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棉蚜的危害,尤其是伏期蚜虫(简称伏蚜),已成为威胁棉花生产的突出问题。近年,在棉蚜的测报与防治工作中,我们对伏蚜的发生规律作了初步观察,认为与其消长有关的因素有以下几点。一、与气候的关系阴雨降温是影响伏蚜发生的主导因素。省东棉区历年伏期气温:6月为25.5℃,7月为27.1℃,8月为25.6℃,其中7月下旬、8月上旬气温历年平均为27.6℃(大荔气象站)。
The harm of cotton aphids, especially the aphid (aphids), has become a prominent problem threatening the cotton production. In recent years, in the report of cotton aphids and prevention and control work, we made a preliminary observation of the occurrence of the aphids, and that its growth and decline related factors are as follows. First, the relationship with climate Overcast rain cooling is the dominant factor affecting the occurrence of aphids. The temperature in the eastern part of the province during the previous years was 25.5 ℃ in June, 27.1 ℃ in July and 25.6 ℃ in August, of which the average annual temperature in late July and early August was 27.6 ℃ (Dali Meteorological Station).