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二点螟是甘蔗上的主要害虫。在江西省一年发生四代,以老熟幼虫和少数低龄幼虫在宿根蔗蔸、残茎内和秋冬笋枯苗上越冬;在3月下旬至4月下旬化蛹、羽化成虫。成虫在夜晚羽化,活动,白天隐避。产卵期持续4～5天,产200粒左右,一二代产卵在1～4叶的背面。成虫有趋光性,雌雄蛾量比为0.9:1.1。幼虫多在白天的上午从卵中孵出,先在叶面爬行,或垂丝下悬,随风飘动,主要从侧芽处侵入蔗苗,为害心叶,8～10天出现枯心苗。每只幼虫可造成1～3根枯心苗,老熟幼虫在苗内或茎内化蛹。
The borer is a major pest on sugarcane. Four generations occur each year in Jiangxi Province, with mature larvae and a few young larvae overwintering in the dormant cane mulberry, the residual stems and autumn and winter shoots blight; in late March to late April pupation, emergence of adults. Adults emerge at night, activities, during the day to evade. Spawning period lasts 4 to 5 days, producing about 200, a generation of eggs in the back of 1 to 4 leaves. Adults have phototaxis, male and female moth ratio of 0.9: 1.1. Larvae in the daytime morning hatch from the eggs, the first crawling in the leaves, or hanging under the hanging wire, the wind fluttering, mainly from the lateral buds invade the sugarcane seedlings, harming the heart leaves, 8 to 10 days withered seedlings. Each larvae can cause 1 to 3 dead heart seedlings, mature larvae in the seedling or stem pupation.