Potato Disease Advisory #14 – July 8, 2010

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Bob Mulrooney, Extension Plant Pathologist; bobmul@udel.edu

Disease Severity Value (DSV) Accumulation as of July 7, 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*
6/11-6/12 1 37 7-days 292
6/13-6/14 2 39 7-days 305
6/15-6/16 0 39 7- days 315
6/16-6/17 2 41 7-days 325
6/18-6/20 0 41 7-10 days 354
6/21 0 41 10 days 360
6/22-6/23 1 42 10-days 371
6/24-6/25 0 42 10-days 381
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

There have been no reports of late blight from eastern shore VA, NJ or DE to date. This weather pattern has not been favorable for late blight.

For specific fungicide recommendations, see the 2010 Delaware Commercial Vegetable Production Recommendations Book.