球孢白僵菌对烟蚜茧蜂生命参数及控害效果的影响.PDF

26 3433~4392007 Mycosystema 1 2 400716 400716 1900 /mm2 1d 3d 59.6%56.2%34.8% 94% 59%47%83%54%49%5d 7d 8.2% 5d 7d 4d 81.8% 27.8% Q939.5 A 167203-0433-0439 Impacts of Beauveria bassiana on life parameters and control efficiency of Aphidius gifuensis LI Tao1, 2 LIU Ying-Hong2 LI Hui-Yun2 ZHANG Yong-Jun 1* 1 2 ( Biotechnology Research Center, Southwest University, Chongqing 400716, China; College of Plant Protection, Southwest University, Chongqing 400716, China) Abstract: Impacts of Beauveria bassiana on life parameters and control efficiency of Aphidius gifuensis were 2 assessed in laboratory. The groups of aphids were sprayed with B. bassiana at the dose of 1900 conidia /mm at different stages of parasitism, and both mycosis infection rate or mummification rate of Myzus persicae and emergence rate of A. gifuensis from mummified aphids were recorded. The results suggested that mycosis in treated aphids or mummies, as well as adult emergence of A. gifuensis was significantly affected, varying with inoculation time of the fungal spores. Compared to the control spraying with 0.05% ( v/v) Tween-80 only, fungal inoculation at 1 day before, the same day and 3 days after A. gifuensis parasitization, caused about 59.6%, 56.2% and 34.8% aphids being infected, and reduced mummification rate by 94%, 59% and 47% and emergence rate of mummified aphids by 83%, 54% and 49%, respectively. However, spraying B. bassiana at 5 or 7 days after A. 863(No.2002AA245021) (No *Corresponding author. E-mail: yjzhang@swu.edu.cn; Tel: 023 2006-08-312006-10-27 434