Powdery Mildew on Fall Watermelon

Clemson Plant Pathologist Tony Keinath recently found powdery mildew in his fall watermelon plots at the Coastal REC in Charleston.  He says this is the first time he has observed powdery mildew on fall watermelon, and its likely because the weather has been dry.

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Powdery mildew symptoms on watermelon leaf.  Photo from Tony Keinath.

Dr. Keinath stated, “The SC Watermelon Spray Guide for fall watermelon does not include products specifically for powdery mildew. Growers should use Quintec or Torino as preventatives or Torino or Vivando (BASF) if they find PM. The rainy weather on the way may limit PM if it is not too advanced.”  Some areas have received a fair amount of rain in the last few days, but make sure you’re keeping an eye on what’s in your fields.

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