Borer (Longhorn Beetle Larva)
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关于这种疾病
Borers are larvae of longhorn beetles that tunnel inside trunks and thick branches, making them difficult to detect from outside. By the time they are noticed, damage to the tree can be substantial. They affect many bonsai species including pine, cherry, and maple.
主要症状
- Frass (sawdust-like or wood-chip-like excrement) accumulates at the trunk base or branch joints
- Circular entry holes several millimeters in diameter are visible on the trunk
- Sections of foliage suddenly wilt and die back
- Tunnels from larval feeding are present inside the trunk
主要原因
- Egg-laying by adult longhorn beetles, primarily in early to midsummer
- Oviposition in damaged bark or cut surfaces from pruning
- Concentrated infestation on trees with reduced vigor or older, weakened specimens
- Proximity to other host plants of longhorn beetles in the surrounding area
预防（栽培环境与日常管理）
Inspect trunks and branches regularly for frass or entry holes to ensure early detection. Treat pruning cuts appropriately to prevent decay that can attract egg-laying adults. Maintain tree vigor through consistent watering, balanced fertilization, and proper formative pruning.
相关图鉴
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尽快处理（隔离、去除诱因）专卖店·园艺可做的处理？
Specialist bonsai nurseries and growers can assess the extent of damage, help confirm larval presence, and advise on care practices and environmental adjustments to support the tree's recovery.
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