Flyspeck prevention, Group A fungicides:  July spray dates

Background Information for this page
Return to radar list for Greenville RI
     2nd generation flyspeck spores from border row hosts become available around June 21.  Beyond that date preventive or postinfection flyspeck control is advised up until 30 days before the end of harvest.
     Postinfection control of flyspeck requires application of a strobilurin or Topsin M fungicide within 50 wet hours after the 'Protection end date' of the previous fungicide application.  For flyspeck infections starting on unprotected apples on June 21, the estimated end of the 50 wet hour postinfection control window is June 24.
     Flyspeck infection risk increases with development of 3rd generation spores around July 24, and peaks with 4th generation starting around August 13.
     If the 'Protection End Date' is within 30 days of final harvest, then flyspeck infections that start after protection wears off will only have enough development time to become visible on fruit if unusually wet weather allows an additional 270+ cumulative wet hours before harvest.
Weather data for Greenville RI.  Forecast values begin September 2, 2008
Inches Rain Spray Date
- assumes that fungicide was applied before any rain recorded on spray date
Protection End Date
for Flint, Pristine, Sovran,
or Topsin M
applied on spray date
Deadline for
postinfection strobilurin or
Topsin M application
(= 50 wet hours after protection ends)
Latest Safe Storage
(& Fresh pick)
Harvest Dates with low Flyspeck risk
- Storage date assumes fruit will be cool and dry within 50 hours after harvest
0 Tue, July 1 July 21 July 23 August 7  (Aug 10)
0.67 Wed, July 2 July 21 July 23 August 7  (Aug 10)
0 Thu, July 3 July 22 July 24 August 7  (Aug 11)
0.31 Fri, July 4 July 22 July 24 August 7  (Aug 11)
0.25 Sat, July 5 July 23 July 26 August 10  (Aug 12)
0 Sun, July 6 July 23 July 26 August 10  (Aug 12)
0 Mon, July 7 July 23 July 26 August 10  (Aug 12)
0 Tue, July 8 July 23 July 26 August 10  (Aug 12)
0 Wed, July 9 July 23 July 26 August 10  (Aug 12)
0 Thu, July 10 July 23 July 26 August 10  (Aug 12)
0 Fri, July 11 July 23 July 26 August 10  (Aug 12)
0 Sat, July 12 July 23 July 26 August 10  (Aug 12)
0 Sun, July 13 July 23 July 26 August 10  (Aug 12)
0.10 Mon, July 14 July 23 July 26 August 10  (Aug 12)
0 Tue, July 15 July 23 July 26 August 10  (Aug 12)
0 Wed, July 16 July 23 July 26 August 10  (Aug 12)
0 Thu, July 17 July 23 July 26 August 10  (Aug 12)
0.09 Fri, July 18 July 23 July 26 August 10  (Aug 12)
0 Sat, July 19 July 23 July 26 August 10  (Aug 12)
0.10 Sun, July 20 July 23 July 26 August 10  (Aug 12)
0.60 Mon, July 21 July 23 July 26 August 10  (Aug 12)
0.66 Tue, July 22 July 23 July 26 August 10  (Aug 12)
1.52 Wed, July 23 July 24 July 30 August 11  (Aug 14)
2.71 Thu, July 24 July 24 July 30 August 11  (Aug 14)
0 Fri, July 25 August 2 August 6 August 18  (Aug 30)
0 Sat, July 26 August 2 August 6 August 18  (Aug 30)
1.57 Sun, July 27 August 2 August 6 August 18  (Aug 30)
0 Mon, July 28 August 7 August 10 September 6  (Sep 9)
0 Tue, July 29 August 7 August 10 September 6  (Sep 9)
0 Wed, July 30 August 7 August 10 September 6  (Sep 9)
0.23 Thu, July 31 August 7 August 10 September 6  (Sep 9)