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对杭州郊区菜蚜的数量消长规律进行了连续多年的系统调查 .结果表明 ,在杭州郊区十字花科蔬菜上发生的菜蚜只有桃蚜 (Myzuspersicae)和萝卜蚜 (Lipaphiserysimi) .2种菜蚜混生种群的数量消长 1年中有 2个明显的高峰 ,分别出现在 5～ 6月和 1 1月前后 ;一般年份高峰期田间虫量可达平均每株 50 0头以上 ,且第 2个高峰虫量较高 ,持续时间较长 .在夏末秋初气温明显偏低的年份 ,8～ 9月作物上虫量上升迅速 ,最高也可达平均每株上千头的水平 .盛夏和隆冬季节数量都很低 .每年的 1 2月至次年的 5月以桃蚜占绝对优势 ,7～ 1 0月以萝卜蚜占绝对优势 ,而 5～ 7月和 1 0～ 1 2月则 2种蚜虫的发生比例交错变换 .温度是决定菜蚜混生种群数量消长规律和导致 2种蚜虫季节消长规律差异的一个主要因子 .文中对食料、天敌等因子的作用也做了讨论 .
The results showed that there were only Myzus persicae (Myzuspersicae) and Lepidopia aphid (Lipaphiserysimi) on the crucifer vegetables in the suburbs of Hangzhou. There were two obvious peaks in the population growth and decline in one year, which occurred in May and June and January and January respectively. In the general year, the average number of pests in the field reached 50 or more per plant, and the second peak Higher in quantity and longer in duration.When the temperatures were significantly lower in late summer and early autumn, the amount of insects on crops increased rapidly from August to September, reaching a maximum of one thousand heads per plant on average. Are very low from January to February of each year in May to occupy the absolute advantage Myzus persicae, 7 ~ 10 months to turnip aphid dominant, and May to July and 10 ~ 12 months, two kinds of aphids The temperature is one of the main factors which determine the rule of the quantity and growth of the mixed population of B. auricula and the difference of seasonal fluctuation of the two kinds of aphids.The effects of food, natural enemies and other factors are also discussed.