Flyspeck prevention, Group A fungicides (strobilurins and Topsin M):  August-September spray dates

Background Information for this page
Return to radar list for Greenville RI
Weather data for Greenville RI.  Forecast values begin October 14, 2011
    Continuous protection from June 13 until 30 days before harvest is recommended.  Flyspeck infections that begin before August 18 are likely to become visible around September 20.  Infections that begin before September 25 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 Greenville RI.  Forecast values begin October 14, 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 Mon, August 1 Aug. 7  (Aug 9) x September 3 (Sep. 19)
0.26 Tue, August 2 Aug. 7  (Aug 9) x September 3 (Sep. 19)
0 Wed, August 3 Aug. 8  (Aug 10) x September 5 (Sep. 21)
0 Thu, August 4 Aug. 8  (Aug 10) x September 5 (Sep. 21)
0 Fri, August 5 Aug. 8  (Aug 10) x September 5 (Sep. 21)
0.09 Sat, August 6 Aug. 8  (Aug 10) x September 5 (Sep. 21)
1.86 Sun, August 7 Aug. 8  (Aug 10) x September 5 (Sep. 21)
0.44 Mon, August 8 Aug. 15  (Aug 18) x September 14 (Sep. 25)
0.86 Tue, August 9 Aug. 15  (Aug 18) x September 14 (Sep. 25)
0.48 Wed, August 10 Aug. 15  (Aug 18) x September 14 (Sep. 25)
0 Thu, August 11 Aug. 15  (Aug 18) x September 14 (Sep. 25)
0 Fri, August 12 Aug. 15  (Aug 18) x September 14 (Sep. 25)
0 Sat, August 13 Aug. 15  (Aug 18) x September 14 (Sep. 25)
0.16 Sun, August 14 Aug. 15  (Aug 18) x September 14 (Sep. 25)
2.26 Mon, August 15 Aug. 15  (Aug 18) x September 14 (Sep. 25)
0.02 Tue, August 16 Aug. 28  (Sep 5) x September 25 (Oct. 3)
0 Wed, August 17 Aug. 28  (Sep 5) x September 25 (Oct. 3)
0 Thu, August 18 Aug. 28  (Sep 5) x September 25 (Oct. 3)
0 Fri, August 19 Aug. 28  (Sep 5) x September 25 (Oct. 3)
0.16 Sat, August 20 Aug. 28  (Sep 5) x September 25 (Oct. 3)
0.18 Sun, August 21 Aug. 28  (Sep 5) x September 25 (Oct. 3)
0.35 Mon, August 22 Aug. 28  (Sep 5) x September 25 (Oct. 3)
0 Tue, August 23 Aug. 28  (Sep 5) x September 25 (Oct. 3)
0 Wed, August 24 Aug. 28  (Sep 5) x September 25 (Oct. 3)
0 Thu, August 25 Aug. 28  (Sep 5) x September 25 (Oct. 3)
0.08 Fri, August 26 Aug. 28  (Sep 5) x September 25 (Oct. 3)
0.68 Sat, August 27 Aug. 28  (Sep 5) x September 25 (Oct. 3)
2.54 Sun, August 28 Aug. 28  (Sep 5) x September 25 (Oct. 3)
0 Mon, August 29 Sep. 7  (Sep 12) x September 29 (Oct. 16)
0 Tue, August 30 Sep. 7  (Sep 12) x September 29 (Oct. 16)
0 Wed, August 31 Sep. 7  (Sep 12) x September 29 (Oct. 16)
0 Thu, September 1 Sep. 7  (Sep 12) x September 29 (Oct. 16)
0 Fri, September 2 Sep. 7  (Sep 12) x September 29 (Oct. 16)
0 Sat, September 3 Sep. 7  (Sep 12) x September 29 (Oct. 16)
0 Sun, September 4 Sep. 7  (Sep 12) x September 29 (Oct. 16)
0 Mon, September 5 Sep. 7  (Sep 12) x September 29 (Oct. 16)
1.68 Tue, September 6 Sep. 7  (Sep 12) x September 29 (Oct. 16)
0.73 Wed, September 7 Sep. 8  (Sep 14) x September 30 (Oct. 18)
2.12 Thu, September 8 Sep. 8  (Sep 14) x September 30 (Oct. 18)
0 Fri, September 9 Sep. 24  (Sep 26) x October 21 (> Oct. 31)
0 Sat, September 10 Sep. 24  (Sep 26) x October 21  
0 Sun, September 11 Sep. 24  (Sep 26) x October 21  
0 Mon, September 12 Sep. 24  (Sep 26) x October 21  
0 Tue, September 13 Sep. 24  (Sep 26) x October 21  
0 Wed, September 14 Sep. 24  (Sep 26) x October 21  
0.28 Thu, September 15 Sep. 24  (Sep 26) x October 21