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研究了七星瓢虫对棉蚜的捕食作用。用血清学方法测得了棉田中七星瓢虫捕食棉蚜的阳性率 ,并按 F=L· r· n,P=F/D估计了七星瓢虫对棉蚜的日捕食量及棉田中棉蚜的被捕食率
The predation effect of Coccinella septempunctata on cotton aphid was studied. The positive rate of cotton aphid in cotton field was measured by serological method. The daily predation rate of cotton ladybug to cotton aphid was estimated according to F = L · r · n, P = F / D and cotton aphid The prey rate