Fungus Gnats
Fungus gnats are small, dark flies that hover around houseplant soil. While adults are mostly a nuisance, larvae can damage roots in large numbers.
可能原因
Consistently Moist Soil
Why: Fungus gnat larvae feed on organic matter and fungi in moist soil. Wet conditions are essential for their lifecycle.
Signs to check: Soil surface stays moist, tiny black flies around the plant, especially when disturbed.
Rich Organic Potting Mix
Why: Soil high in peat or decomposing organic matter provides abundant food for larvae.
Signs to check: Dense, dark potting mix, flies are more numerous in pots with organic-rich soil.
Poor Drainage
Why: Pots that retain excess water keep soil moist longer, creating ideal breeding conditions.
Signs to check: Water takes a long time to drain, pot lacks drainage holes, saucer holds standing water.
检查要点
- 1Check if the soil surface stays moist between waterings
- 2Count the severity — a few gnats or swarms?
- 3Look for tiny white larvae in the top inch of soil
- 4Check all nearby potted plants, as gnats can infest multiple pots
处理方法
- Let the top 1-2 inches of soil dry out completely between waterings
- Place yellow sticky traps near affected plants to catch adult flies
- Apply a layer of sand or diatomaceous earth on the soil surface to deter egg-laying
- Water from the bottom by placing the pot in a tray of water
- For severe cases, drench soil with a dilute hydrogen peroxide solution (1 part 3% H2O2 to 4 parts water)
何时寻求帮助
- Seedlings or young plants are wilting despite moist soil (root damage from larvae)
- Gnat population is growing despite drying out the soil
- Multiple plants throughout the home are affected
关键要点
Fungus gnats are controlled primarily by managing soil moisture. Let the top layer dry out, use sticky traps, and the population will decline.
在应用中跟踪恢复
记录进度，设置提醒，获取AI诊断。
来源: NC State Extension, Missouri Botanical Garden. 内容根据公开可用的园艺参考资料编写，仅供教育用途。列出来源组织仅为透明度考虑，并不意味着认可。