环境因子对球孢白僵菌侵染桔小实蝇致病力的影响  

Effects of environmental factors on the pathogenicity of Beauveria bassiana to Bactrocera dorsalis(Hendel)

作　　者：潘志萍[1] 李敦松[1] 曾玲[2] 

机构地区：[1]广东省农业科学院植物保护研究所 [2]华南农业大学资源环境学院昆虫学系,广州510642

出　　处：《环境昆虫学报》2008年第1期13-17,共5页Journal of Environmental Entomology

基　　金：国家“948”项目子课题(2006-G54B);广州市科技攻关项目(2006Z3-E0581);广东省科技计划项目(2002B2160203);广东省科技计划重大专项(2004A20401002)

摘　　要：本文测定了温湿度、紫外线及常见杀虫剂等环境因子对球孢白僵菌B6菌株侵染桔小实蝇致病力的影响。结果表明,在19℃-31℃的温度范围内,B6菌株对桔小实蝇成虫、蛹与老熟幼虫均有致病力。在19℃-25℃条件下,桔小实蝇上述三种虫态的死亡率均随着温度的升高而增加,但在28℃和31℃温度条件下,桔小实蝇的死亡率则随着温度升高而降低。在1.8×10^8孢子/ml浓度条件下,成虫在25℃温度条件下的致死中时LT50为6.6d,在31℃的LT50为30.2d。在不同温度条件下,B6菌株对桔小实蝇成虫的致死中时差异较大。湿度越大,球孢白僵菌致病力越强,桔小实蝇的死亡速率越快。球孢白僵菌孢子萌发率随着紫外线照射时间增加而逐步降低。测定了7种常见的杀虫剂对球孢白僵菌菌落的生长影响,其中25%高效氯氟氰菊酯、2.0%阿维菌素、40%辛硫磷和10%除尽对菌落生长有促进作用。The pathogenicity of Beauveria bassiana suspension to Bactrocera dorsalis （Hendel） under different environmental factors was evaluated in the laboratory. At 19 ℃ - 25 ℃, the pathogenicity of adult flies increased as the temperature increased, while at 28 ℃ and 31 ℃ the mortality decreased. At 1.8 ×10^8 ml concentration of spores, the LT50 was 6.6 days and 30.2 days at 25 ℃ and 31 ℃ , respectively. The pathogenicity was inhibited at both too high and too low temperature. The humidity exhibited positive effect on the pathogenicity. With increased ultraviolet radiation, it gradually reduced the incidence of spore germination. The effect of seven common pesticides on the virulence of mycelial growth were tested, however, 25% lambda-cyhalothrin, 2. 0% abamectin, 40% phoxim and 10% chlorfenapyr could promote the growth of mycelia.

关 键 词：球孢白僵菌 桔小实蝇 致病力 温度 湿度 紫外线 杀虫剂 

分 类 号：S476.12[农业科学—农业昆虫与害虫防治]