识别与危害Identification & damage
白螟又称顶梢螟，新叶展开后可能出现成排小孔。梢内受害可形成枯心，有时顶端丛生侧芽。
Top borer can leave rows of holes as new leaves unfold. Damage inside the shoot can cause dead hearts and bunchy tops.
来源与传播Origins & spread
成虫可在蔗田间飞移，受害蔗区要连续巡查。雌蛾常呈白色，腹末有橙褐色毛簇。
Moths move between fields; scout affected areas repeatedly. Females are white with a buff-orange tuft at the abdomen tip.
生活史与微观过程Life cycle & microscopic processes
雌蛾常在上部叶背产卵，卵块外面覆盖绒毛。沿叶中脉查卵块，勿把虫卵与泥点混淆。卵孵化后，幼虫先危害幼嫩叶片，再进入梢内。幼虫乳白色、头淡黄，可见细的背线。幼虫沿上部组织钻蛀，蛹室也藏在蛀道内。羽化的成虫进入下一轮产卵，田里可能世代重叠。
Egg clusters on upper leaf undersides are covered with hairs. Inspect near the midrib; distinguish eggs from debris. Hatched larvae damage tender leaves before entering the shoot. Larvae are creamy white with pale heads and a fine dorsal line. Larvae bore through upper tissues and pupate in the tunnel. Emerging adults restart the cycle; generations may overlap.
田间检查与确认Inspection & confirmation
这种枯心往往不易拔出，要结合叶孔和梢部剖查。记录卵块、活虫和受害株，疑似样本送鉴定。
This dead heart is often hard to pull; check leaf holes and the tip. Record eggs, live larvae and damage; submit suspect specimens.
预防、治理与复查Prevention, management & follow-up
选当地抗性适宜的品种，保护本地寄生性天敌。按农技方案处理卵块和带虫梢，减少下一代。幼虫藏进梢内后更难控制，治理要看虫龄。达到当地防治指标，再选登记方法并复查效果。
Use locally resistant cultivars and protect native parasitoids. Manage egg clusters and infested tops with local guidance. Larvae are harder to reach inside shoots; consider their stage. Use local action thresholds, approved methods and follow-up checks.