Florida vegetable farmers should be wary that late blight disease has been confirmed in tomato in Southwest Florida.
Craig Frey, University of Florida Institute of Food and Agricultural Sciences (UF/IFAS) Hendry County Extension Director Craig Frey, reported via email that Glades Crop Care confirmed the detection, though the race identification is ongoing. The disease can spread quickly and devastate a tomato or potato field within a few weeks if not properly controlled.
Growers should begin a spray program with fungicides if late blight is in your region or if weather conditions are suitable for late blight development. Ideal weather conditions include cool and wet conditions. Temperatures between 50 degrees Fahrenheit (F) and 80 degrees F combined with moist conditions like rain, fog or dew, or relative humidity above 90% are conducive for development.
Growers should scout their fields regularly, since it does not require long periods of time for the disease to develop.
Identification, pictures, and management information from the South Florida Pest and Disease Hotline can be found here: https://mailchi.mp/f49bebfe1e47/late-blight.