识别与危害Identification & damage
二点螟主要危害幼蔗，先看心叶是否枯死。这类枯心常能拔出，基部还要查蛀孔和幼虫。
Early shoot borer kills the central shoot of young cane. Check for a dead central shoot (a 'dead heart') that pulls out readily, together with basal entry holes and live larvae.
来源与传播Origins & spread
成虫会飞入蔗田，邻近受害寄主也可能有虫源。查虫源和发生记录，不把所有枯心都判成二点螟。
Moths can enter from nearby infested host plants. Check nearby infestations; dead hearts have several causes.
生活史与微观过程Life cycle & microscopic processes
雌蛾在叶背产卵，扁平的卵互相重叠成行。翻看叶片，用放大镜记录卵块位置和数量。卵孵化成幼虫，幼虫会向嫩组织和茎基部取食。幼虫常呈污白色，体背有深色纵纹。幼虫在蛀道里生长，随后在里面化蛹。成虫羽化后再产卵，发育速度随温度改变。
Females lay overlapping rows of flat eggs under leaves. Turn leaves over; record egg clusters with a hand lens. Hatched larvae feed on tender tissue and bore near the base. Larvae are dirty white with dark longitudinal stripes. Larvae develop and pupate inside their feeding tunnels. New adults lay eggs; development varies with temperature.
田间检查与确认Inspection & confirmation
沿固定路线查苗，记录枯心、活虫和蔗龄。剖查少量疑似株，留虫样请当地人员鉴别。
Scout a fixed route; record dead hearts, live larvae and crop age. Open a few suspect shoots; submit larvae for identification.
预防、治理与复查Prevention, management & follow-up
采用当地适用品种，适时培土，避免幼苗缺水。保护寄生蜂等天敌，诱捕记录用于判断发生。及时处理带虫枯心，结合活虫调查决定治理。需要用药时，按当地登记抓住幼虫钻蛀前。
Use locally suitable cultivars, earthing up and adequate water. Protect natural enemies; use trap records to track activity. Remove infested dead hearts; base action on live-pest scouting. If treatment is needed, use a locally registered product as labelled and target larvae before they bore into the plant.