Nathan Kleczewski, Extension Specialist – Plant Pathology; email@example.com; @Delmarplantdoc
Late blight was reported 5/29 near the North Carolina and Virginia border. Weather has been conducive for disease. A protective fungicide application for late blight protection is recommended. I have included Early Blight P values as well. A P value of 300 is the threshold for early blight fungicide application.
Greenrow – May 1, 2017
|Date||DSV||Total DSV||P Value|
Notes: Season severity of 18 severity values indicates the need for the first fungicide application. An accumulated severity of 7 after fungicide application identifies the need for a subsequent fungicide application. You can personalize your late blight forecasts for specific fields, sign up for email or text alerts, and enter in management information at http://blight.eas.cornell.edu/blight/.
Real time fungicide application timing tables for locations within Delaware can be accessed at http://blight.eas.cornell.edu/blight/DE
See the 2016 Commercial Vegetable Production Recommendations-Delaware for recommended fungicides: http://extension.udel.edu/ag/vegetable-fruit-resources/commercial-vegetable-production-recommendations/
Any suspect samples can be sent to the Plant Diagnostic Clinic or dropped off at your local Extension office. Dr. Nathan Kleczewski can also be contacted at firstname.lastname@example.org or 302-300-6962.
The website USABlight tracks tomato and potato late blight across the nation and can be found here: http://usablight.org/. Information on scouting, symptomology, and management can also be found on this website.