玉米螟白僵菌高致病性菌株筛选

Screening of Highly Pathogenic Strains of Beauveria bassiana Against Ostrinia Furnacalis Guenée

对7株寄生玉米螟的白僵菌菌株产孢量、营养生长量、孢子萌发速率生物学特性指标及对玉米螟3龄幼虫致病力进行了测定,筛选对玉米螟高致病性白僵菌菌株。结果表明:不同菌株间存在较大的差异,综合各项生物学特性指标数据,筛选出生物学特性表现优良的高致病性菌株1株,即BC6菌株。BC6菌株产孢量达到18.35×107个/cm2,14 h的萌发率为96.59%,营养生长量为2.722 mm/d。通过对玉米螟3龄幼虫致病力的测定,校正死亡率达到了90%。各项生物学特性指标均显著高于实验室原有对照(CK)菌株,具有工厂化生产潜力和实际应用价值。

In order to screen pathogenic strains of Beauveria bassiana,sporogenous high ability,vegetative growth,spore germination rate and pathogenicity of seven Beauveria bassiana strains were assayed.The results showed that different strains showed an obvious difference in sporulation,vegetative growth,spore germination rate and pathogenicity for 3rd instar larvae of the corn borer.Among those 7 strains,the strain BC6 was recognized as a good candidate strain for its high sporogenous ability(18.35×107/cm2) on PDA ...