丝孢纲7个真菌属菌株发酵产物杀虫活性的初步研究

本文报道丝孢纲7个真菌属菌株发酵产物对棉蚜和其中5个真菌属菌株发酵产物对大豆二斑叶螨杀虫活性的研究。用水培棉苗法培养棉蚜，盆栽大豆培养二斑叶螨，采用菌株发酵产物浸渍法进行生物测定。结果表明：受试菌株发酵产物对棉蚜防效均高于对照，其中单格孢菌(Ulocadium)、链格孢菌(Alternaria)、匍柄霉菌(Stemphylium)的防效较稳定，蠕孢霉菌(Helminthoid)和皮司霉菌(Pithomyces)的防效次之，弯孢霉菌(Bipaloria)和附球菌(Epicoccum nigrum)的防效不稳定。其中除附球菌和皮司霉菌以外的5个真菌属菌株发酵产物对二斑叶螨也有杀虫活性．但防效不稳定。

PRELIMINARY STUDY ON INSECTICIDAL ACTIVITY OF ZYMOTIC METABOLITES FROM THE SEV EN STRAINS OF HYPHOMYCETOUS FUNGI TO INSECT

The zymotic metabolites of the seven strains of hyphomycetous fungi and five strains of them were prepared, and their insecticidal effects were reported in this paper. The bioassay to breed Aphis gossypii with liquid-cultivated cottons and to breed Tetranychus with potted-soybeens and then make use of dipping-methods to test. In the laboratory tests, insecticidal effects of the tested strains to Aphis gossypii were obviously better than that in control class. The insecticidal effects of Ulocadium,Alternaria,Stemphylium were more stable than those of the extracts from Helminthoid and Pithomyces. The insecticidal effects of Bipaloria and Epicoccum nigrum were also unstable to Aphis gossypii. The five strains of hyphomycetous fungi except Epicoccum nigrum and Pithomyces also have insecticidal activity to Tetranychus , but the effects were also unstable in this experiment.