Occurrence dynamics of Cydia pomonella in Jiuquan

Key Words：Cydia pomonella，quarantine pest，occurrence dynamics，field investigation， trap

Abstract：  The codling moth, Cydia pomonella (L.) (Lepidoptera:Olethreutidae), is a serious pest in fruit orchards worldwide and one of the most important pests in China．The bionomics and population dynamics of codling moths in a pear orchard in Jiuquan, Gansu Province, were investigated by field surveys and sex pheromone dispenser trapping. The results show that codling moths at this site produced two generations each year. The peak of adult abundance was in early to mid May and early to mid July. Preferred oviposition sites were the upper canopy, the eastern and southern aspects of trees, and on fruits and the reverse side of leaves. The peak of abundance of two generations of eggs occurred on June 17 and July 26. Shortly after hatching, neonate larvae bored into fruit and remained there throughout their feeding stages, making them very difficult to control during this stage of their development. Codling moths overwintered as mature larvae inside cocoons under the bark of tree trunks or branches and emerged in mid to late April the following year.