The biological characteristics of Cydia trasias
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Key Words：Cydia trasias, biological, life history
Abstract： The biology of Cydia trasias (Meyrick) in Tai′an was observed by rearing large numbers of individuals of C. trasias indoors and field observations. The results show that C. trasias has 3 generations in Tai′an each year. The larvae of this pest can damage the petioles and seed pods of the Chinese scholar tree (Sophora japonica); each larva can damage 9-12 shoots during the feeding phase of its life history. During outbreaks, larvae can cause extensive leaf drop, bare twigs and seed pod damage, reducing the ornamental and economic value of trees. They overwinter after October as larvae in seed pods, bark crevices, and twigs of the Chinese scholar tree.