昆虫学报2005，Vol.48Issue(5)：679-686,8.
不同温湿度下球孢白僵菌对小猿叶甲的致病力
Effect of temperature and humidity on the virulence of beetle-derived Beauveria bassiana (Balsamo) Vuillemin(Deuteromycetes: Moniliales) against the daikon leaf beetle, Phaedon brassicae Baly (Coleoptera: Chrysomelidae)
摘要
Abstract
In this study, the effect of temperature and humidity on the virulence of a Beauveria bassiana isolate, SCAU-BB01 D,to Phaedon brassicae, a serious insect pest of cruciferous vegetables in South China, was studied in the laboratory. The mortality of P. brassicae was significant lower at temperature of 17℃ and 29℃ than at other temperatures. At temperature of 23℃, the mortality of adult on the 14th day after treatment reached its highest, 95.60%. For 2nd instar larvae the highest mortality (96.00%) was obtained at both 23℃ and 26℃ on the 10th day after treatment. The pathogenicity of B. bassiana to P. brassicae was enhanced as relative humidity increased. When relative humidity (RH) was increased from 50% to 100% , adult mortality 14 days after treatment was enhanced from 55.70% to 88.80% and 2nd instar larvae mortality 10 days after treatment was enhanced from 62.00% to96.00% . At 17, 20, 23, 26, and 29℃, the LT50 values were 13.63, 10.27, 8.05, 8.87 and 12.41 days for adults, and 6.06, 5.72, 4.90, 4.86 and 6.73 days for 2nd instar larvae, respectively. LT50 values at RH of 50%, 60%, 70%, 80%, 90% and 100% were 12.97, 10.97, 10.13, 9.79, 9.14, 8.29 for adults and 7.68, 6.92, 5.76, 5.57, 5.48, and 4.82 days for 2nd instar larvae, respectively. Therefore, temperatures between 23 - 26℃ and RH higher than 80 % were the most suitable conditions for promoting infection of B. bassiana to P. brassicae.关键词
球孢白僵菌/小猿叶甲/温度/湿度/致病力Key words
Beauveria bassiana/Phaedon brassicae/temperature/humidity/virulence分类
生物科学引用本文复制引用
何余容,吕利华,邝灼彬,冯夏,陈焕瑜,武亚静..不同温湿度下球孢白僵菌对小猿叶甲的致病力[J].昆虫学报,2005,48(5):679-686,8.基金项目
国家自然科学基金项目(39930120) （39930120）
广东省科技计划项目(200320501) （200320501）
