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二化螟是水稻重要害虫,此虫食性杂,除为害水稻外,还为害茭白、玉米、高粱、油菜、甘蔗、麦类、蚕豆等农作物及芦苇、稗等多种禾本科杂草,近年来随农村种植业结构调整,耕作制度改变,发生数量明显上升,为害逐年加重。二化螟在华北稻区一年发生2代,西南稻区发生2～3代,长江中下游3～4代,华南稻区5代,每一代都要经历成虫、卵、幼虫和蛹4个阶段,以幼虫在稻根、稻草等处越冬,当第二年气温达11℃时开始化蛹,经历成虫—卵—幼虫,幼虫为害水稻,在分蘖期造成枯鞘(又称“剥壳死”)和枯心苗,
Chilo suppressalis is an important pest of paddy rice. In addition to damaging rice, it also damages many crops such as barley, corn, sorghum, rape, sugarcane, wheat and broad bean and other grass weeds such as reed and barnyard grass. In recent years With the structural adjustment of rural planting industry, the farming system changed, the number of occurrence obviously increased, the harm increased year by year. Chilo suppressalis occurs two generations a year in North China rice fields, occurring in 2-3 generations in the southwest rice region, 3-4 generations in the middle and lower reaches of the Yangtze River, and 5 generations in the South China rice region. Each generation experiences four generations of adults, eggs, larvae and pupae Stage, the larvae overwinter in the rice roots, straw and other places, when the second year when the temperature reached 11 ℃ began to pupate, experience adult - egg - larvae, larvae damage rice, resulting in the tillering dead dull (also known as “peeled ”) And dry heart seedlings,