红环瓢虫林间应用技术研究

Study on the forest application techniques of Rodolia limbata

红环瓢虫 (Rodolia limbata Motschulsky)是草履蚧 [Drosicha corpulenta (Kuwana) ]的主要捕食性天敌 ,采用在林间小片面积繁育瓢虫种虫 ,采集带种虫的枝条在草履蚧发生区挂放的方法大面积防治草履蚧 ,释放1年后 ,草履蚧的平均虫口密度可控制在 1.2头 / cm2 以下 ,2年后可控制在 0 .0 1头 / cm2 以下 ,达到了持续控制的目的。在防治中必须保证放瓢虫点草履蚧虫口密度大于 0 .2头 / cm2 ,释放量在 10 0头以上 ,最佳防治时期为 4月中旬至

Rodolia limbata is the most important predatory insect of Drosicha corpulenta .The experiment of application of Rodolia limbata for biological control of Drosicha corpulent showed that the control effects was significant.After releasing the breeding ladybirds,the average pest population density was reduced to 1.2/cm 2 in one year and 0.01/cm 2 in two years.In order to succeed in biological control,the pest density must be over 0.2/cm 2 and the numbers of breeding ladybirds over 100, and the optimal application period was from the middle of April to the middle of May.