Bob Mulrooney, Extension Plant Pathologist; bobmul@udel.edu
Disease Severity Value (DSV) Accumulation as of July 15, 2009 is as follows:
Location: Shadybrook Farms, Little Creek, DE in Kent County.
Greenrow: May 1
| LATE BLIGHT | EARLY BLIGHT | |||
| Date | Daily DSV | Total DSV | Spray Recs | Accumulated P-days* |
| 6/24 | 1 | 112 | 7-day interval | 470 |
| 6/25-6/28 | 0 | 112 | 10-day interval | 495 |
| 6/29 | 0 | 112 | 10-day interval | 503 |
| 6/30 | 0 | 112 | 10-day interval | 511 |
| 7/1 | 2 | 114 | 10-day interval | 519 |
| 7/2 | 1 | 115 | 10-day interval | 528 |
| 7/3-7/5 | 0 | 115 | 10-day interval | 555 |
| 7/6-7/8 | 0 | 115 | 10-day interval | 581 |
| 7/9-7/12 | 0 | 115 | 10-day interval | 616 |
| 7/13-7/15 | 0 | 115 | 10-day interval | 641 |
There have been no new late blight reports on potato or tomato from DE since last week. The recent clear days and low humidity are not favorable for new infections. Be sure to keep scouting, especially in those areas where fungicide coverage might not be the best or next to woods lines and places where the dew lingers in the morning, low areas, etc. The weather now is not very favorable for late blight, but continue with preventative fungicides if crop development requires more growing time.