【摘要】 沟金针虫在南阳一带主要分布在沿河平原壤土地区。1963年在新野严重为害地区的初步调查表明:高密度(每平方米23.5头)地块多为连年一年两熟或四年七熟,晚秋作物多系玉米、绿豆和红薯等;低密度(每平方米2.7头)地块则以三年五熟及一年一熟为主,晚秋作物多为芝麻和黄豆。结合沟金针虫在当地的生活习性分析,认为伴随不同轮作制的土壤耕作是影响金针虫数量变动的主导因子。鉴于当前农业生产上急于要求合理轮作倒茬,同时有关文献也述及对大面积金针虫防治应重视农业措施的方向,建议除对金针虫发生为害与当地农作制的关系进行深入调查研究外,在严重为害区,建立这方面的防治示范点。就南阳地区情况,试采用如下措施:(1)金针虫严重地块,当季作物收获后尽可能休闲。否则进行666土壤处理。(2)尽可能采用三年五熟或四年六熟的轮作制,避免三年以上的连年—年两熟。(3)在以小麦为主的轮作制中,尽可能用芝麻、黄豆等换替玉来、绿豆及红薯等;避免三年以上的小麦与玉米、绿豆及红薯等连年连作。更多还原

【Abstract】 The wheat wireworm, Pleonomus canaliculatus Fald. is densely distributed over theloamy region along the river banks in Nanyang, in south-west Honan. The results ofa preliminary field survey made in May, 1963, show a striking contrast of populationdensity between the two groups of fields under different crop rotation systems. Theheavily populated fields are those that have been continuously used for growing twocrops a year, and the intervening crops in the wheat rotation are usually corn, mungbeanand sweet potato. On the other hand, the fields of low population density are generallyused for growing five crops in three years or a single crop a year, sesame, soybean andsorghum are mainly used as the intervening crops. Analysis of the factors responsible for the differences in pest population density indi-cates that the cultural practices and fallowing in the different rotational systems are themajor ones involved. Suggestions on rotational control measures are made for the heavily infested regions.It is believed that a 5-crop-3-year-rotation should be adopted as much as possible, whilethe less susceptible crops (sesame, soybean etc.) are used as intervening crops in thewheat rotation.更多还原