华栗绛蚧的生物学特性及防治

华栗绛蚧是板栗枝干上的主要刺吸性害虫之一。该虫1 a发生1代,以2龄若虫越冬,越冬后的2龄若虫和雌成虫固定寄生在板栗枝干上刺吸寄主汁液危害。成虫期在4月上旬至5月下旬,行两性生殖,存在孤雌生殖,雌成虫平均产卵量为3 975粒。若虫在5月上旬孵化,5月末达盛期。用10%高渗吡虫啉可湿性粉剂1 000倍液在越冬若虫膨大期进行喷杀效果好。黑缘红瓢虫、绛蚧跳小蜂和芽枝状芽孢霉菌是控制虫口密度的重要天敌。

Bionomics and control of Kermes castaneae

Kermes castaneae Shi et Liu is one of the sap feeders attacking Castanea mollissima.It has one generation a year and overwinters as nymph in the 2nd instar.The nymph in the 2nd instar and female adult stay on the trunk of the host and suck.The adult stage is between the first ten days of April and the last ten days of May.The females are amphigonic and some are parthenogenetic.Each female adult lays 3975 eggs on average.The nymph hatches in the first ten days of May with a peak in the end of May.Spray of 10% high permeation imidacloprid wettable powder has a good effect against the overwintering nymph and Chilocorus rubidus Hope,Psilophrys sp.and Cladocporium cladosporioides(Fres) De Yries are the dominant natural enemies.