Potato Late Blight Update #22: July 29, 2016

Nathan Kleczewski, Extension Specialist – Plant Pathology; nkleczew@udel.edu

This will be the final late blight update for the 2016 season.

Green row: April 29th, 2016

  Townsend Camden Leipsic Kenton
Date DSV Total DSV DSV Total DSV DSV Total DSV DSV Total DSV
6/2-6/6 6 28 4 32 5 36 5 34
6/6-6/9 0 28 0 32 0 36 0 34
6/9-6/15 0 28 0 32 0 36 0 34
6/15-6/24 11 39 5 37 6 42 4 38
6/24-6/30 1 40 0 37 3 45 3 41
6/30-7/5 2 42 2 39 1 46 2 43
7/5-7/8 1 43 0 39 0 46 0 43
7/8-7/11 3 46 2 41 2 48 2 45
7/11-7/14 8 54 2 43 4 52 3 48
7/14-7/19 4 58 2 45 17 69 2 50
7/19-7/21 1 59 0 45 0 69 1 51
7/21-7/24 1 60 1 46 3 71 0 51
7/24-7/29 5 65 3 49 5 76 3 54

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.

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 nkleczew@udel.edu 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.

 

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