冠水後水田でのアワヨトウ幼虫の異常発生

抄録

In August 1983, an outbreak of the armyworm (Pseudaletia separata WALKER) occurred in the rice fields of Kawamoto, Shimane. Almost all the leaves of rice plants were eaten by gregarious larvae. The heavy attack by themature larvae occurred nearly one month after flooding. Female immigrants appeared show active oviposrtion afterthe flood.