问:在水稻枯心苗发生期喷射200倍的6%γ可湿性六六六后,枯心苗发展数量显著减少。但剥开枯心苗检查时,多为活虫,不见死虫。为什么?答:据1954年在湖南所作试验,枯心苗发生期,特别是枯心苗发生初期,二化螟幼虫大部在2—3龄期间,且多集中于枯鞘或变色叶鞘内,喷射六六六时药液极易渗入并与虫体接触,因 Q: After the seedlings of rice seedlings were sprayed with 200 times of 6% γ-WPB66, the development of the seedlings of Cinnamomum burmani decreased significantly. But peel dry heart seedling inspection, mostly live insects, no dead insects. A: According to the experiment done in Hunan in 1954, when the dead heart seedlings occurred, especially when the dead heart seedlings occurred, most of the larvae of the stem borer were aged 2-3 years old and were mainly concentrated in the sheaths of dead or discolored leaves, When spraying six six six liquid medicine easily penetrate and contact with parasites, due