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Black Spots in Dahlia
verifiedReviewed by the GreenScout Team
Dahlias produce some of the most spectacular flowers in the garden from mid-summer until first frost
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Dahlia care requirements
These care conditions are most relevant to black spots in Dahlia. Check each one as a potential cause.
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Humidity
Moderate.
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Water
Regularly and deeply — keep evenly moist.
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Temperature
Not frost hardy. Plant tubers after last frost.
symptoms
Symptoms to look for in Dahlia
- fiber_manual_recordBlack or dark brown spots
- fiber_manual_recordSpots with yellow halos
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Common causes in Dahlia
- fiber_manual_recordFungal disease (black spot)
- fiber_manual_recordBacterial infection
- fiber_manual_recordSunburn
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How to diagnose black spots in Dahlia
Fungal spots: often circular with yellow margins. Sunburn: irregular bleached patches turning black.
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How to treat black spots in Dahlia
Remove affected leaves. Apply fungicide. Adjust sun exposure.
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Preventing black spots in Dahlia
Avoid wetting foliage. Provide adequate spacing. Remove debris.