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1963-1965年我们在江苏海安地区对苜蓿蚜(Aphis medicaginis Koch)进行了观察,现将初步结果整理如下: 一、苜蓿蚜的为害性 苜蓿蚜除为害蚕豆外,还为害苜蓿、苕子、豇豆、扁豆、花生和洋槐等。它集中在嫩头、花序上吸收汁液,常造成生长停滞、植株矮小、花易脱落、结荚少而籽粒轻。被害重的成为“龙头”),甚致整株枯死。据测定,单枝有虫70头的比38头的平均减少结荚21％。龙头枝比健全枝平均减少结荚59％,每荚减少0.23粒、百粒重减少17.6％,总的产量损失70.64％。 二、主要习性 1.耐寒性:据1965年1月11日大田观察,在
From 1963 to 1965, we observed the Aphis medicaginis Koch in Hai’an, Jiangsu province. The preliminary results are summarized as follows: I. Harm of alfalfa aphid In addition to damaging broad beans, alfalfa aphids are also harmful to alfalfa, razor clam, cowpea , Lentils, peanuts and acacia and so on. It is concentrated in the tender head, inflorescence to absorb juice, often resulting in stagnation of growth, plant dwarf, easy to fall off, less pods and light grain. Victimized as a “leader”), but even the entire dead. It was determined that the number of single-headed insects 70 heads reduced the average pod 21% by 38 heads. The faucet branches reduced the pods by 59% on average and 0.23 grains per pod, the decrease of 100 kernel weight by 17.6% and the total yield loss by 70.64%. Second, the main habits 1. Cold tolerance: According to January 11, 1965 observations in Daejeon, at