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New Tomato Late Blight Report in Virginia

Posted: August 24, 2016

This week there was a new report of late blight on tomato in Montgomery Co., VA near Blacksburg.
Symptoms and signs of late blight on the lower tomato leaf surface. White spores are how the pathogen spreads between plants and fields (Photo: Beth K. Gugino).

Symptoms and signs of late blight on the lower tomato leaf surface. White spores are how the pathogen spreads between plants and fields (Photo: Beth K. Gugino).

Although there still are no confirmed reports in Pennsylvania, the changing weather and earlier reports from mid-July in Maryland mean that we should still be on the lookout. If you are applying protectant fungicides alone or with products to manage early blight and/or Septoria leaf spot, these will also help manage late blight but thorough coverage is needed.

If you suspect late blight on your farm, please contact your local Penn State Extension Office or let me know via email or by phone at 814-865-7328. We are interested in collecting samples so we can better understand how the pathogen population is changing both within and across growing seasons. Also for the information regarding where the latest confirmed outbreaks have been reported and to receive email or text alerts about when late blight has been confirmed with a personally defined radius from your location visit USABlight.

Contact Information

Beth K. Gugino
  • Associate Professor Vegetable Pathology
Phone: 814-865-7328