识别与危害Identification & damage
黄叶病毒感染时，叶背中脉可能先出现黄化。有些感染株没有明显症状，绿叶不等于无病毒。
SCYLV infection may first cause yellowing along the midrib on the underside of a leaf. Some infected plants show no symptoms; green leaves do not establish that a plant is virus-free.
来源与传播Origins & spread
带毒蔗茎用来繁殖，会把病毒传给新植株。检查种苗来源和检测记录，比只看叶色更可靠。蔗蚜等已报道媒介，可以在取食时传播黄叶病毒。传毒能力随种群和条件变化，并非所有蚜虫都一样。
Infected stalk cuttings pass the virus to new plants. Check seedcane origin and test records, not just leaf colour. Reported vectors include sugarcane aphids feeding on cane. Vector ability varies among populations and conditions.
生活史与微观过程Life cycle & microscopic processes
微观图突出韧皮部，这是病毒主要分布的组织。病毒在活细胞中复制，不经历虫卵和蛹的阶段。
This virus is concentrated in phloem tissue. It replicates in living cells, with no egg or pupal stage.
田间检查与确认Inspection & confirmation
翻看不同叶位，记录中脉、叶肉和整株黄化。缺素、环境胁迫和其他病害，都要一起排查。按实验室要求采样，用核酸或适用的免疫检测确认。样本编号要对应田块、品种和种苗批次。
Check several leaf positions; record midrib and blade yellowing. Also assess nutrient stress, the environment and other diseases. Confirm with molecular or suitable immunological tests. Link sample IDs to the field, cultivar and seedcane lot.
预防、治理与复查Prevention, management & follow-up
使用检测合格的种苗，组培脱毒后仍要复检。热水处理不能当成清除黄叶病毒的保证。感染株不再留种，种苗圃结合检测及时处置。防蚜不能治好病毒病，还要持续监测再感染。
Use tested planting stock; retest after meristem culture. Hot-water treatment does not guarantee SCYLV elimination. Stop propagating infected stock; manage nurseries using test results. Aphid control cannot cure virus disease; monitor reinfection.