Flyspeck prevention, Group A fungicides:  July spray dates

Background Information for this page
Return to radar list for Monmouth ME
     2nd generation flyspeck spores from border row hosts become available around June 20.  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 20, the estimated end of the 50 wet hour postinfection control window is June 23.
     Flyspeck infection risk increases with development of 3rd generation spores around July 9, and peaks with 4th generation starting around July 30.
     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 Monmouth ME.  Forecast values begin October 7, 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 20 July 22 August 1  (Aug 3)
0 Wed, July 2 July 20 July 22 August 1  (Aug 3)
0.14 Thu, July 3 July 20 July 22 August 1  (Aug 3)
0 Fri, July 4 July 20 July 22 August 1  (Aug 3)
0 Sat, July 5 July 20 July 22 August 1  (Aug 3)
0 Sun, July 6 July 20 July 22 August 1  (Aug 3)
0 Mon, July 7 July 20 July 22 August 1  (Aug 3)
0 Tue, July 8 July 20 July 22 August 1  (Aug 3)
0.19 Wed, July 9 July 20 July 22 August 1  (Aug 3)
0 Thu, July 10 July 20 July 22 August 1  (Aug 3)
0 Fri, July 11 July 20 July 22 August 1  (Aug 3)
0 Sat, July 12 July 20 July 22 August 1  (Aug 3)
0 Sun, July 13 July 20 July 22 August 1  (Aug 3)
0.07 Mon, July 14 July 20 July 22 August 1  (Aug 3)
0 Tue, July 15 July 20 July 22 August 1  (Aug 3)
0 Wed, July 16 July 20 July 22 August 1  (Aug 3)
0 Thu, July 17 July 20 July 22 August 1  (Aug 3)
0.73 Fri, July 18 July 20 July 22 August 1  (Aug 3)
0.20 Sat, July 19 July 21 July 23 August 2  (Aug 4)
1.36 Sun, July 20 July 21 July 23 August 2  (Aug 4)
0.65 Mon, July 21 July 24 July 27 August 5  (Aug 7)
0.01 Tue, July 22 July 24 July 27 August 5  (Aug 7)
0.28 Wed, July 23 July 24 July 27 August 5  (Aug 7)
1.78 Thu, July 24 July 27 July 30 August 6  (Aug 9)
0.17 Fri, July 25 August 1 August 3 August 11  (Aug 14)
0 Sat, July 26 August 1 August 3 August 11  (Aug 14)
0.27 Sun, July 27 August 1 August 3 August 11  (Aug 14)
0 Mon, July 28 August 1 August 3 August 11  (Aug 14)
0.08 Tue, July 29 August 1 August 3 August 11  (Aug 14)
0 Wed, July 30 August 1 August 3 August 11  (Aug 14)
1.36 Thu, July 31 August 1 August 3 August 11  (Aug 14)