编辑同志: 我所在的苗圃有两块前茬为山药(土豆)和甜菜的苗圃地,大黑鳃角金龟甲和金绒金龟甲幼虫危害相当严重,杨树苗绝大部分已经死亡。这种害虫的防治方法虽很多,但由于经济和其他条件的限制,只能采用化学防治。据资料介绍六六六粉处理土壤是防治蛴螬的好方法,但六六六粉在动植物体内易积累,造成慢性中毒,国家限制生产。那么用什么药剂处理土壤,消灭蛴螬既经济又 Editor’s Comrades: My nursery has two nursery fields with yam (potatoes) and sugar beet. The big black gills and the golden cashmere larvae are quite devastating. Most of the poplar has died. Although many pest control methods, but due to economic and other conditions, only chemical control. According to the information on the six six six powder treatment of soil is a good way to prevent catfish, but 666 powder easily accumulate in animals and plants, resulting in chronic poisoning, the state limits the production. So what kind of agent to deal with the soil, eliminate both economic and economic