Late blight update

Previous 2012 late blight updates: May 31June 4July 20July 27,  July 30August 16, August 21.

Agriculture and Agri-Food Canada have confirmed the diagnosis of late blight on tomato plants from Chatham-Kent.  Several new reports of late blight have been coming in from nearby states as well this week as conditions have become more favourable for the disease.  Tomato growers in Chatham-Kent and other regions of southern Ontario should monitor their fields closely, although growers following a recommended fungicide program for early blight, septoria leaf spot, and anthracnose, do have a level of protection with most of the common fungicides.  See the August 21 update for information on recommended fungicides.

Recent US late blight reports:

  • August 22 – Washington County, NY (tomato)
  • August 22 – New Haven County, CT (tomato)
  • August 21 – Fulton County, NY (tomato)
  • August 21 – Tompkins County, NY (tomato)
  • August 20 – Ulster County, NY (tomato)
  • August 16 – Centre County, PA (potato)

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