Control Effects of Two Released Natural Enemy Insects and Their Effect on Natural Enemy Populations in Tobacco Fields
The biological control efficacy against Myzus persicae(Sulzer)and Thrips tabaci(Lindeman)was evaluated by releasing Aphidius gifuensis(Ashmead)and Neoseiulus barkeri(Hughes)into a tobacco field in Miyi,Panzhihua,Sichuan Province,for two years.The effect on tobacco aphids,thrips,and other insects was assessed during the presence of the released natural enemy insects.The results showed that:the control effect of Aphidius gifuensis against Myzus persicae and Neoseiulus barkeri against Myzus persicae was 6.18%and 33.94%in the earlier stage,respectively,and increased to 55.38%and 65.00%later on.However,the effect of imidacloprid treatment was the opposite.Both Aphidius gifuensis and Neoseiulus barkeri had reduced the popu-lations of other insects in the field to 25.12%and 20.02%,respectively,which were far lower than the effect of imidacloprid(53.29%).The population of Syrphidae was most affected with reductions of 39.36%and 51.85%,followed by Coccinella with reductions of 20.77%and 1.57%,while spiders were minimally affected at 12.46%and 1.60%by the natural enemy insects.This study indicates that Aphidius gifuensis and Neoseiulus barkeri are eco-friendly and highly effective for the long-term control of tobacco aphids and thrips.Bio-control technologies like these could be applied in the future.
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