Dealing with Black Spots on Daisy Petals: Fungal Infection Management

Dealing with Black Spots on Daisy Petals

Tiny black dots that appear on daisy petals a day or two after the flower opens are typically a sign of a fungal infection rather than insect damage. The spores spread in humid conditions, especially when foliage stays wet.

Cultural Controls

• Water at the base of the plant to keep petals and leaves dry.
• Thin crowded plants to improve air circulation.
• Remove affected blooms promptly to reduce spore load.

Treatment

If cultural practices aren't enough, apply a garden fungicide labeled for ornamental plants (such as those containing chlorothalonil or copper) according to label directions. Begin treatment at the first sign of spots and repeat as needed.

With consistent care, your daisies should stay clean and continue their impressive display.