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近年来,三麦丛矮病的发生为害已成为三麦生产上的问题之一。我们对本地灰稻虱自然消长和几种禾本科杂草的发病情况作了一些调查研究,现将初步结果报告于下。一、灰稻虱的周年消长及其传毒活动、(一)发生世代及各代发生期:通过常年定期野外调查和室内饲养相结合,初步查明,灰稻虱在苏北沿海棉区常年发生五代。在麦田为害的为越冬代和第一代,整个为害期从10月上旬起至第二年5月下旬陆续迁出止,共长达200天。
In recent years, three wheat dwarf disease damage has become one of the three wheat production problems. We have made some investigations on the natural decline and growth of the local ash bugs and the incidence of several grass weeds. The preliminary results are reported below. First, the annual growth and mortality of the gray flies lice and its transmission activities, (A) Generations and the occurrence of each generation: Through routine perennial field surveys and indoor rearing, a preliminary identification of gray flies in northern Jiangsu coastal perennial Occurred five generations. In the wheat field for the victims of the overwintering generation and the first generation, the entire period of harm from the beginning of October until the second year in May after another move, a total of up to 200 days.