二斑栗实象生活史观察及粉拟青霉菌防治试验

二斑栗实象在云南玉溪市红塔区、峨山县1a发生1代,以幼虫在土壤中越冬,10月中旬至11月下旬是防治地下幼虫的最佳时期。6月中旬成虫羽化高峰期是防治成虫的最佳时间。用粉拟青霉菌防治地下幼虫药效达86．9％,树冠成虫防治药效为64．3％。地下幼虫和树冠成虫防治的最佳剂量均为22．5kg／hm^2。喷施粉拟青霉菌最好选择雨后晴天无风的早晨和傍晚,防治地下幼虫喷药后应立即进行翻挖。

Observation on the life history of Curculio bimaculatus Faust and its control with Paecilomyces farinosus

Curculio bimaculatus Faust has one generation a year in Yuxi of Yunnan Province and overwinters as larva in the soil.The optimum time for the control of the larva was between mid October and late November and for the adult,it was mid June,the peak of emergence.Use of Paecilomyces farinosus (against) the underground larvae reached a higher control effect of 86.9% while that of adults in the crowns of trees was 64.3%.The optimum dosage for the control was 22.5 kg/hm~2.Paecilomyces farinosus should be sprayed in the sunny and calm days after rain.The plots must be dug over immediately after the spray.