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一、消灭虫源菌源 (一)处理稻桩和杂草 稻螟、叶蝉、稻瘿蚊、纹枯病、稻瘟病、白 叶枯病等多种害虫和病菌都是在稻桩、残株内 外越冬或寄生在田内外、沟塘边杂草上越冬。越 冬后的稻螟幼虫,在化蛹时期需要大量的氧气, 经短期浸水淹没稻桩断绝氧气供应,可使幼虫 全部死亡,因此,必须掌握在越冬幼虫将近化 蛹时,及时翻耕全部绿肥田和冬闲田,以杀死 越冬幼虫。在华南地区应于惊蛰前进行耕翻灌 水7-10天,在华东、华中一带于清明前后灌 水10天左右,便能杀死稻桩中的螟虫。绿肥留
First, the elimination of sources of insect origin (A) dealing with rice piles and weeds Rice borers, leafhoppers, rice gall midge mosquito, sheath blight, rice blast, bacterial blight and other pests and bacteria are in the pile, Overwintering or parasitic in the field both inside and outside the plant, the pond weeds overwintering. After overwintering, the rice borer larvae require a lot of oxygen during the pupation period. After short-term flooding, the rice stumps are submerged to cut off the supply of oxygen, which can cause all the larvae to die. Therefore, it is necessary to grasp all the green manures in time when the overwintering larvae are near pupae And winter fallow fields to kill overwintering larvae. In southern China, 7-10 days of tillage irrigation should be carried out before the start of Jingzhe. In east and central China, irrigation of about 10 days before and after Ching Ming can kill stem borers in the rice pile. Green fertilizer stay