July-August mite scouting frequency adjusted to ERM generation time

Background Information for this page
Return to Apple list for Easthampton MA
Weather data for Easthampton MA.  Forecast values begin September 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 alerts growers to periods of extremely rapid mite reproductive capacity requiring samples every 4 or 5 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 3rd generation eggs is in red, and 4th generation in blue.  Those dates may be in the June ERM sample date table.
     Recommended treatment thresholds change through the summer.  See Background page for definition of "below threshold" and "FAR BELOW threshold".
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"
Resample date
if mite density was
 "FAR BELOW threshold"
Sat, July 1   ---> 6 --->     July 7, Fri July 14, Fri
Sun, July 2   ---> 7 --->     July 9, Sun July 16, Sun
Mon, July 3   ---> 7 --->     July 10, Mon July 16, Sun
Tue, July 4   ---> 7 --->     July 11, Tue July 17, Mon
Wed, July 5   ---> 6 --->     July 11, Tue July 18, Tue
Thu, July 6   ---> 6 --->     July 12, Wed July 18, Tue
Fri, July 7   ---> 6 --->     July 13, Thu July 19, Wed
Sat, July 8   ---> 7 --->     July 15, Sat July 19, Wed
Sun, July 9   ---> 6 --->     July 15, Sat July 20, Thu
Mon, July 10   ---> 6 --->     July 16, Sun July 21, Fri
Tue, July 11   ---> 6 --->     July 17, Mon July 22, Sat
Wed, July 12   ---> 6 --->     July 18, Tue July 23, Sun
Thu, July 13   ---> 5 --->     July 18, Tue July 25, Tue
Fri, July 14   ---> 5 --->     July 19, Wed July 26, Wed
Sat, July 15   ---> 4 --->     July 19, Wed July 27, Thu
Sun, July 16   ---> 4 --->     July 20, Thu July 28, Fri
Mon, July 17   ---> 4 --->     July 21, Fri July 30, Sun
Tue, July 18   ---> 4 --->     July 22, Sat July 31, Mon
Wed, July 19   ---> 6 --->     July 25, Tue August 2, Wed
Thu, July 20   ---> 7 --->     July 27, Thu August 3, Thu
Fri, July 21   ---> 8 --->     July 29, Sat August 5, Sat
Sat, July 22   ---> 9 --->     July 31, Mon August 7, Mon
Sun, July 23   ---> 9 --->     August 1, Tue August 8, Tue
Mon, July 24   ---> 8 --->     August 1, Tue August 9, Wed
Tue, July 25   ---> 7 --->     August 1, Tue August 9, Wed
Wed, July 26   ---> 7 --->     August 2, Wed August 10, Thu
Thu, July 27   ---> 7 --->     August 3, Thu August 11, Fri
Fri, July 28   ---> 6 --->     August 3, Thu August 12, Sat
Sat, July 29   ---> 6 --->     August 4, Fri August 12, Sat
Sun, July 30   ---> 6 --->     August 5, Sat August 13, Sun
Mon, July 31   ---> 7 --->     August 7, Mon August 14, Mon
Tue, August 1   ---> 7 --->     August 8, Tue August 15, Tue
Wed, August 2   ---> 7 --->     August 9, Wed August 17, Thu
Thu, August 3   ---> 7 --->     August 10, Thu August 18, Fri
Fri, August 4   ---> 8 --->     August 12, Sat August 18, Fri
Sat, August 5   ---> 8 --->     August 13, Sun August 19, Sat
Sun, August 6   ---> 8 --->     August 14, Mon August 20, Sun
Mon, August 7   ---> 7 --->     August 14, Mon August 21, Mon
Tue, August 8   ---> 7 --->     August 15, Tue August 21, Mon
Wed, August 9   ---> 7 --->     August 16, Wed August 21, Mon
Thu, August 10   ---> 7 --->     August 17, Thu August 23, Wed
Fri, August 11   ---> 7 --->     August 18, Fri August 24, Thu
Sat, August 12   ---> 6 --->     August 18, Fri August 26, Sat
Sun, August 13   ---> 6 --->     August 19, Sat August 28, Mon
Mon, August 14   ---> 6 --->     August 20, Sun August 30, Wed
Tue, August 15   ---> 6 --->     August 21, Mon No more ERM scouting
Wed, August 16   ---> 5 --->     August 21, Mon  
Thu, August 17   ---> 5 --->     August 22, Tue  
Fri, August 18   ---> 6 --->     August 24, Thu  
Sat, August 19   ---> 7 --->     August 26, Sat  
Sun, August 20   ---> 9 --->     August 29, Tue  
Mon, August 21   ---> 9 --->     August 30, Wed  
Tue, August 22   No more ERM scouting  
Wed, August 23      
Thu, August 24      
Fri, August 25        
Sat, August 26      
Sun, August 27      
Mon, August 28      
end Display