识别与危害Identification & damage
种下后迟迟缺苗，要挖出种茎，看看切口和内部是否腐烂。凤梨病是真菌性种茎腐烂，不是甘蔗长出了凤梨果实。
When emergence fails, uncover setts and inspect cut ends and internal rot. Pineapple disease is a fungal rot of planting setts.
来源与传播Origins & spread
土中的病原可从切口或裂伤侵入，损伤多的种茎风险更高。病原学名存在新旧写法，本片采用画面中显示的现用名称。
Soilborne fungi enter cut ends or cracks; damaged setts are vulnerable. The pathogen is referred to here as Thielaviopsis paradoxa; sources may also use other names.
生活史与微观过程Life cycle & microscopic processes
微观图显示菌丝从伤口向内扩展，腐烂随后影响种茎萌发。组织可先发红，随后内部发黑，黑色部分包含大量真菌孢子。冷土、过干或过湿使萌发变慢，给种茎腐烂留下更多机会。所以要同时查土壤条件，不能只把缺苗归咎于种茎好坏。
Fungal hyphae extend inward from wounds as decay develops. Tissue may redden then blacken internally as fungal spores accumulate. Cold, dry or excessively wet soil delays emergence and favours sett decay. Inspect soil conditions as well as planting-stock quality when tracing gaps.
田间检查与确认Inspection & confirmation
剖开新近受害种茎，记录红黑范围，并与健康材料比较。资料提到凤梨样气味，但气味不能单独确诊，也不要贴近嗅闻。尽早按要求送检病健交界，腐烂太久会混入其他微生物。同时记录切种损伤、播期和水分，找出能改进的环节。
Split recently affected setts and compare discoloured areas with sound material. A fruity odour is reported, but smell alone is not diagnostic. Submit fresh lesion margins early; advanced decay can contain other microbes. Record cutting damage, planting time and moisture to identify preventable problems.
预防、治理与复查Prevention, management & follow-up
选用健康完整种茎，减少碰伤，安排适宜的土温和水分。需用种茎处理剂时，按当地标签操作并检查切端覆盖是否完整。已经严重腐烂的种茎不能靠追肥恢复，应评估补植或重种。后续复查出苗和新增腐烂，把种茎质量与操作记录一并保存。
Use sound setts, minimise injury and plant in suitable soil conditions. When indicated, follow local sett-treatment labels and check cut-end coverage. Fertiliser cannot restore rotten setts; assess gap filling or replanting. Recheck emergence and new decay, retaining planting-stock and handling records.