Petal Fall - June mite scouting frequency

Background Information for this page
Return to Apple list for Easthampton MA
Weather data for Easthampton MA.  Forecast values begin July 3, 2017
     These estimates of maximum safe intervals between sampling dates for European red mite (ERM) are based on temperature-driven development rate.  The time required for ERM to grow from egg to reproductive adults changes dramatically between cool versus hot temperatures.  Weekly sampling is usually adequate, but is more frequent than needed during cool temperatures.  Knowing the number of days between generations allows growers to reduce sample frequency during cool weather, and during hot weather indicates when intervals between samples may need to be as short as 4 days to detect population increase before foliar damage and tree stress occurs. 
     The resample dates are constrained to require at least one sample during the 7 days before egglaying starts for each generation.  Date for 2nd generation eggs is in green italic font, 3rd generation in red, and 4th generation in blue.  The 3rd and 4th generation egglaying start dates may be in July.
     Recommended treatment thresholds change through the summer.  See Background page for details.
Date on which mites were monitored Number of days before resampling if mite density was
"below threshold"
   Resample date
   if mite density was
   "below threshold"
McIntosh 95% Petal Fall
Sat, May 13   
---> 10 --->     May 23, Tue
Sun, May 14     ---> 9 --->     May 23, Tue
Mon, May 15     ---> 9 --->     May 24, Wed
Tue, May 16     ---> 8 --->     May 24, Wed
Wed, May 17     ---> 11 --->     May 28, Sun
Thu, May 18     ---> 14 --->     June 1, Thu
Fri, May 19     ---> 16 --->     June 4, Sun
Sat, May 20     ---> 16 --->     June 5, Mon
Sun, May 21     ---> 16 --->     June 6, Tue
Mon, May 22     ---> 16 --->     June 7, Wed
Tue, May 23     ---> 16 --->     June 8, Thu
Wed, May 24     ---> 16 --->     June 9, Fri
Thu, May 25     ---> 15 --->     June 9, Fri
Fri, May 26     ---> 14 --->     June 9, Fri
Sat, May 27     ---> 14 --->     June 10, Sat
Sun, May 28     ---> 13 --->     June 10, Sat
Mon, May 29     ---> 12 --->     June 10, Sat
Tue, May 30     ---> 11 --->     June 10, Sat
Wed, May 31     ---> 11 --->     June 11, Sun
Thu, June 1     ---> 10 --->     June 11, Sun
Fri, June 2     ---> 9 --->     June 11, Sun
Sat, June 3     ---> 8 --->     June 11, Sun
Sun, June 4     ---> 8 --->     June 12, Mon
Mon, June 5     ---> 7 --->     June 12, Mon
Tue, June 6     ---> 6 --->     June 12, Mon
Wed, June 7     ---> 5 --->     June 12, Mon
Thu, June 8     ---> 4 --->     June 12, Mon
Fri, June 9     ---> 3 --->     June 12, Mon
Sat, June 10     ---> 4 --->     June 14, Wed
Sun, June 11     ---> 6 --->     June 17, Sat
Mon, June 12     ---> 6 --->     June 18, Sun
Tue, June 13     ---> 7 --->     June 20, Tue
Wed, June 14     ---> 7 --->     June 21, Wed
Thu, June 15     ---> 6 --->     June 21, Wed
Fri, June 16     ---> 6 --->     June 22, Thu
Sat, June 17     ---> 5 --->     June 22, Thu  
Sun, June 18     ---> 5 --->     June 23, Fri  
Mon, June 19     ---> 6 --->     June 25, Sun  
Tue, June 20     ---> 7 --->     June 27, Tue  
Wed, June 21     ---> 7 --->     June 28, Wed  
Thu, June 22     ---> 6 --->     June 28, Wed  
Fri, June 23     ---> 5 --->     June 28, Wed
Sat, June 24     ---> 7 --->     July 1, Sat  
Sun, June 25     ---> 7 --->     July 2, Sun  
Mon, June 26     ---> 6 --->     July 2, Sun  
Tue, June 27     ---> 6 --->     July 3, Mon  
Wed, June 28     ---> 5 --->     July 3, Mon  
Thu, June 29     ---> 5 --->     July 4, Tue  
Fri, June 30     ---> 6 --->     July 6, Thu