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蚜霉菌是抑制我省棉田伏蚜的最主要的天敌,其流行时间和强度关系到当年棉田伏蚜持续时间和猖獗程度.经多次鉴定,我省流行的蚜霉菌优势种为Entomophthora Fresenii Nowakowski.它除了大量寄生棉蚜外,对豆蚜、花生蚜、高粱蚜、菜蚜等多种蚜虫都能感染,是一种非常宝贵的天敌资源.一、流行规律影响蚜霉菌流行的主要因子是降雨.通常我省6月份进入雨季后,若遇连续4天以上的降雨天气,雨量达50毫米左右,日平均
The prevalence and intensity of the aphids were the most important natural enemies to control the cotton aphid in cotton fields in our province. The prevalence and severity of the aphids were closely related to the duration and prevalence of the aphids in the cotton fields of that year. After many times identification, the predominant species of the aphid in our province was Entomophthora Fresenii Nowakowski. In addition to a large number of parasitic cotton aphids, it is a very valuable natural enemies for aphids such as bean aphid, peanut aphid, sorghum aphid, aphid, etc. First, the prevalence of the main factor affecting the prevalence of the aphid is rain Usually in June after entering the rainy season in our province, in case of continuous rainfall for more than 4 days weather, rainfall of about 50 millimeters, the average daily