广聚萤叶甲和豚草卷蛾对广西来宾豚草的联合控制作用

【背景】豚草已成功入侵广西来宾,对当地生物多样性、农业生产和居民健康造成了严重影响。广聚萤叶甲和豚草卷蛾均为豚草的重要专一性天敌,在湖南等地已有效抑制了豚草的扩散蔓延。【方法】为考查2种天敌在广西对豚草的联合控制作用,于2009年5月24日在广西来宾豚草入侵地区同时释放广聚萤叶甲和豚草卷蛾(2种天敌释放密度均为1170头.hm-2)。【结果】至2009年8月29日释放区内豚草植株死亡率达98%以上,且天敌迅速向邻近豚草发生区扩散,2种天敌对扩散区豚草的控制率可达50%～60%。【结论与意义】2种天敌对豚草具有显著的控制效果,建议在广西大面积推广应用。

Combined control of common ragweed,Ambrosia artemisiifolia with Ophraella communa and Epiblema strenuana in Laibin,Guangxi Province,China

Background]Common ragweed,Ambrosia artemisiifolia has successfully invaded Laibin,Guangxi,and it has impacted significantly local biodiversity,agricultural industry and resident’s health.Both Ophraella communa and Epiblema strenuana are important special natural enemies of A.artemisiifolia,and the two natural enemy species had suppressed the spread of A.artemisiifolia in Hunan Province,etc.Method]In order to explore the combined control effect of O.communa and E.strenuana on A.artemisiifolia,the two natural enemy species were released into the areas invaded by A.artemisiifolia in Laibin,Guangxi,on May 24,2009(densities of the two natural enemy species were 1170 individuals·hm-2).Result]The mortality of A.artemisiifolia plants was up to 98% on August 29,2009,and the two natural enemy species spread to the adjacent areas invaded by A.artemisiifolia rapidly.The effect of the two natural enemy species on A.artemisiifolia was 50%～60% in the spread areas.Conclusion and significance]The two natural enemy species had a significant control effect on A.artemisiifolia,it’s suggested that biological control technique of A.artemisiifolia with O.communa and E.strenuana can be applied in Guangxi Province.