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麦蚜是我县沿江圩田三麦上重要害虫,尤以晚小麦受害更重。对其发生危害及防治进行了初步研究,结果报道如下。 一、麦蚜种类和发生特点 沿江圩田三麦上蚜虫有二种:禾谷缢管蚜(又名黍蚜)Rhopalosiphum padi[Linnaeus]及麦长管蚜Macrosiphum avenae[Fabricius]。 定点田系统观察结果:前期以麦长管蚜较多,后期禾谷缢管蚜所占比例逐渐上升,最高可占到99％以上(见表1)。 大田调查,禾谷缢管蚜比例占59.2—96.4％。禾谷缢管蚜所以能占绝对优势,主要因为这种蚜虫生长势强,繁殖速度快,5月下旬单个蚜虫繁殖平均达45只,而麦长管蚜虫只有4.2只。
Wheat aphid is an important pest on three wheat in our county along the polder, especially in late wheat. Its harm and prevention and control of a preliminary study, the results reported below. First, the wheat aphids species and occurrence characteristics There are two kinds of aphids on the three wheat fields along the polder: Rhopalosiphum padi [Linnaeus] and Macrosiphum avenae [Fabricius]. Site-specific field observations: the early wheat aphid more wheat aphid, the latter part of the proportion of cereal aphids gradually increased, the highest can account for more than 99% (Table 1). Daejeon survey, the proportion of cereal aphids accounted for 59.2-96.4%. Aphis solanaceae so can occupy the absolute advantage, mainly because of the strong growth of this aphid, reproductive speed, in late May single aphids breeding an average of 45, while the wheat aphid tube only 4.2.