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.
檢查要點
- 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
處理方法
- 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)
何時尋求幫助
- 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
關鍵要點
Fungus gnats are controlled primarily by managing soil moisture. Let the top layer dry out, use sticky traps, and the population will decline.
在應用中跟蹤恢復
記錄進度，設置提醒，獲取AI診斷。
來源: NC State Extension, Missouri Botanical Garden. 內容根據公開可用的園藝參考資料編寫，僅供教育用途。列出來源組織僅為透明度考慮，並不意味著認可。