七星瓢虫对苹果蚜的田间捕食控害效果研究

Studies on the Predatory Effect of Coccinella seplempunctata (Linnaeus)to Aphis citricola Van der Goot

通过田间观察测定七星瓢虫成虫及高龄幼虫对苹果蚜的捕食控害效果表明,瓢虫捕食时蚜虫群体燥动不安持续时间1min12s,蚜虫腹部和后肢翘起、腹管不断分泌排泄。七星瓢虫2种虫态对苹果蚜虫口密度捕食性能可用Holling-Ⅱ型方程很好地拟合,瓢虫自身不同密度捕食性能可用Hassell数学模型较好地反映。七星瓢虫不仅直接捕食,还惊扰苹果蚜食无定所,生活紊乱,繁殖率下降,捕食控害效果明显。捕食效果在一定范围内随蚜虫密度的增加而增加,随瓢虫密度的增加而下降。盛发初期0.067hm2果园人工助迁3000头,2周后苹果蚜自然消退。在果麦混合种植生态区有一定的利用价值。

The Predatory effect of the adults and high year old larva of Coccinella seplempunctata (Linnaeus)to Aphis citricola Van der Goot in apple trees were tested in die field. The results showed that The last time is 1min12s, Aphid belly and Hind legs are Lift, Stomach tube Excrete Constandy, The Prey for food function of the Coccinella seplempunctata (Linnaeus)could match The equation- Ⅱ of Holling very well, the prey function of the Coccinella seplempunctata (Linnaeus)in Different density could reflect with The maths model of Hasse 11. Coccinella seplempunctata(Linnaeus) Not only Prey for food, but also have the Trouble to the Aphis citricola Van der Goot on lives and Movable place. Prey effect increase with the Aphis citricola Van der Goot density increase and derease with the Coccinella seplempunctata(Linnaeus) density increase. If you Move 3000 Coccinella seplempunctata (Linnaeus)from Wheat field Aphis citricola Van der Goot will disappear in two weeks.It has vary good value in the Wheat and fruit mixs area.