Plum curculio protection period

Background Information for this page
Return to Apple list for Easthampton MA
   Need for protection against plum curculio egglaying begins around fruit set. 
    A final plum curculio insecticide application on Tuesday, June 6 is expected to give adequate protection until the end of the immigration period on Sunday, June 11 (indicated by yellow highlight).
If using Surround deterrent, rough estimate for decline in plum curculio egglaying is Saturday, June 24.
Weather data for Easthampton MA.  Forecast values begin August 3, 2017
95% McIntosh Petal Fall estimated or reported as:  May 13,  Saturday
Full-dose
Plum Curculio insecticide
application date
PC degree days accumulated on spray date Inches
Rain
Estimated
end of protection
Percent of
PC control period
(& PC degree days)
completed by end of protection
Sat, May 13   95% McIntosh
Petal Fall
0.73 May 22, Mon 38%   (118) 
Sun, May 14   1 0.64 May 25, Thu 46%   (143) 
Mon, May 15   6 0.29 May 26, Fri 48%   (147) 
Tue, May 16   20 0 May 26, Fri 48%   (147) 
Wed, May 17   42 0 May 26, Fri 48%   (147) 
Thu, May 18   71 0.15 May 26, Fri 48%   (147) 
Fri, May 19   94 0.07 May 29, Mon 56%   (173) 
Sat, May 20   103 0 May 30, Tue 58%   (179) 
Sun, May 21   111 0 May 31, Wed 61%   (189) 
Mon, May 22   114 0.25 May 31, Wed 61%   (189) 
Tue, May 23   123 0 May 31, Wed 61%   (189) 
Wed, May 24   134 0 May 31, Wed 61%   (189) 
Thu, May 25   138 0.52 May 31, Wed 61%   (189) 
Fri, May 26   143 1.06 June 5, Mon 76%   (236) 
Sat, May 27   153 0 June 6, Tue 77%   (236) 
Sun, May 28   166 0 June 6, Tue 77%   (236) 
Mon, May 29   169 0.15 June 6, Tue 77%   (236) 
Tue, May 30   175 0 June 6, Tue 77%   (236) 
Wed, May 31   185 0.57 June 6, Tue 77%   (236) 
Thu, June 1   198 0.03 June 6, Tue 77%   (236) 
Fri, June 2   208 0 June 6, Tue 77%   (236) 
Sat, June 3   217 0 June 6, Tue 77%   (236) 
Sun, June 4   225 0.19 June 6, Tue 77%   (236) 
Mon, June 5   231 0.76 June 6, Tue 77%   (236) 
Tue, June 6   232 1.35 June 16, Fri 100%   (424) 
Wed, June 7   241 0.01 June 19, Mon 100%   (490) 
Thu, June 8   253 0 June 19, Mon 100%   (490) 
Fri, June 9   267 0 June 19, Mon 100%   (490) 
Sat, June 10   287 0 June 20, Tue 100%   (514) 
Sun, June 11   314 0 June 21, Wed 100%   (533)