Flyspeck prevention with Group A fungicides (strobilurins and Topsin M): July spray dates

Background Information for this page
Return to radar list for Hollis NH
    Continuous protection from June 4 until 30 days before harvest is recommended.  Flyspeck infections that begin before August 5 are likely to become visible around September 20.  Infections that begin before September 9 are likely to become visible around October 20.  But warm wet weather in September can accelerate flyspeck development resulting in earlier dates of flyspeck appearance before harvest.
     Application a strobilurin or Topsin M fungicide within 50 wet hours after the 'Protection end date' of the previous fungicide application may provide postinfection control.
Weather data for Hollis NH.  Forecast values begin November 1, 2012
Inches Rain Spray Date
Estimates assume that fungicide was applied before rain on spray date
Protection End Date
for full-dose
Flint, Sovran, or
Topsin M
(deadline for postinfection strobilurin or Topsin M)
Date flyspeck infections could appear
(Left side = estimated flyspeck show date if weather beyond end of forecast range is in top 20% of years for both temperature and wet hours.  An "x" means there is no need for this scenario because show date is within forecast range.
    
Right side = estimated flyspeck show date for small, open canopy, low-risk trees.)
0 Sun, July 1 July 22  (Jul 26) x August 19 (Sep. 17)
0.02 Mon, July 2 July 23  (Jul 26) x August 20 (Sep. 17)
0 Tue, July 3 July 24  (Jul 27) x August 23 (Sep. 18)
0.45 Wed, July 4 July 25  (Jul 27) x August 23 (Sep. 18)
0 Thu, July 5 July 26  (Jul 27) x August 26 (Sep. 21)
0 Fri, July 6 July 27  (Jul 29) x September 1 (Sep. 26)
0 Sat, July 7 July 28  (Jul 31) x September 4 (Sep. 28)
0 Sun, July 8 July 29  (Aug 1) x September 5 (Sep. 29)
0 Mon, July 9 July 30  (Aug 2) x September 7 (Sep. 30)
0 Tue, July 10 July 31  (Aug 3) x September 9 (Oct. 1)
0 Wed, July 11 August 1  (Aug 5) x September 12 (Oct. 2)
0 Thu, July 12 August 1  (Aug 5) x September 12 (Oct. 2)
0 Fri, July 13 August 1  (Aug 5) x September 12 (Oct. 2)
0 Sat, July 14 August 1  (Aug 5) x September 12 (Oct. 2)
0.06 Sun, July 15 August 1  (Aug 5) x September 12 (Oct. 2)
0 Mon, July 16 August 1  (Aug 5) x September 12 (Oct. 2)
0 Tue, July 17 August 1  (Aug 5) x September 12 (Oct. 2)
0.19 Wed, July 18 August 1  (Aug 5) x September 12 (Oct. 2)
0 Thu, July 19 August 1  (Aug 5) x September 12 (Oct. 2)
0 Fri, July 20 August 1  (Aug 5) x September 12 (Oct. 2)
0 Sat, July 21 August 1  (Aug 5) x September 12 (Oct. 2)
0 Sun, July 22 August 1  (Aug 5) x September 12 (Oct. 2)
0.07 Mon, July 23 August 1  (Aug 5) x September 12 (Oct. 2)
0.23 Tue, July 24 August 1  (Aug 5) x September 12 (Oct. 2)
0 Wed, July 25 August 4  (Aug 8) x September 16 (Oct. 3)
0.16 Thu, July 26 August 4  (Aug 8) x September 16 (Oct. 3)
0.10 Fri, July 27 August 4  (Aug 8) x September 16 (Oct. 3)
0.66 Sat, July 28 August 4  (Aug 8) x September 16 (Oct. 3)
0.05 Sun, July 29 August 9  (Aug 10) x September 24 (Oct. 11)
0 Mon, July 30 August 9  (Aug 10) x September 24 (Oct. 11)
0.22 Tue, July 31 August 9  (Aug 10) x September 24 (Oct. 11)