Flyspeck prevention, Full-dose Pristine: July spray dates

Background Information for this page
Return to Apple list for Westhampton MA
      Continuous protection from roughly 14 days after Petal Fall (May 31) until 30 days before harvest preserves maximum lag between end of protection from the final fungicide application and potential for visible SBFS before harvest. 
      With continuous protection prior to the final fungicide spray, apples harvested by September 20 should be at low risk of visible sooty blotch and flyspeck (SBFS) if the Protection End Date from the final fungicide application is after August 26.  Apples harvested by October 10 (or by  October 31) should be at low risk if the Protection End Date is after September 17 (or September 24).
     These estimates are based on moderate infection pressure and climatic average temperature and rain/wetting hour accumulation.  Block history, local SBFS fungal density, tree size, cultivar, pruning, wind & sun exposure, air drainage, mowing and other site characteristics determine the actual risk of SBFS becoming visible before harvest.
Weather data for Westhampton MA.  Forecast values begin December 31, 2018
Inches Rain Spray Date
Estimates assume that fungicide was applied before rain on spray date
Protection End Date
for full-dose
Pristine
(deadline for postinfection strobilurin or Topsin M)
Date flyspeck infections could appear
(Left side = rough guess of 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 = rough guess of flyspeck show date for small, open canopy, low-risk trees.)
0 Sun, July 1 July 17  (Jul 22) x August 6 (Aug. 16)
0 Mon, July 2 July 17  (Jul 22) x August 6 (Aug. 16)
0 Tue, July 3 July 17  (Jul 22) x August 6 (Aug. 16)
0 Wed, July 4 July 17  (Jul 22) x August 6 (Aug. 16)
0 Thu, July 5 July 17  (Jul 22) x August 6 (Aug. 16)
0.19 Fri, July 6 July 17  (Jul 22) x August 6 (Aug. 16)
0 Sat, July 7 July 22  (Jul 24) x August 9 (Aug. 18)
0 Sun, July 8 July 22  (Jul 24) x August 9 (Aug. 18)
0 Mon, July 9 July 22  (Jul 24) x August 9 (Aug. 18)
0 Tue, July 10 July 22  (Jul 24) x August 9 (Aug. 18)
0 Wed, July 11 July 22  (Jul 24) x August 9 (Aug. 18)
0 Thu, July 12 July 22  (Jul 24) x August 9 (Aug. 18)
0 Fri, July 13 July 22  (Jul 24) x August 9 (Aug. 18)
0 Sat, July 14 July 22  (Jul 24) x August 9 (Aug. 18)
0.22 Sun, July 15 July 22  (Jul 24) x August 9 (Aug. 18)
0 Mon, July 16 July 22  (Jul 24) x August 9 (Aug. 18)
2.28 Tue, July 17 July 22  (Jul 24) x August 9 (Aug. 18)
0 Wed, July 18 July 25  (Jul 27) x August 12 (Aug. 25)
0 Thu, July 19 July 25  (Jul 27) x August 12 (Aug. 25)
0 Fri, July 20 July 25  (Jul 27) x August 12 (Aug. 25)
0 Sat, July 21 July 25  (Jul 27) x August 12 (Aug. 25)
0.98 Sun, July 22 July 25  (Jul 27) x August 12 (Aug. 25)
1.31 Mon, July 23 July 26  (Jul 29) x August 13 (Aug. 28)
0.18 Tue, July 24 August 1  (Aug 3) x August 19 (Sep. 7)
0.85 Wed, July 25 August 1  (Aug 3) x August 19 (Sep. 7)
0.96 Thu, July 26 August 2  (Aug 3) x August 21 (Sep. 9)
0.43 Fri, July 27 August 4  (Aug 7) x August 27 (Sep. 11)
0 Sat, July 28 August 4  (Aug 7) x August 27 (Sep. 11)
0 Sun, July 29 August 4  (Aug 7) x August 27 (Sep. 11)
0 Mon, July 30 August 4  (Aug 7) x August 27 (Sep. 11)
0 Tue, July 31 August 4  (Aug 7) x August 27 (Sep. 11)