NO Late Blight on Tomatoes Reported YET in NC!
Normally growers get very nervous about late blight (Phytophthora infestans) on Tomato, especially in the mountains and especially by this time of the year. Below is the USABlight alert map as of July 3, 2015. The only indication of late blight, and north of Florida, is on potato. In our State, the case of potato late blight in eastern NC is contained and the fields are terminated. The closest report of late blight on tomato to date is in Central Florida reported during the winter crop on January 26, 2015. To our knowledge, late blight has not been observed in tomato fields north of the Florida production region.
However, we would appreciate everyone to be on the lookout for late blight in tomato fields. If suspicious symptoms occur, it should be reported immediately to local extension offices and by sending samples to the Plant Disease and Insect Clinic on campus. If late blight is confirmed by an expert, please send a report to the USAblight website to alert other growers in the region. When late blight appears in your region, growers should be prepared to switch fungicide programs to include products such as chlorothalonil in rotation with Revus Top, Presidio or Ranman and according to published recommendations in the North Carolina Agricultural Chemicals Manual page 532 or the 2015 Southeastern U.S. Vegetable Crop Handbook page 228. Additional information on identification, management, including organic management, and occurrence of the disease can be found at the USAblight website.