July-August mite scouting frequency adjusted to ERM generation time

Background Information for this page
Return to Apple list for Westhampton MA
Weather data for Westhampton MA.  Forecast values begin September 18, 2018
    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"
Sun, July 1   ---> 3 --->     July 4, Wed July 9, Mon
Mon, July 2   ---> 3 --->     July 5, Thu July 11, Wed
Tue, July 3   ---> 4 --->     July 7, Sat July 13, Fri
Wed, July 4   ---> 5 --->     July 9, Mon July 15, Sun
Thu, July 5   ---> 5 --->     July 10, Tue July 16, Mon
Fri, July 6   ---> 6 --->     July 12, Thu July 17, Tue
Sat, July 7   ---> 6 --->     July 13, Fri July 18, Wed
Sun, July 8   ---> 5 --->     July 13, Fri July 19, Thu
Mon, July 9   ---> 5 --->     July 14, Sat July 20, Fri
Tue, July 10   ---> 5 --->     July 15, Sun July 22, Sun
Wed, July 11   ---> 5 --->     July 16, Mon July 22, Sun
Thu, July 12   ---> 4 --->     July 16, Mon July 23, Mon
Fri, July 13   ---> 5 --->     July 18, Wed July 24, Tue
Sat, July 14   ---> 5 --->     July 19, Thu July 24, Tue
Sun, July 15   ---> 6 --->     July 21, Sat July 26, Thu
Mon, July 16   ---> 6 --->     July 22, Sun July 27, Fri
Tue, July 17   ---> 6 --->     July 23, Mon July 28, Sat
Wed, July 18   ---> 6 --->     July 24, Tue July 29, Sun
Thu, July 19   ---> 5 --->     July 24, Tue July 30, Mon
Fri, July 20   ---> 5 --->     July 25, Wed July 31, Tue
Sat, July 21   ---> 4 --->     July 25, Wed July 31, Tue
Sun, July 22   ---> 4 --->     July 26, Thu August 1, Wed
Mon, July 23   ---> 4 --->     July 27, Fri August 2, Thu
Tue, July 24   ---> 5 --->     July 29, Sun August 3, Fri
Wed, July 25   ---> 5 --->     July 30, Mon August 4, Sat
Thu, July 26   ---> 5 --->     July 31, Tue August 5, Sun
Fri, July 27   ---> 5 --->     August 1, Wed August 6, Mon
Sat, July 28   ---> 5 --->     August 2, Thu August 6, Mon
Sun, July 29   ---> 5 --->     August 3, Fri August 7, Tue
Mon, July 30   ---> 4 --->     August 3, Fri August 8, Wed
Tue, July 31   ---> 4 --->     August 4, Sat August 8, Wed
Wed, August 1   ---> 4 --->     August 5, Sun August 9, Thu
Thu, August 2   ---> 4 --->     August 6, Mon August 11, Sat
Fri, August 3   ---> 4 --->     August 7, Tue August 13, Mon
Sat, August 4   ---> 4 --->     August 8, Wed August 14, Tue
Sun, August 5   ---> 4 --->     August 9, Thu August 15, Wed
Mon, August 6   ---> 4 --->     August 10, Fri August 16, Thu
Tue, August 7   ---> 5 --->     August 12, Sun August 17, Fri
Wed, August 8   ---> 5 --->     August 13, Mon August 19, Sun
Thu, August 9   ---> 6 --->     August 15, Wed August 21, Tue
Fri, August 10   ---> 5 --->     August 15, Wed August 22, Wed
Sat, August 11   ---> 5 --->     August 16, Thu August 23, Thu
Sun, August 12   ---> 5 --->     August 17, Fri August 25, Sat
Mon, August 13   ---> 4 --->     August 17, Fri August 26, Sun
Tue, August 14   ---> 5 --->     August 19, Sun August 26, Sun
Wed, August 15   ---> 6 --->     August 21, Tue August 27, Mon
Thu, August 16   ---> 7 --->     August 23, Thu August 28, Tue
Fri, August 17   ---> 8 --->     August 25, Sat August 29, Wed
Sat, August 18   ---> 8 --->     August 26, Sun August 29, Wed
Sun, August 19   ---> 7 --->     August 26, Sun August 31, Fri
Mon, August 20   ---> 7 --->     August 27, Mon No more ERM scouting
Tue, August 21   ---> 6 --->     August 27, Mon  
Wed, August 22   ---> 6 --->     August 28, Tue  
Thu, August 23   ---> 5 --->     August 28, Tue  
Fri, August 24   ---> 4 --->     August 28, Tue  
Sat, August 25   ---> 4 --->     August 29, Wed  
Sun, August 26   ---> 3 --->     August 29, Wed  
Mon, August 27   ---> 4 --->     August 31, Fri  
Tue, August 28   No more ERM scouting  
end Display