摘要
B型烟粉虱Bemisia tabaci Gennadius是一种重要的世界性农业害虫。玫烟色棒束孢Isaria fumosorosea是防治烟粉虱的一种重要的虫生真菌。对不同温度(20、23、26、29、32℃)、不同湿度(53%、65%、75%、85%、95%)下玫烟色棒束孢IF‐1106菌株分生孢子萌发及其对烟粉虱的致病力进行了测定。结果表明:温度对孢子的萌发有显著影响,26℃时孢子萌发率最高。当相对湿度低于75%时,孢子不萌发或萌发率较低;当相对湿度为85%–95%时,孢子萌发率显著升高。26℃时,烟粉虱2龄若虫的累计死亡率最高。随着相对湿度增大,病菌的致病力增强。当相对湿度为53%–95%时,烟粉虱2龄若虫累计死亡率从54.55%增加到88.89%。玫烟色棒束孢的致病力与孢子萌发率呈正相关,但温度比相对湿度对其影响更明显。结果表明,玫烟色棒束孢IF‐1106菌株侵染烟粉虱的最佳条件是温度26℃和相对湿度大于85%。
Bemisia tabaci B-biotype （Homoptera： Aleyrodidae）, is an important agricultural pest in the world. Isaria fumosorosea （Hypocreales： Cordycipitaceae） is one of the most important fungi for control of B. tabaci. The effects of temperature （20, 23, 26, 29, 32℃） and relative humidity （53%, 65%, 75%, 85%, 95%） on conidial germination and pathogenicity of I. fumosorosea IF-1206 against 2nd instar nymphs of B. tabaci were investigated. The results indicated that the conidial germination of the pathogen was significantly affected by temperature with maximum germination rate at 26℃. The conidial germination rate was higher when RH ranged from 85% to 95%, but down or ungerminative when RH lower than 75%. The cumulative corrected mortality of 2nd instar nymphs reached to a peak at 26℃. The pathogenicity of I. fumosorosea increased with RH. The cumulative corrected mortality of 2nd instar nymphs increased from 54.55% to 88.89% in RH range from 53% to 95%. The pathogenicity of I. fumosorosea against B. tabaci was significantly related to conidial germination rate, and it was more significantly affected by temperature than RH. It is concluded that the optimal conditions for I. fumosorosea IF-1106 to infect B. tabaci were temperature at 26℃ and RH over 85%
出处
《菌物学报》
CAS
CSCD
北大核心
2014年第3期668-679,共12页
Mycosystema
基金
Supported by 948 Project of the Ministry of Agriculture of China(No.2011-Z32)
Grant of Shanxi International Science and Technology Cooperation(No.2011081004)
Major Science Research Project of Shanxi(No.20090311030),BJRC(No.201201)
Excellent Innovation Project of Graduate Students of Shanxi(No.20123050)
关键词
玫烟色棒束孢
烟粉虱
最佳侵染条件
孢子萌发率
致病力
Isariafumosorosea, Bemisia tabaci, optimal conditions of infection, conidial germination rate, pathogenicity
