幼虫在蔗茎内取食，形成蛀道、孔口虫粪，有时伴随折茎。症状与其他茎螟可重叠。
Larvae tunnel through stalks, leaving holes and frass; affected stems may break. Similar damage can be caused by other borers.
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症状与危害
DAMAGE AND SYMPTOMS
幼虫在蔗茎内取食，形成蛀道、孔口虫粪，有时伴随折茎。症状与其他茎螟可重叠。
Larvae tunnel through stalks, leaving holes and frass; affected stems may break. Similar damage can be caused by other borers.
来源与传播
ORIGIN AND SPREAD
该虫原生于非洲，甘蔗和部分野生植物都是寄主。追查寄主时也需评估天敌栖息地，不将天然湿地一概视为应清除虫源。
Eldana is native to Africa and uses cane and some wild hosts. Investigate nearby vegetation while also recognizing its role as natural-enemy habitat.
生活史与机理
LIFE CYCLE AND BIOLOGY
卵群可见于干叶褶、叶鞘后和基部干残体；幼虫先在外部取食，再钻茎，最后在蛀道内化蛹。
Egg batches occur in sheltered dry tissue. Larvae feed externally, then enter stems and eventually pupate in their tunnels.
检查与确认
HOW TO INSPECT AND CONFIRM
采用一致的抽样方法，检查叶鞘、孔口及茎内部；记录取样总量、受害茎和活虫，并送交不明虫样鉴定。
Inspect sheaths, holes and dissected stalks with a consistent sampling method. Record sample totals, damaged stalks and live insects; obtain identification when uncertain.
预防、治理与复查
PREVENTION, MANAGEMENT AND FOLLOW-UP
结合适宜抗性品种、合理营养和监测。南非夸祖鲁-纳塔尔沿海五个农场试验支持推拉作为综合防治的一部分，但不构成全球统一植物配方。干预后比较新增危害。
Integrate cultivar resistance, crop nutrition and monitoring. Trials on five coastal KwaZulu-Natal farms support push-pull as one IPM component. This is not a universal planting prescription. Review new damage after intervention.
观察细节 / Look closely
图片为AI教学重建，非实拍标本或显微照片，不按比例；不能单凭图像确诊。 / AI teaching reconstructions, not authenticated specimens or microscopy; not to scale.
参考资料 / References
- BioNET-EAFRINET — Eldana saccharina diagnostic factsheet
- Mulcahy, Conlong & Hill (2023) — On-farm push-pull trials for Eldana in sugarcane
科普教学资料，专家审核尚未完成。管理措施需结合本地诊断和技术指导。 / Educational material; expert review pending. Use local diagnosis and agronomic advice.