入侵性害虫——苹果绵蚜田间种群数量的调查方法

2007年6月中旬到10底在山东省莱阳市对苹果绵蚜Eriosoma lanigerum(Hausmann)的田间发生数量进行调查研究。在田间定点调查5株苹果树上苹果绵蚜虫落数量和虫落面积,并在其它苹果树上随机选择20个虫落,计数每个虫落中苹果绵蚜的活体数,从而计算单位面积虫落中苹果绵蚜的平均数量。分析指出,以计算法求得的虫落中苹果绵蚜的实际数量为指标,既考虑了苹果绵蚜虫落的数量和大小,也考虑了单位面积虫落中苹果绵蚜活体数,并且把被苹果绵蚜蚜小蜂寄生的僵蚜排除在外,能较客观地反映出田间实际情况,是一种比较准确的表示苹果绵蚜田间数量的方法。

Investigation methods for population size of Eriosoma lanigerum in the orchard

A method for studying population size of Eriosoma lanigerum(Hausmann) in the orchard was used in Laiyang,Shandong from middle June to late October in 2007.Numbers and area of colonies in 5 fixed apple trees were investigated,and 20 randomly selected colonies from other apple trees were checked to count the average number of living E.lanigerum in per squared centimeter of the colony.The results showed that it was an accurate method to present the population size of E.lanigerum by the area of the colonies and the averaged density of alive and excluding the parasitized E.lanigerum in the colonies.Thus parasitization of E.lanigerum by Aphelinus mali were excluded.