Powdery MildewIdentification & Treatment Guide 2026
Erysiphe spp. / Podosphaera spp. · Family: Erysiphaceae
Powdery mildew appears as white powdery spots on leaves and stems, caused by Erysiphe or Podosphaera fungi. It thrives in warm, dry weather with high humidity. Manage with sulfur sprays, potassium bicarbonate, neem oil, proper spacing for airflow, and resistant varieties. Unlike most fungal diseases, it does NOT need wet leaves to infect.
Scan This Plant NowQuick Diagnosis
moderatePowdery Mildew
- Affects
- leavesstemsflowersfruit
- Peak Season
- Warm dry weather with cool nights (15-27°C), high humidity but low rainfall
- Spread Risk
- Fast
- Spread By
- Airborne conidia, wind dispersal
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Symptoms: What does Powdery Mildew look like?
Visual identification guide — tap each stage for details
Small white powdery spots on upper leaf surface
Isolated small circular patches of white to grayish-white powdery growth appear, usually on the upper surface of older leaves first.
Spreading white coating covering leaves
Patches expand and merge, covering large areas of leaf surface with dense white mycelium and spore chains. Affected areas may turn slightly yellow beneath the powder.
Leaf browning and premature drop
Heavily infected leaves turn yellow to brown, curl, and drop prematurely. Young shoots and flower buds may be deformed. Fruit quality reduced. Small black fruiting bodies (chasmothecia) may appear in the white coating.
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