Predation of Synonycha grandis(Thunberg) Adult on Peach Aphid

OU Shan-sheng(Guangxi Agricultural Vocational and Technical College, Nanning,Guangxi 530007)  

[Objective] The research aimed to known the predatory capacity and using value of Synonycha grandis(Thunberg) adult on peach aphid.[Method] A head of S.grandis adult was put on a culture dish,and then the wingless peach aphids with densities of 20,40,60,80,100,120,140,160 and 180 heads were put on the each culture dish resp.and fed under the lab natural condition to study the predation of S.grandis adult on peach aphid.[Result] Average daily predatory number of a head of S.grandis adult on peach aphid increased with the increment of peach aphid density when peach aphids were in 20～120 heads/dish,reached maximum(83.889 heads) and decreased when peach aphids were more than 120heads/dish.The predatory function response of S.grandis adult on the wingless peach aphids accorded to Holling Ⅱtype disc equation,and the theoretical value of maximum daily predatory number being 227.4278 heads.[Conclusion] Under the lab natural condition,S.grandis adult had great number predation on peach aphid,so it is the important resource of natural enemy for controlling peach aphids and is worth protecting and being made of full use.

【Key Words】： Synonycha grandis(Thunberg) Peach aphid Functional response
【Fund】： 广西农业职业技术学院自然科学研究基金(农职科B07-0006)
【CateGory Index】： S476.2

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