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稻秆潜蝇Chlorops oryzae Matsumura在七十年代以前,我县山区只有在一季中稻播种时间迟的情况下,越冬代成虫羽化后,在游草上产卵繁殖,第二代成虫又回到看麦娘产卵,即看麦娘—游草—看麦娘。由于营养条件、天敌等原因,种群数量不大。仅第二代幼虫偶而在水稻上发现,不引起人们的注意。七十年代以来,随着双季稻面积的扩大,播种季节提早,这一害虫则由看麦娘—水稻—看麦娘。营养条件大大改善,加之冬泡改冬种,越冬面积广,种群数量迅速增加,危害面积逐年扩大,损失逐年加重。1970年以前,全县4万亩双季稻,大部分在海拔180—
Chlorosis oryzae Matsumura in the seventies ago, only in a season of mid-season sowing time late, the overwintering adult adults emergence, the grass on the spawning breeding, the second generation of adults back to see the wheat Mother spawning, that is to see Aman - grass - look Aman. Due to nutritional conditions, natural enemies and other reasons, the population is not large. Only second-generation larvae occasionally found on rice, do not attract the attention of people. Since the seventies, with the expansion of double cropping rice, sowing season earlier, this pest is by looking Anemone - rice - look Aman. Nutritional conditions greatly improved, combined with winter bubble to change the winter species, overwintering area, the population increased rapidly, the harm area expanded year by year, the loss increased year by year. Before 1970, the county 4 acres of double cropping rice, mostly in the elevation of 180-