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二化螟造成早稻和一季中、晚稻苗期枯鞘。枯鞘率在山区一般年份为10％～15‰,严重年份可达30％～40％。局部高达70％～80％。由于二化螟有群集和转株为害习性,大部分枯鞘並不发展成枯心,成为枯心株的一般仅占枯鞘数的14～1.3左右。长期以来人们对二化螟为害损失,都比较注意枯心、白穗所致损失,而很少注意枯鞘对水稻产量的影响,很少考虑将防治桔鞘作为防治环节。
Chilo suppressalis caused by early rice and a season, the late rice seedlings dead sheath. The rate of dry sheath is 10% ~ 15% in the mountainous area and up to 30% ~ 40% in severe years. Local up to 70% to 80%. As the stem borer has cluster and translocation habits, most of the dull sheath does not develop into a dead heart, becoming a withered strain of the general number of dry sheath only about 14 to 1.3. For a long time people harm the stem borer, both pay more attention to dry heart, white spike caused by the loss, and rarely pay attention to the effects of dry sheath on rice yield, rarely consider the prevention and treatment of orange sheath as a control link.