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

Background Information for this page
Return to radar list for Monmouth ME
    Continuous protection from June 17 until 30 days before harvest is recommended.  Risk of new flyspeck infections increases around July 10, and increases again around July 29.
     Flyspeck infections that begin before August 23 are likely to become visible around September 20.  Infections that begin before September 4 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.
     Postinfection control of flyspeck may occur with application a strobilurin or Topsin M fungicide within 50 wet hours after the 'Protection end date' of the previous fungicide application.
Weather data for Monmouth ME.  Forecast values begin September 8, 2010
Inches Rain Spray Date
- assumes that fungicide was applied before any rain fell on spray date
Protection End Date
for full-dose
Pristine,
Flint, Sovran, or Topsin M
(deadline for postinfection strobilurin or Topsin M)
Date flyspeck infections that started after end of protection could appear
(Left side = rough estimate of flyspeck show date for dense canopy trees if weather beyond forecast range is in top 20% of years for both temperature and wet hours.
x = show date is within forecast range.

Right side = rough estimate of flyspeck show date for small, open canopy, low-risk trees.)
0.28 Thu, July 1 Jul 14 (July 17) x August 6 (Aug 21)
0 Fri, July 2 Jul 21 (July 24) x August 16 (Sep 2)
0 Sat, July 3 Jul 21 (July 24) x August 16 (Sep 2)
0 Sun, July 4 Jul 21 (July 24) x August 16 (Sep 2)
0 Mon, July 5 Jul 21 (July 24) x August 16 (Sep 2)
0 Tue, July 6 Jul 21 (July 24) x August 16 (Sep 2)
0 Wed, July 7 Jul 21 (July 24) x August 16 (Sep 2)
0 Thu, July 8 Jul 21 (July 24) x August 16 (Sep 2)
0 Fri, July 9 Jul 21 (July 24) x August 16 (Sep 2)
0.48 Sat, July 10 Jul 21 (July 24) x August 16 (Sep 2)
0.43 Sun, July 11 Jul 21 (July 24) x August 16 (Sep 2)
0 Mon, July 12 Jul 21 (July 24) x August 16 (Sep 2)
0.10 Tue, July 13 Jul 21 (July 24) x August 16 (Sep 2)
0.73 Wed, July 14 Jul 21 (July 24) x August 16 (Sep 2)
0 Thu, July 15 Jul 25 (August 2) x August 22 (Sep 7)
0 Fri, July 16 Jul 25 (August 2) x August 22 (Sep 7)
0.02 Sat, July 17 Jul 25 (August 2) x August 22 (Sep 7)
0 Sun, July 18 Jul 25 (August 2) x August 22 (Sep 7)
0.01 Mon, July 19 Jul 25 (August 2) x August 22 (Sep 7)
0 Tue, July 20 Jul 25 (August 2) x August 22 (Sep 7)
1.42 Wed, July 21 Jul 25 (August 2) x August 22 (Sep 7)
0.15 Thu, July 22 Aug 4 (August 8) x August 29 (Sep 12)
0 Fri, July 23 Aug 4 (August 8) x August 29 (Sep 12)
0.25 Sat, July 24 Aug 4 (August 8) x August 29 (Sep 12)
0.75 Sun, July 25 Aug 4 (August 8) x August 29 (Sep 12)
0 Mon, July 26 Aug 16 (August 22) x September 12 (Oct 10)
0 Tue, July 27 Aug 16 (August 22) x September 12 (Oct 10)
0.02 Wed, July 28 Aug 16 (August 22) x September 12 (Oct 10)
0.16 Thu, July 29 Aug 16 (August 22) x September 12 (Oct 10)
0 Fri, July 30 Aug 20 (August 24) (Sep 15) September 15 (Oct 23)
0 Sat, July 31 Aug 21 (August 24) (Sep 15) September 15 (Oct 23)