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

Background Information for this page
Return to radar list for Hancock NH
Weather data for Hancock NH.  Forecast values begin May 16, 2012
    Continuous protection from June 14 until 30 days before harvest is recommended.  Flyspeck infections that begin before August 19 are likely to become visible around September 20.  Infections that begin before September 3 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 Hancock NH.  Forecast values begin May 16, 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.)
Wed, August 1 Aug. 16  (Aug 20) (Sep. 5) September 15 (Oct. 11)
Thu, August 2 Aug. 17  (Aug 21) (Sep. 6) September 16 (Oct. 14)
Fri, August 3 Aug. 18  (Aug 22) (Sep. 7) September 18 (Oct. 18)
Sat, August 4 Aug. 19  (Aug 23) (Sep. 8) September 19 (Oct. 21)
Sun, August 5 Aug. 20  (Aug 24) (Sep. 9) September 21 (> Oct. 31)
Mon, August 6 Aug. 21  (Aug 25) (Sep. 11) September 22  
  Tue, August 7 Aug. 22  (Aug 26) (Sep. 12) September 24  
Wed, August 8 Aug. 23  (Aug 27) (Sep. 13) September 26  
Thu, August 9 Aug. 24  (Aug 28) (Sep. 14) September 28  
Fri, August 10 Aug. 25  (Aug 29) (Sep. 15) September 30  
Sat, August 11 Aug. 26  (Aug 30) (Sep. 17) October 1  
Sun, August 12 Aug. 27  (Aug 31) (Sep. 18) October 3  
Mon, August 13 Aug. 28  (Sep 1) (Sep. 19) October 6  
  Tue, August 14 Aug. 29  (Sep 2) (Sep. 21) October 8  
Wed, August 15 Aug. 30  (Sep 3) (Sep. 22) October 11  
Thu, August 16 Aug. 31  (Sep 4) (Sep. 23) October 13  
Fri, August 17 Sep. 1  (Sep 5) (Sep. 25) October 16  
Sat, August 18 Sep. 2  (Sep 6) (Sep. 26) October 19  
Sun, August 19 Sep. 3  (Sep 7) (Sep. 28) October 23  
Mon, August 20 Sep. 4 (Sep. 29) > Oct. 31  
  Tue, August 21 Sep. 6   (Oct. 2)    
Wed, August 22 Sep. 7 (Oct. 4)    
Thu, August 23 Sep. 8 (Oct. 6)    
Fri, August 24 Sep. 9 (Oct. 8)    
Sat, August 25 Sep. 10 (Oct. 10)    
Sun, August 26 Sep. 11 (Oct. 12)    
Mon, August 27 Sep. 12 (Oct. 14)    
  Tue, August 28 Sep. 13   (Oct. 17)    
Wed, August 29 Sep. 14 (Oct. 19)    
Thu, August 30 Sep. 15 (Oct. 22)    
Fri, August 31 Sep. 16 (> Oct. 31)    
Sat, September 1 Sep. 17      
Sun, September 2 Sep. 18      
Mon, September 3 Sep. 19      
  Tue, September 4 Sep. 20        
Wed, September 5 Sep. 21      
Thu, September 6 Sep. 22      
Fri, September 7 Sep. 23      
Sat, September 8 Sep. 24      
Sun, September 9 Sep. 25      
Mon, September 10 Sep. 26      
  Tue, September 11 Sep. 27        
Wed, September 12 Sep. 28      
Thu, September 13 Sep. 29      
Fri, September 14 Sep. 30      
Sat, September 15 Oct. 1