识别与危害Identification & damage
美洲甘蔗螟幼虫钻入蔗茎，蛀道削弱组织。幼蔗可枯心，较大蔗株也可能折断或生长受损。
Sugarcane borer larvae tunnel into and weaken cane stalks. Young shoots may die; older stalks may break or grow poorly.
来源与传播Origins & spread
成虫夜间活动，也利用玉米、高粱等禾本科寄主。查周边寄主和田间虫情，才能追踪可能虫源。
Night-active moths can move among host crops, including maize, sorghum and other grasses. Scout the crop and nearby hosts to locate possible pest sources.
生活史与微观过程Life cycle & microscopic processes
卵常在叶面重叠排列，像一小片鱼鳞。临近孵化时卵色会变化，放大查看更清楚。初孵幼虫先在叶片或叶鞘等部位取食。随后蛀入蔗茎，外部处理就更难接触到它。幼虫在茎内发育并化蛹，预留成虫出口。成虫飞出再产卵，一代多久取决于温度等条件。
Flat eggs overlap on leaves like a small patch of fish scales. Egg colour changes before hatching; inspect with magnification. Young larvae first feed on leaves or around leaf sheaths. They later enter stalks, where treatment reaches them poorly. Larvae develop and pupate in stalks, preparing an exit. Adults emerge and lay eggs; cycle length depends on conditions.
田间检查与确认Inspection & confirmation
检查叶鞘里的小幼虫，并记录蛀孔和受害茎。近似螟虫不只一种，留样鉴定比猜名字可靠。
Check sheaths for small larvae; record holes and damaged stalks. Several borers look alike; identify specimens rather than guess.
预防、治理与复查Prevention, management & follow-up
当地抗性品种和寄生蜂等天敌，可帮助压低虫口。引进或释放天敌，要采用当地认可的种类和方案。防治重点是尚未钻入茎内的小幼虫。结合当地阈值和登记方法，处理后再查活虫。
Locally resistant cultivars and parasitoids help suppress borers. Use locally approved natural enemies and release programmes. Focus control on small larvae before they enter the stalk. Use local thresholds and approved methods; rescout for live larvae.