豚草卷蛾在广西来宾建群状况及其对作物的安全性调查

【背景】豚草于20世纪80年代入侵广西省来宾市兴宾区，现已扩散至该区的部分乡（镇），2009年5月通过在广西来宾市高岭村释放广聚萤叶甲和豚草卷蛾防治豚草，3个月后释放点豚草的死亡率达98％以上。【方法】实地调查豚草卷蛾的扩散、建群情况和对当地作物的安全性。【结果】豚草卷蛾在来宾市已形成稳定种群。豚草卷蛾在对豚草的控制过程中，能在豚草生长区迅速定殖、建群，在定殖区豚草被完全控制或呈现零星分布后，该虫又会迅速向邻近成片生长的豚草区扩散、定殖。在调查中未发现豚草卷蛾对周边农作物产生为害。【结论与意义】豚草卷蛾对作物安全，可以在广西大范围释放。

Population status of the biological control agent Epiblema strenuana （Lepidoptera： Tortricidae） in Laibin, Guangxi Province, China

Background] Ragweed, Ambrosia artemisiifolia invaded Laibin, Guangxi Province in the 1980s and has spread to several parts of the township. In order to control its invasion, the tortricid Epiblema strenuana was released in Gaoling village, Laibin, Guangxi, on 24 May 2009. After three months, the control effect was up to 98%. Method] We performed a region-wide survey on the population status of E. strenuana and the safety for other crops. Result] E. strenuana established a stable population in Laibin. When the host plants in the original introduction area were all consumed, E. strenuana rapidly spread to adjacent areas invaded by A. artemisiifolia. During the survey, we did not found E. strenuana infestation on any surrounding crops. Conclusion and signifi- cance ] E. strenuana had a significant control effect on A. artemisiifolia and seems safe for cultivated crops, so the species seems suit- able for wider release in Guangxi Province. However, migration and formation of stable populations by E. strenuana were not as fast as of its host plant, A. artemisiifolia, so we need to assist the migration of the biocontrol agent in order to control A. artemisiifolia.