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Reference photo — compare the visible signs on your own plant

Fungal & Oomycete · Plant health field guide

Powdery mildew

Powdery mildew produces superficial pale fungal growth on susceptible plants.

Act soonPossible cause—not a diagnosis. Compare the visible signs, plant identity, and growing conditions before treating.

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Signs you may notice

white powder
distorted leaves
surface coating

Safe first checks

Check whether the coating reforms after wiping and compare both leaf surfaces.
Separate the plant if the problem may spread.
Remove only badly affected material with clean tools.
Improve airflow and keep affected foliage dry while you compare the signs.

Can look similar to

Overlapping symptoms are common. Compare these alternatives before choosing a treatment.

mineral residue
mealybugs
downy mildew

What to avoid

Do not assume every spot is infectious or use a disease-specific product without confirming the host and pattern.

Record and follow up

Photograph the same area in consistent light and note whether lesions enlarge, appear on new leaves, or stop after conditions improve.

Seek qualified local help when damage is severe, rapidly spreading, or may involve a regulated pest or disease.