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

Background Information for this page
Return to radar list for Sanford ME
    Continuous protection from July 3 until 30 days before harvest is recommended.  Flyspeck infections that begin before August 22 are likely to become visible around September 20.  Infections that begin before September 22 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 Sanford ME.  Forecast values begin November 1, 2011
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.)
0.06 Fri, July 1 July 22  (Jul 26) x August 15 (Aug. 27)
0 Sat, July 2 July 23  (Jul 26) x August 16 (Aug. 27)
0.03 Sun, July 3 July 24  (Jul 26) x August 16 (Aug. 27)
0.14 Mon, July 4 July 25  (Jul 28) x August 16 (Aug. 28)
0 Tue, July 5 July 26  (Jul 29) x August 18 (Aug. 31)
0.22 Wed, July 6 July 26  (Jul 29) x August 18 (Aug. 31)
0.01 Thu, July 7 July 26  (Jul 29) x August 18 (Aug. 31)
0.04 Fri, July 8 July 26  (Jul 29) x August 18 (Aug. 31)
0.15 Sat, July 9 July 26  (Jul 29) x August 18 (Aug. 31)
0 Sun, July 10 July 26  (Jul 29) x August 18 (Aug. 31)
0 Mon, July 11 July 26  (Jul 29) x August 18 (Aug. 31)
0 Tue, July 12 July 26  (Jul 29) x August 18 (Aug. 31)
0.62 Wed, July 13 July 26  (Jul 29) x August 18 (Aug. 31)
0.07 Thu, July 14 July 29  (Aug 4) x August 21 (Sep. 4)
0 Fri, July 15 July 29  (Aug 4) x August 21 (Sep. 4)
0 Sat, July 16 July 29  (Aug 4) x August 21 (Sep. 4)
0 Sun, July 17 July 29  (Aug 4) x August 21 (Sep. 4)
0.10 Mon, July 18 July 29  (Aug 4) x August 21 (Sep. 4)
0 Tue, July 19 July 30  (Aug 5) x August 22 (Sep. 5)
0 Wed, July 20 July 30  (Aug 5) x August 22 (Sep. 5)
0 Thu, July 21 July 30  (Aug 5) x August 22 (Sep. 5)
0 Fri, July 22 July 30  (Aug 5) x August 22 (Sep. 5)
0.04 Sat, July 23 July 30  (Aug 5) x August 22 (Sep. 5)
0 Sun, July 24 July 30  (Aug 5) x August 22 (Sep. 5)
0.34 Mon, July 25 July 30  (Aug 5) x August 22 (Sep. 5)
0.93 Tue, July 26 August 7  (Aug 9) x August 28 (Sep. 10)
0 Wed, July 27 August 10  (Aug 14) x September 3 (Sep. 19)
0 Thu, July 28 August 10  (Aug 14) x September 3 (Sep. 19)
0.62 Fri, July 29 August 10  (Aug 14) x September 3 (Sep. 19)
0.33 Sat, July 30 August 15  (Aug 18) x September 6 (Sep. 22)
0 Sun, July 31 August 15  (Aug 18) x September 6 (Sep. 22)