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为害水稻的害虫,约有100多种,其中具有较大经济价值的约20种。在亚洲,螟虫是水稻的最主要害虫,自秧苗期至成熟期,均为害稻株,导致水稻严重减产。1969年,印度稻区受到各种水稻螟虫的侵害,损失约占总产的20％,即大约减产稻谷740万吨。巴基斯坦印度河流域稻产区,也常遭稻螟为害,一般减产20％左右,严重年份达30％以上。印度尼西亚、马来西亚、斯里兰卡、越南、泰国和菲律宾等国,每年均遭三化螟、二化螟等主要稻螟不同程度的为害,有些稻区甚至造成严重歉收
Damage to rice pests, about 100 kinds, of which about 20 kinds of great economic value. In Asia, stem borers are the major pests of rice, and they are all rice plants that have been impacted from the seedling stage to the maturity stage, leading to a serious decrease in rice production. In 1969, Indian rice paddies were hit by various rice stem borers and the loss was about 20% of the total output, or about 7.4 million tons of rice were reduced. In the Indian River Basin, the paddy producing areas of Pakistan are also often damaged by the rice stem borer, which is generally reduced by about 20% and severe years by more than 30%. Indonesia, Malaysia, Sri Lanka, Vietnam, Thailand and the Philippines are all affected by rice borer, Chilo suppressalis and other major rice borer to varying degrees every year, and even some rice areas have caused serious bad harvest