蝉拟青霉防治菜粉蝶幼虫试验

FIELD EXPERIMENTS ON THE PATHOGENICITY OF PAECILOMYCES CICADAE TO PIIERIS RAPAE [LEP. : .PIERIDAE]

蝉拟青霉对菜粉蝶幼虫有较强的致病性。田间试验,幼虫期喷洒2.4～1.8孢子,ml孢子悬浮液,感病率达65～70％。而在卵期施菌,可使90％初孵幼虫感病死亡。此菌可在一些自然基物上培养,能形成大量分生孢子。

An entomopathogenic fungus, Paecilomyces cicadas was isolated from Platylomia pieli [Hom.: Cicadidae] in 1984. Field tests in 1986-88 showed that this pathogen had high pathogenicity to the imported cabbageworm, P. rapae. Applying a water suspension at 2.4×107 - 4.6×07 spores/ml in the field at the larv.al stage of P. rapae resulted in 65-70% infectivity. The infectivity of newly hatched larvae was 90% when the spore suspension was applied at the egg stage of the pest. The pathogen could easily be cultured on some common media, producing large amount of conidia. The pathogen remained its infectivity after one year storage at room temperature.