林间释放花绒寄甲对松褐天牛防效的研究

摘要

通过林间释放花绒寄甲成虫寄生诱木内的越冬代松褐天牛,研究该天敌对松褐天牛的防治效果.结果显示,3月分别在庐山、新干和全南释放花绒寄甲成虫,防治松褐天牛效果随着纬度降低而显著降低.3月、4月和5月在新干释放该天敌,防治效果随着时间推移而显著降低.林间大面积释放花绒寄甲,以释放量为3000头/hm2的样地对松褐天牛的防治效果最好(达79.43%).这些研究结果说明:利用花绒寄甲防治松褐天牛具有良好的控制效果,可以在生产中推广应用;江西中部地区释放花绒寄甲成虫的最佳时间在3月上旬,偏南、偏北地区相应提前或推后约10 d.%To evaluate the control effects of Dastarcus helophoroides on Monochamus alternatus,D. helopho-roides adults were released on the overwintering M. alternatus larvae and pupae of the infested pine logs in for-ests.In the first set of field experiments,the adults were released in April in the forests of Lushan,Xingan and Quannan County,respectively,there were significant differences among the controlling effects on M. alternatus, and the lower the latitude,the worse the effects. In the second,when adults were released in March,April and May in Xingan County,there were also significant differences among those as above,and the later the adult-relea-sing time,the worse the effects.In the third,when mass releasing of adults at the quantity of 3000 per hm2 into a pine forest in Xingan County,the controlling effect was as high as 79.43%.The results revealed that releasing D. helophoroides adults is considerably effective to reduce the M. alternatus Populations, but the adult releasing should be carried out in early March in the middle of Jiangxi Province,and earlier than that in the south.