摘要： 作者于1980-1988年在河北保定对小麦田蚜虫的优势种——小麦长管蚜(Ma-crosiphum avenae Fabr.)种群消长动态及百茎蚜量与小麦千粒重降低率的关系进行了研究.结果表明:(1) 随季节变化长管蚜的消长呈双峰型.夏季蚜峰正值小麦灌浆时期,这是防治的关键期;(2)灌浆初期、中期的蚜量与千粒重损失率均呈极显著相关.相关系数分别为0.9648和0.9554.回归式分别为:y₁=0.010383x₁-0.871208±3.07与y₂=0.008019x₂+0.182175±1.69;(3)根据河北省当前小麦产量水平,商品价格及防治现状和费用计算,小麦长管蚜的经济阈值,在灌浆初斯为600头,中期为650头.

关键词: 小麦长管蚜, 种群消长动态, 经济阈值

Abstract: The authors of the paper studied in 1980-1988 the growth and decline trends of aphid (M. avenae F. ) and the relationship between the number of the aphid per 100 stems and the weight loss rate of 1000 kernels. The results showed that (1) The growthand decline of the aphid population presented a double-peak type. The highest peak was on the occasion of milking stage of the wheat plant n summer. Therefore this stage is the key for the aphid control; (2) The aphid population at early and middle milking stages was significantly correlated with the weight loss rates per 1000 kernels at early and middle milking stages. The correlation coefficients were 0.9648 and 0.9554. The regression equations are as follows:y₁ =0.010383x₁ -0.871208±3.07and y₂ =0.008019x₂ +0.182175±1.69; (3) Based on the present production level of wheat, the wheat price and the level of cost for the aphid control in Hebei, the economic threshold for the aphid population would be 600 and 650 at early and middle milking stages respectively.

Key words: Macrosiphum avenue Fabr., Growth and decline trends of aphid, Economic threshold