寄主植物对瓜蚜无翅胎生雌蚜体重、体色、体内酯酶活性均有明显影响。取食笋瓜、南瓜、瓠子、黄瓜和冬瓜的瓜蚜，体重依次增加，体色渐深，而体内羧酸酯酶活性依次渐低。取食不同奇主植物的瓜蚜对杀虫剂的耐药性与其体内酯酶活性呈正相关。瓜蚜体内羧酸酯酶活性（X）与乐果对瓜蚜的LC50（Y）附会Y=8．3827X－67．8530（r=0．952），与功夫菊酯对瓜蚜的LC50（Y）附合Y=1．040X－28．89（r=0．985）的线性关系。 The host plants had significant effects on the body weight, body color and esterase activity of the green aphid (Aphididae). Cucumber melon, pumpkin, razor clam, cucumber and melon feeding aphids, body weight followed by body color gradually deepened, and in vivo carboxylesterase activity in turn lower. There was a positive correlation between the insecticide resistance and the esterase activity of A. gossypii fed on different dominant plants. Carboxylesterase activity (X) of A. melilota and LC50 (Y) of dimethoate to Aphis gossypii were Y = 8.3827X-67.8530 (r = 0.952) Y) with Y = 1.040X-28.89 (r = 0.985) linear relationship.