Biological Characteristics of Cyamophila willieti in Xining

Cyamophila willieti reproduced two generations every year in Xining of Qinghai Province,its adult overwintered in the covert place of its host tree cave,and then started its activities in mid and late March next year,the female oviposited in the sprout slit from to mid April,the nymph began to appear from early to mid May and the nymph stage has five instars,the first generation occurred in early June and reached the peak from June to July.The generation overlapping happened.There were 3 peakperiods during the stage of the adult of C.willieti.Developmental duration was 21 from the egg stage,43 days from the nymph stage.The ratio between female and male was 1.05:1.00.