白僵菌Beauveria bassiana防治咖啡天牛

在昆明动物研究所和云南省思茅市大开河咖啡场进行了咖啡天牛的白僵菌防治试验。室内和田间试验结果表明，只要接触到白僵菌的各龄咖啡天牛，均可被感染致死；室内培养条件下的虫体一般在第15天左右致死率可达90％以上，室内木段堵孔到第20天累计死亡率达90％以上，室外插竹签，菌签插孔和菌泥堵孔法在第20天防治效也可达90％以上，手撒菌粉和喷菌液法虽有一定防治作用，但效果不显著，产量测定结果显示，生物防治区咖啡鲜果每0．067公顷（1／15ha.)比对照区高125．7kg；与几种常用杀虫剂防治费用比较认为，白僵菌是一种经济、安全的生物杀虫剂。

BIOLOGICAL CONTROL OF COFFEE STEM BORERS, XYLOTRECHUS QUARDRIPES AND ACALOLEPTA CERVINUS, BY BEAUVERIA BASSIANA PREPARATION

The use of Beauveria bassiana proparations for control of coffee stem borers, Xylotrechus quardripes Chevr. and Acalolepta cervinus (Hope), as tested in the laboratory and field conditions. The results show that each instar of coffee stem borers could be infected and killed successfully when being inoculated or contacted with B. bassiana . The control efficacy under indoor cultivation conditions exceeded 90% within 15 days. Jamming drilled hole with fungal mud resulted in the accumulative mortality and corrected mortality of >90% within 20 days. In the field, three methods, jamming drilled holes with bamboo sticker, bamboo sticker with fungal mud, and fungal mud only, were employed, and each led to the control effect of > 90% within 20 days. However, spraying suspensions and dusting powder of B. bassiana was insignificant. The yield of fresh coffee fruits in biological control area was 125 7?kg/0 067?ha greater than that of control area when being harvested in February. Compared the cost of microbial control with that of chemical control, B. bassiana proved to be a profitable, effective, and safe biocontrol agent against coffee stem borer.