Alternaria Leaf Spot of Houseplants
Alternaria alternata
Houseplants (general)fungal
A common, usually minor fungal leaf spot on stressed or damaged houseplant foliage.
Symptoms
Brown-to-black spots with concentric rings, often starting on older or damaged leaves and spreading in humid conditions.
Cause & development
A generalist opportunistic pathogen documented across a wide range of houseplants. EPPO code ALTEAL.
Favorable conditions
- •Wet foliage and high humidity
- •Plant stress from poor light or irregular watering
- •Physical damage to leaves
Management
- 1Avoid wetting foliage when watering
- 2Remove affected leaves
- 3Improve growing conditions to reduce plant stress
- 4Improve air circulation
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