人工助迁多异瓢虫和化防2种模式对棉蚜的防效及天敌种群动态影响

Effects of Artificial Migration of Harmonia Axyridis and Chemical Control on the Control Effect of Cotton Aphid and the Population Dynamics of Natural Enemies

【目的】研究释放多异瓢虫(Adonia variegate(Goeze))防治棉田害虫-棉蚜(Aphis gossypii)的生防技术,寻求生物防控棉蚜的方法。【方法】采用棉田天敌多异瓢虫释放、化学防治和不防治3种不同处理措施,研究棉田棉蚜暴发前多异瓢虫对棉蚜的控制效果。【结果】在棉田中释放多异瓢虫后,棉田内的蚜虫数量较CK棉田有显著减少的趋势,在释放多异瓢虫20 d后棉田内蚜虫数量水平接近化学防治棉田;不同防治处理的防效之间有显著性差异,生物防治棉田在处理30 d后防效达到化学棉田相近水平;生防棉田中多异瓢虫各虫态数量高峰期较其他2种处理棉田均出现滞后现象,但各虫态高峰期数量均显著高于其他2种棉田。【结论】生防棉田多异瓢虫数量高峰期持续时间高于化防处理及CK处理,其防效较化防棉田更具稳定性。

【Objective】To explore the biological control technology of releasing Adonia variegate(Goeze)against cotton field pest-Aphis gossypii and the biological control method of cotton aphid.【Method】The control effect of Adonia variegate(Goeze)on cotton aphid outbreak in cotton field was systematically studied by three different treatment measures:release,chemical control and no control.【Result】The results showed that the number of aphids in the cotton field decreased significantly compared with that in the CK field,and the number of aphids in the cotton field was close to that in the chemically controlled cotton field after release of Adonia variegate(Goeze)20 days.There were significant differences in control effect among different treatments.The control effectiveness of biological control cotton field reached the same level as that of chemical cotton field after 30 days of treatment.However,the peak number of Adonia variegate(Goeze)in different growth periods in biological control cotton field was significantly higher than those in the other two cotton fields.【Conclusion】The peak duration of Adonia variegate(Goeze)in the biological control cotton field was longer than those in the chemical control cotton field and CK treatment,and its control effect was more stable than that of chemical control cotton field.