Bob Mulrooney, Extension Plant Pathologist; bobmul@udel.edu
Disease Severity Value (DSV) Accumulation as of July 14, 2010 is as follows:
Location: Art and Keith Wicks Farm, Rt 9, Little Creek, Kent County.
Green row: May 6
| LATE BLIGHT | EARLY BLIGHT | |||
| Date | Daily DSV | Total DSV | Spray Recs | Accumulated P- days* |
| 6/26-6/27 | 0 | 42 | 10-days | 391 |
| 6/28–6/30 | 0 | 42 | 10-days | 408 |
| 7/1–7/5 | 0 | 42 | 10-days | 444 |
| 7/6-7/7 | 0 | 42 | 10-days | 449 |
| 7/8 | 1 | 43 | 10-days | 454 |
| 7/9 | 8 | 51 | 7-days | 462 |
| 7/10 | 0 | 51 | 7-days | 471 |
| 7/11-7/12 | 0 | 51 | 7-days | 484 |
| 7-12-7/13 | 3 | 54 | 7-days | 490 |
| 7/13–7/14 | 10 | 64 | 7-days | 499 |
I am trying to get back on schedule so here is the latest report only two days additional data but the continued rainfall has increased the favorable environment for late blight, if there are any late blight spores anywhere around the region. There have been no reports of late blight from eastern shore VA, NJ or DE to date.
It is important to keep scouting and maintaining fungicide applications at this time.
For specific fungicide recommendations, see the 2010 Delaware Commercial Vegetable Production Recommendations Book.