Abstract: Dictyoploca japonica Moore has one generation a year in Hubei Province. There are 5 instars in the larval stage. The 4th and 5th instar larvae have 2 types with either green or black color. The larvae feed on 38 species of plants and have 53 kinds of natural enemies. The relationship between the occurrence and environment of this insect is discussed. Control experiments showed that spray with various dilutions of 2.5% deltamethrin (Decis) 5000×, 2×108 spore of Beauveria bassiana, 25% Benzoylphenol urea No.1 500× and the dead body of 1×108 PIB D. japonica infected by NPV were very effective.