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Marigold Flower Blight



Albert,

The marigold problem could also be Choanephora flower blight.  We mostly see this in 
landscape plantings of marigolds in the South - not a major greenhouse problem.  Sounds 
exactly like what you are describing.  Favorable conditions are rainy weather (or 
overhead irrigation) with warm nights.

Allen Owings
LSU Agricultural Center

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