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

Background Information for this page
Return to radar list for Belchertown MA
    Continuous protection from June 11 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 21, 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.)
Sun, July 1 July 17  (Jul 21) (Aug. 7) August 13 (Aug. 27)
Mon, July 2 July 18  (Jul 22) (Aug. 8) August 14 (Aug. 29)
Tue, July 3 July 19  (Jul 23) (Aug. 9) August 15 (Aug. 30)
Wed, July 4 July 20  (Jul 24) (Aug. 9) August 16 (Aug. 31)
Thu, July 5 July 21  (Jul 25) (Aug. 10) August 17 (Sep. 1)
Fri, July 6 July 22  (Jul 26) (Aug. 11) August 18 (Sep. 2)
  Sat, July 7 July 23  (Jul 27) (Aug. 12) August 19 (Sep. 3)
Sun, July 8 July 24  (Jul 28) (Aug. 13) August 20 (Sep. 4)
Mon, July 9 July 25  (Jul 29) (Aug. 14) August 21 (Sep. 5)
Tue, July 10 July 26  (Jul 30) (Aug. 15) August 22 (Sep. 6)
Wed, July 11 July 27  (Jul 31) (Aug. 16) August 23 (Sep. 8)
Thu, July 12 July 28  (Aug 1) (Aug. 17) August 24 (Sep. 9)
Fri, July 13 July 29  (Aug 2) (Aug. 18) August 25 (Sep. 10)
  Sat, July 14 July 30  (Aug 3) (Aug. 19) August 26 (Sep. 11)
Sun, July 15 July 31  (Aug 4) (Aug. 20) August 27 (Sep. 13)
Mon, July 16 August 1  (Aug 5) (Aug. 21) August 28 (Sep. 14)
Tue, July 17 August 2  (Aug 6) (Aug. 22) August 29 (Sep. 15)
Wed, July 18 August 3  (Aug 7) (Aug. 23) August 30 (Sep. 16)
Thu, July 19 August 4  (Aug 8) (Aug. 24) August 31 (Sep. 18)
Fri, July 20 August 5  (Aug 9) (Aug. 25) September 2 (Sep. 19)
  Sat, July 21 August 6  (Aug 10) (Aug. 26) September 3 (Sep. 21)
Sun, July 22 August 7  (Aug 11) (Aug. 27) September 4 (Sep. 22)
Mon, July 23 August 8  (Aug 12) (Aug. 28) September 5 (Sep. 24)
Tue, July 24 August 9  (Aug 13) (Aug. 29) September 6 (Sep. 26)
Wed, July 25 August 9  (Aug 13) (Aug. 29) September 6 (Sep. 26)
Thu, July 26 August 10  (Aug 14) (Aug. 30) September 7 (Sep. 27)
Fri, July 27 August 11  (Aug 15) (Aug. 31) September 9 (Sep. 29)
  Sat, July 28 August 12  (Aug 16) (Sep. 1) September 10 (Oct. 1)
Sun, July 29 August 13  (Aug 17) (Sep. 2) September 11 (Oct. 3)
Mon, July 30 August 14  (Aug 18) (Sep. 3) September 12 (Oct. 5)
Tue, July 31 August 15  (Aug 19) (Sep. 4) September 14 (Oct. 8)