Flyspeck prevention, Full-dose Captan or Ziram: August-September spray dates

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