花绒寄甲对柑橘天牛的防控效果

Control effects of Dastarcus helophoroides against longhorn beetles in citrus orchard

天牛是我国重要的柑橘害虫,近年来在老果园发生日趋严重。为有效控制柑橘天牛的发生,在湖南省洪江市和保靖县开展试验,研究花绒寄甲成虫、卵卡及其释放方法对柑橘星天牛和褐天牛的防控效果。结果表明,释放花绒寄甲成虫对星天牛的防控效果显著高于释放花绒寄甲卵卡,4月或9月释放花绒寄甲成虫1头/株,3年后的防控效果均超过了80%,其中在4月释放花绒寄甲成虫3年后的防效显著高于在9月释放;释放花绒寄甲成虫1头/株或2头/株,3年后对褐天牛的防效均超过了90%,但释放花绒寄甲成虫2头/株的防效显著高于1头/株;在4月份释放花绒寄甲成虫对柑橘天牛的持效性较好,而在9月释放花绒寄甲成虫对柑橘天牛的速效性较高,在4月和9月各释放1次花绒寄甲成虫则兼顾了速效性和持效性,综合防效最佳。

The longhorn beetles are important citrus pests in China,and it has been more and more serious in old citrus orchards in recent years.To effectively control these insect pests,the release method of Dastarcus helophoroides and the control effect of releasing D.helophoroides adults and eggs against Anoplophora chinensis and Nadezhdiella cantori were studied respectively in Hongjiang City and Baojing County of Hunan Province.The results showed that the control effect of releasing D.helophoroides adults on A.chinensis was significantly higher than that of using egg cards(p<0.05).Releasing one D.helophoroides adult per plant in April or September resulted in a control efficacy of more than 80%after three years,and the release in April was significantly more effective than the release in September(p<0.05).The control effect of releasing one or two adults of D.helophoroides per plant on N.cantori was more than 90%after three years,the control effect of releasing two adults per plant was significantly higher than that of the one adult per plant treatment(p<0.05).The release of adults in April had better persistence against the longhorn beetles,while the release of the adult in September had better quick-acting effects against the longhorn beetles.In conclusion,releasing D.helophoroides adults once in April and once in September provided both a quick effect and a persistent effect.