Study on the Bionomics and Control of Clostera anastomosis

Clostera anastomosis is one of the main leaf eating pests of artificial poplar plantations in the west of Jilin Province. This paper deals with the bionomics and control of this pest.C.anastomosis has 3 generations a year in the west of Jilin Province. In the field, there is a neat generation. There are five instars during the larval stage. The young larvae have a habit of spilting skill, falling as well as spreading by wind. The 2nd instar larvae overwinter within thin cocoons in the fallen leaves or the bark’s holes and begin to act in late spring next year. The mature larvae pupate within the curling leaves on the trees. The adults fly to light at night and migrate for short-distance. The eggs are laid on leaf back and the average number of eggs laid per female is 552. Control methods include (1) hand-collection of fallen leaves and burning them in the spring or the autumn, with the rectfied mortality of 79.6%;(2) stopping the larvae from the bark and killing them in the early spring, with the rectified mortality of 94.0%;(3) spraying benzoyphenol urea No.3 in the larval stages, with the rectified mortality of 95.2%;(4) releasing Trichogramma dendrolimi in the egg stages in the case of their low density, with the rectified parasitic ratio of 48.2%～57.3%.