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农牧渔业部农作物病虫测报站报道:预计今秋和明春小麦丛矮病将要流行,发生程度将重于1983和1982年。在早播、间套及草荒严重的麦田中将中度发生。这是因为一些地区草荒严重,病源充足;灰飞虱的数量和带毒虫所占比例偏高;夏秋多雨、秋冬气温偏高少雨,对灰飞虱的生长、繁殖、传毒有利;各地早播与间套田增加,给灰飞虱提供了充足的食料和栖息场所,利于传毒危害。小麦丛矮病又叫“坐坡”、“小老苗”,病源为杆状病毒,由灰飞虱为媒介传播,危害大麦、燕麦、谷子、马唐草、画眉草、马尾草等禾本科农作物及杂草。秋天小麦播种和出苗后,灰飞虱从田间杂草和大田作物上迁入麦田,并由带病毒的灰飞虱将病毒传给麦苗,引起秋苗发病。一般秋播在播种
Reported by Crop Disease and Pest Report Station of Ministry of Agriculture, Animal Husbandry and Fisheries: It is estimated that the autumn and spring wheat dwarf diseases will be prevailing this autumn and will occur more frequently in 1983 and 1982. In the early broadcast, intercropping and serious shortage of wheat fields will moderate. This is because some areas have serious grass shortage and sufficient source of pathogens. The number of Laodelphax striatellus and the proportion of poisoned larvae are high. It is rainy in summer and autumn, with high and low temperature in autumn and winter, which is beneficial to the growth, propagation and poisoning of Laodelphax striatellus. Increased with sets of fields, giving the Laodelphas adequate food and habitat, conducive to poisoning. Wheat dwarf disease, also known as “sit on the slope”, “small seedlings”, the source of baculovirus, transmitted by the Laodelphax striatellus, endangering barley, oats, millet, Crabgrass, thrush, horsetail and other gramineous crops And weeds. After the sowing and emergence of autumn wheat, the Laodelphax striatellus moved into the wheat field from field weeds and field crops, and the Laodelphax striatellus was transmitted by the Laodelphax striatellus with virus. The general autumn sowing