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

Background Information for this page
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      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 19.  Apples harvested by October 10 (or by  October 31) should be at low risk if the Protection End Date is after August 30 (or September 5).
     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 Easthampton MA.  Forecast values begin July 16, 2018
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 = 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 15  (Jul. 20) (Aug. 3) August 9 (Aug 23)
0 Mon, July 2 July 16  (Jul. 21) (Aug. 3) August 10 (Aug 24)
0 Tue, July 3 July 17  (Jul. 22) (Aug. 4) August 11 (Aug 26)
0 Wed, July 4 July 17  (Jul. 22) (Aug. 4) August 11 (Aug 26)
0 Thu, July 5 July 17  (Jul. 22) (Aug. 4) August 11 (Aug 26)
0.20 Fri, July 6 July 17  (Jul. 22) (Aug. 4) August 11 (Aug 26)
0 Sat, July 7 July 21  (Jul. 23) (Aug. 5) August 13 (Aug 27)
0 Sun, July 8 July 22  (Jul. 24) (Aug. 6) August 15 (Aug 29)
0 Mon, July 9 July 22  (Jul. 24) (Aug. 6) August 15 (Aug 29)
0 Tue, July 10 July 22  (Jul. 24) (Aug. 6) August 15 (Aug 29)
0 Wed, July 11 July 22  (Jul. 24) (Aug. 6) August 15 (Aug 29)
0 Thu, July 12 July 22  (Jul. 24) (Aug. 6) August 15 (Aug 29)
0 Fri, July 13 July 22  (Jul. 24) (Aug. 6) August 15 (Aug 29)
0 Sat, July 14 July 22  (Jul. 24) (Aug. 6) August 15 (Aug 29)
0.22 Sun, July 15 July 22  (Jul. 24) (Aug. 6) August 15 (Aug 29)
0 Mon, July 16 July 23  (Jul. 24) (Aug. 7) August 17 (Sep 1)
1.13 Tue, July 17 July 23  (Jul. 24) (Aug. 7) August 17 (Sep 1)
0.03 Wed, July 18 July 27  (Jul. 31) (Aug. 12) August 23 (Sep 8)
0 Thu, July 19 July 27  (Jul. 31) (Aug. 12) August 23 (Sep 8)
0 Fri, July 20 July 27  (Jul. 31) (Aug. 12) August 23 (Sep 8)
0 Sat, July 21 July 27  (Jul. 31) (Aug. 12) August 23 (Sep 8)
0.29 Sun, July 22 July 27  (Jul. 31) (Aug. 12) August 23 (Sep 8)
0.48 Mon, July 23 July 29  (Aug. 2) (Aug. 14) August 25 (Sep 10)
0.32 Tue, July 24 August 2  (Aug. 6) (Aug. 18) August 29 (Sep 16)
0.25 Wed, July 25 August 5  (Aug. 9) (Aug. 21) September 2 (Sep 20)
Thu, July 26 August 7  (Aug. 11) (Aug. 23) September 4 (Sep 23)
Fri, July 27 August 8  (Aug. 12) (Aug. 24) September 5 (Sep 25)
  Sat, July 28 August 9  (Aug. 13) (Aug. 25) September 6 (Sep 26)
Sun, July 29 August 10  (Aug. 14) (Aug. 26) September 7 (Sep 28)
Mon, July 30 August 11  (Aug. 15) (Aug. 27) September 9 (Sep 30)
Tue, July 31 August 12  (Aug. 16) (Aug. 28) September 10 (Oct 2)