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Rust in Geranium (Pelargonium)

How to identify and treat rust in Geranium (Pelargonium).

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Geranium (Pelargonium) care requirements

water
Allow to slightly dry between waterings. Drought-tolerant.
soil
Well-draining potting mix or garden soil.
light
Full sun to partial shade.
symptoms

Symptoms to look for in Geranium (Pelargonium)

Orange-brown, powdery pustules on the undersides of leaves with corresponding yellow spots above, often causing leaf drop in humid conditions.

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Common causes in Geranium (Pelargonium)

Geranium rust spreads via wind-blown spores and is favoured by humid conditions and overhead watering that keeps foliage wet.

healing

How to treat rust in Geranium (Pelargonium)

Remove and destroy infected leaves promptly, and apply a fungicide labelled for rust if the infection is spreading.

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Preventing rust in Geranium (Pelargonium)

Water at the soil level rather than overhead, ensure good airflow, and remove fallen leaves promptly since spores can persist in debris.