Bob Mulrooney, Extension Plant Pathologist; bobmul@udel.edu
Location: Art and Keith Wicks Farm, Rt 9, Little Creek, Kent County.
Greenrow: May 3
| Date |
Late Blight |
Early Blight |
Spray Interval Recommendation |
|
|
DSV |
Total DSV |
Accumulated P-days* |
||
| 6/27 |
1 |
70 |
416 |
10-days |
| 6/28 |
1 |
71 |
424 |
10-days |
| 6/29 |
0 |
71 |
432 |
10-days |
| 6/29-7/2 |
0 |
71 |
456 |
10-days |
| 7/3 |
1 |
72 |
462 |
10-days |
| 7/4 |
0 |
72 |
468 |
10-days |
| 7/5 |
1 |
73 |
474 |
10-days |
| 7/6 |
0 |
73 |
481 |
10-days |
| 7/7 |
3 |
76 |
486 |
7-days |
| 7/8 |
3 |
79 |
493 |
5-days |
| 7/9 |
0 |
79 |
499 |
5-days |
| 7/10 |
0 |
79 |
506 |
5-days |
| 7/11-7/14 |
0 |
79 |
530 |
10-days |
Continue to scout fields for symptoms of late blight. Conditions will continue to favor early blight. The recent rains and the amount of humidity we have been having have made conditions for late blight more favorable. Maintain spray programs if plants are still growing. The shortened spray interval reflects the more favorable conditions and is a very conservative recommendation but with no recent detections, 7-day intervals should be fine.
Late Blight was reported two weeks ago in DE, on the eastern shore VA, and Long Island, New York. There have been no further reports of late blight in DE or VA but late blight has been reported on the North Fork on Long Island, NY in addition to the earlier find on the South Fork.
For specific fungicide recommendations, see the 2011 Delaware Commercial Vegetable Production Recommendations Book.