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研究了球孢白僵菌Beauveria bassiana侵染棉铃虫对3龄幼虫呼吸速率和食物利用的影响。结果表明,1×10~6和1×10~8分生孢子/ml孢子悬浮液处理后,高浓度处理幼虫前3d的呼吸速率较对照下降幅度缓慢,但从第4d起呼吸速率明显下降。低浓度组在处理后的前2d呼吸速率上升,随后逐渐下降。总体上,白僵菌侵染后棉铃虫幼虫的呼吸强度较对照呈先显著上升后迅速下降的趋势变化。处理后1～2d棉铃虫幼虫的取食量、体重增加数及食物转化率(ECD)、利用率(ECI)等各项营养指标与对照无显著差异,但3～4d后棉铃虫取食减少,体重下降,食物利用率ECI和转化率ECD出现负值,并逐渐死亡。
The effects of Beauveria bassiana infection with Beauveria bassiana on respiratory rate and food use of 3rd instar larvae were studied. The results showed that after 1 × 10 ~ 6 and 1 × 10 ~ 8 conidia / ml spore suspension treatment, the respiration rate of the 3rd instar larvae treated with high concentration decreased slowly compared with the control, but the respiration rate decreased obviously from the 4th day. In low concentration group, the respiration rate increased in the first 2 days after treatment and then decreased gradually. In general, the respiratory intensity of B. armigera larvae after the infection of Beauveria bassiana was significantly higher than the control after the first rapid decline in the trend. There were no significant differences in the nutritional indexes of the cotton bollworm larvae, including the feeding amount, body weight gain, food conversion rate (ECD) and utilization rate (ECI), between 1 and 2 days after treatment, , Weight loss, food utilization ECI and conversion ECD negative, and gradually died.