black rots on marigold blossoms - Knowledgebase Question

Glasgow, MT
Question by cstarrc
April 17, 1999
What causes the black discoloration/rot on the blossoms of marigolds?

Answer from NGA
April 17, 1999


Sounds like Botrytis (gray mold) to me! Gray mold thrives in very humid conditions. If your flowers are plagued with this problem, you'll need to increase air circulation around the plants by thinning them. Or, you can apply a preventive spray of Soap Shield, available from Gardens Alive (812/537-8650; Hope this helps!

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