Late Blight on Tomato Confirmed in Henderson County, NC – June 26, 2017 UPDATE

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Late blight on tomato

Late blight on tomato

Late blight on tomato was confirmed in Henderson County on June 26 and in Buncombe County on June 30. Growers should monitor frequently for symptoms of late blight and begin applying systemic fungicides.

UPDATE (7/12/2017): Samples of afftected tissue from Henderson and Buncombe Counties were both US 23, which is known to be sensitive to mefanoxam. However, to avoid resistance developing in the pathogen, be sure to rotate effective active ingredients.

UPDATE (7/12/2017): Late blight was confirmed in Transylvania County on July 12, 2017.

Tomato and potato are extremely susceptible to this disease and can be significantly defoliated within days if environmental conditions are conducive. Heavy morning dews and cool, wet weather favor this disease. Active scouting and preventive fungicide applications to protect tomato crops in NC from late blight is recommended.

For more information about late blight and how to manage it, see the tomato late blight fact sheet, which lists effective products against late blight.

Control recommendations are also available in the USAblight website, where you can register to receive text and/or email alerts when new disease outbreaks are reported.

If you think you have late blight in your tomatoes, please contact your local Extension Agent and send photos and/or physical samples to the Plant Disease and Insect Clinic. If late blight is confirmed in your samples by an expert, please submit a report to the USAblight website to alert other growers. The USAblight website also contains information about disease identification and control.