Nathan Kleczewski, Extension Specialist – Plant Pathology; nkleczew@udel.edu
| Date | DSV | Total DSV | Accumulated P-Days | RecommendedSpray Interval |
| 6/27-7/4 | 4 | 79 | 446 | 10-days |
| 7/5-7/11 | 3 | 82 | 492 | 10-days |
| 7/12-7/18 | 7 | 89 | 541 | 7-days |
| 7/19-7/23 | 3 | 92 | 592 | 10-days |
| 7/24-7/31 | 5 | 97 | 643 | 7-days |
| 8/1-8/9 | 23 | 120 | 740 | 7-days |
| 8/10-8/13 | 8 | 128 | 775 | 7-days |
| 8/14-8-21 | 3 | 131 | 837 | 10-days |
| 8/22-8/27 | 8 | 139 | 899 | 7-days |
*Bold text indicates that a preventative fungicide application is recommended. Fungicides are most effective if applied prior to disease development. Follow all label directions regarding application methods, etc. Remember that the label is the law.
Location: Leipsic, Kent Count, Delaware
Green row: May 12, 2013
Any suspect samples can be sent to the UD Plant Diagnostic Lab or dropped off at your local Extension office. See the 2014 Commercial Vegetable Production Recommendations-Delaware for recommended fungicides: http://extension.udel.edu/ag/vegetable-fruit-resources/commercial-vegetable-production-recommendations/.
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.
Late blight map from usablight.org as of 8/28/14