根腐病是由致病性水霉（主要是腐霉属和疫霉属）引起的植物病害，在积水或缺氧条件下侵袭并分解植物根系。受感染的根部变为棕色或黑色，变得黏滑，失去吸收水分和养分的能力。
关键事实
- Primary pathogens: Pythium and Phytophthora water moulds, often pre-existing in water supplies
- Triggered by: insufficient dissolved oxygen, warm reservoir temperatures, and stagnant water
- Symptoms: brown/black slimy roots, wilting despite adequate water, yellowing leaves
- Prevention: maintain dissolved oxygen with air stones, keep reservoir below 20°C (68°F)
- Treatment: beneficial bacteria (Bacillus subtilis, Trichoderma) can suppress Pythium
- Hydrogen peroxide (3 mL of 3% per litre) can sterilise severely infected reservoirs