Bob Mulrooney, Extension Plant Pathologist; bobmul@udel.edu
Disease Severity Value (DSV) Accumulation as of August 1, 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* |
| 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 |
| 7/15-7/16 | 1 | 65 | 7-days | 508 |
| 7/17-7/20 | 0 | 65 | 10-days | 526 |
| 7/20-7/21 | 1 | 66 | 10- days | 530 |
| 7/22-7/24 | 0 | 66 | 10-days | 540 |
| 7/25-7/26 | 2 | 68 | 10-days | 552 |
| 7/26-7/28 | 0 | 68 | 10-days | 565 |
| 7/28-7/29 | 1 | 69 | 10-days | 571 |
| 7/29-8/1 | 0 | 69 | 10-days | 597 |
There have been no new reports of late blight in the region since two weeks ago when we reported that late blight was found in a potato field north of Bridgeton, NJ.
If you still have green foliage maintain fungicide applications.
Fortunately late blight has not occurred in DE on potato or tomato as best we know.
This will be the last potato disease advisory for the season. Have a good harvest.
For specific fungicide recommendations, see the 2010 Delaware Commercial Vegetable Production Recommendations Book.