for soil drench more than that under the untreated control.The number of live larvae decreased by 95.8% for trunk injection,83.3% for soil injection,and 85.5% for soil drench in comparison with larva mortality in control.The number of egg pits made on tree trunks by an adult was decreased by 87.1%、77.4%and 82.6%for imidacloprid trough trunk injection,soil injection,and soil drench,respectively,compared with the untreated control.

Data from a survey in the Hasi Mountain areas of Jinyuan County in Gansu province of China showed that 83.3% white birch （ Betula platyphylla） stand was infested by the Asian longhomed beete, Anoplophroa glabripennis. The longevity of the beetles was （41.2 ＋ 11.5） days for a male and （39.1 ＋ 13.1） days for a female when twigs of white birch were used as a sole source of food for the adult beetles. The area of twig barks consumed by a pair of beetles in their life time was （9.93 ＋ 8.15） cm^2. A female can make （12.4 ＋ 12.1） egg pits in average during the period when they were alive and caged. If removal of the infested tree is used as a management measure,it must be excuted consecutively for two years to be effective. Field tests were conducted in 2005 and 2006 to treat infested trees with imidacloprid through trunk injection, soil injection, and soil drench. The results showed that the number of dead adults under the treated trees was 6.3 times for trunk injection, 5.1 times for soil injection, and 4.9 times for soil drench more than that under the untreated control. The number of live larvae decreased by 95.8% for trunk injection,83.3% for soil injection, and 85.5% for soil drench in comparison with larva mortality in control. The number of egg pits made on tree trunks by an adult was decreased by 87.1% ,77.4% and 82.6% for imidaeloprid trough trunk injection, soil injection, and soil drench, respectively, compared with the untreated control.