萍螟、萍灰螟是一种暴发性害虫,是稻田养萍的重大威胁。近年来,对萍螟、萍灰螟(以下简称两螟)的防治虽然做了一些研究,但对夏季引起两螟猖獗为害的原因,有不同的解释:有的认为两螟可能以成虫越冬,或者是一种迁飞性害虫,到时由大量蛾子在萍体上集中产卵,引起暴发为害;有的推测两螟以卵越冬,而卵的孵化期又是在5月下旬到6月上旬,正好与夏季猖獗为害期相衔接;也有认为幼虫能够越冬,可能是夏 Ping borer, Ping Ping borer is an outbreak of pests, rice is a major threat to Ping. In recent years, although some studies have been done on the prevention and control of Pilocycis, Pilose borer (hereinafter referred to as the “Pilocarididae”), there are different explanations for the reasons why Pilose borer is rampant in the summer. Some think that the stem borers may overwinter their adult worms, Or a migratory pest, by the time a large number of moths lay eggs in the body, causing the outbreak of damage; some speculated that the two borers to the egg overwintering, and egg incubation period is in late May to early June , Just coincides with the rampant summer infestation; also think larvae can wintering, may be summer