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Black Spots in Zinnia
verifiedReviewed by the GreenScout Team
Zinnias are bright, heat-loving annuals that bloom in vivid colours all summer
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Zinnia care requirements
These care conditions are most relevant to black spots in Zinnia. Check each one as a potential cause.
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Humidity
Low to moderate.
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Water
Regularly at soil level. Avoid wetting foliage.
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Temperature
21–30°C (70–86°F). No frost.
symptoms
Symptoms to look for in Zinnia
- fiber_manual_recordBlack or dark brown spots
- fiber_manual_recordSpots with yellow halos
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Common causes in Zinnia
- fiber_manual_recordFungal disease (black spot)
- fiber_manual_recordBacterial infection
- fiber_manual_recordSunburn
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How to diagnose black spots in Zinnia
Fungal spots: often circular with yellow margins. Sunburn: irregular bleached patches turning black.
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How to treat black spots in Zinnia
Remove affected leaves. Apply fungicide. Adjust sun exposure.
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Preventing black spots in Zinnia
Avoid wetting foliage. Provide adequate spacing. Remove debris.