苜蓿蚜是豆科作物的主要害虫之一,在湖北广济不仅为害苕草,而且为害红花草、蚕豆等作物。目前有关苜蓿蚜的报导较少,笔者于1963—1964年在湖北广济县对苜蓿蚜的为害、发生与环境条件等关系,进行了观察,现将初步结果整理报导于下。 一、苜蓿蚜为害程度及为害习性 受害的苕草叶片及嫩茎呈现灰黑色斑点,严重时,可使叶片卷缩,逐渐转黄以至枯死。 被害苕草不仅植株矮小,生育期也有所推迟。如未被害的株高140.3厘米,开花20—25％,而被害的株高102.1厘米,仅开花2—3％。据1963年4月17 Alfalfa aphid is one of the major pests of leguminous crops, not only in Jiuxian, Hubei Province, but also for crops such as safflower and broad bean. At present, there are few reports on alfalfa aphids. The author studied the damage to alfalfa aphid in Guangji County, Hubei Province from 1963 to 1964, and its relationship with environmental conditions. The preliminary results are reported below. First, the degree of alfalfa aphid damage and habitual damage Vicia grass blades and stems appear grayish black spots, serious, can make the leaves curling, turning yellow and even dead. Not only plant short grasshoppers, growth period has also been postponed. If not damaged 140.3 cm plant height, flowering 20-25%, while the plant height of 102.1 cm, only flowering 2-3%. According to April 17, 1963