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苜蓿蚜(Aphis medicaginis Koch)是新疆棉区的主要害虫之一。在北疆玛纳斯河流域棉区发生较重在南疆棉区近年来发生虽较轻微,但在1963年由于气候适宜,部分棉田则有渐趋严重之势。据棉农反映:“是四十年来所罕见的”。为此我们在沙雅县托衣堡公社一杆旗大队棉田内进行了初步观察。 一、为害时期 据1963年观察,苜蓿蚜在棉田内为害时间虽短,但来势猛。5月25日只有极个别棉株上发现少数有翅蚜,而6月4日有蚜株率上升到61％,6月14日即
Aphis medicaginis Koch is one of the major pests in Xinjiang cotton area. In the northern part of the Manas River Basin cotton occurred heavier in southern cotton area occurred in recent years although minor, but in 1963 due to the climate is suitable, part of the cotton field is gradually becoming more serious. According to the cotton farmers: “It is rare for forty years.” To this end, we carried out a preliminary observation inside a flag team of Tuoyibao commune in Shaya County. First, the period of harm According to the observation of 1963, alfalfa aphid damage in the cotton field is short, but the trend fierce. Only a handful of winged aphids were found on only a few individual cotton plants on May 25. On June 4, the rate of aphids rose to 61%. On June 14