| Background Information for this page | |||
| Return to radar list for Sanford ME | |||
| Weather data for Sanford ME. Forecast values begin September 20, 2011 | |||
| 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". |
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| 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" |
| Fri, July 1 | ---> 6 ---> | July 7, Thu | July 10, Sun |
| Sat, July 2 | ---> 6 ---> | July 8, Fri | July 10, Sun |
| Sun, July 3 | ---> 6 ---> | July 9, Sat | July 10, Sun |
| Mon, July 4 | ---> 6 ---> | July 10, Sun | July 16, Sat |
| Tue, July 5 | ---> 6 ---> | July 11, Mon | July 16, Sat |
| Wed, July 6 | ---> 5 ---> | July 11, Mon | July 17, Sun |
| Thu, July 7 | ---> 5 ---> | July 12, Tue | July 18, Mon |
| Fri, July 8 | ---> 5 ---> | July 13, Wed | July 19, Tue |
| Sat, July 9 | ---> 5 ---> | July 14, Thu | July 19, Tue |
| Sun, July 10 | ---> 5 ---> | July 15, Fri | July 20, Wed |
| Mon, July 11 | ---> 5 ---> | July 16, Sat | July 21, Thu |
| Tue, July 12 | ---> 6 ---> | July 18, Mon | July 22, Fri |
| Wed, July 13 | ---> 5 ---> | July 18, Mon | July 22, Fri |
| Thu, July 14 | ---> 5 ---> | July 19, Tue | July 23, Sat |
| Fri, July 15 | ---> 5 ---> | July 20, Wed | July 23, Sat |
| Sat, July 16 | ---> 4 ---> | July 20, Wed | July 25, Mon |
| Sun, July 17 | ---> 4 ---> | July 21, Thu | July 27, Wed |
| Mon, July 18 | ---> 4 ---> | July 22, Fri | July 28, Thu |
| Tue, July 19 | ---> 3 ---> | July 22, Fri | July 29, Fri |
| Wed, July 20 | ---> 3 ---> | July 23, Sat | July 31, Sun |
| Thu, July 21 | ---> 5 ---> | July 26, Tue | August 2, Tue |
| Fri, July 22 | ---> 6 ---> | July 28, Thu | August 5, Fri |
| Sat, July 23 | ---> 7 ---> | July 30, Sat | August 6, Sat |
| Sun, July 24 | ---> 7 ---> | July 31, Sun | August 7, Sun |
| Mon, July 25 | ---> 7 ---> | August 1, Mon | August 8, Mon |
| Tue, July 26 | ---> 7 ---> | August 2, Tue | August 9, Tue |
| Wed, July 27 | ---> 7 ---> | August 3, Wed | August 10, Wed |
| Thu, July 28 | ---> 7 ---> | August 4, Thu | August 11, Thu |
| Fri, July 29 | ---> 7 ---> | August 5, Fri | August 12, Fri |
| Sat, July 30 | ---> 7 ---> | August 6, Sat | August 14, Sun |
| Sun, July 31 | ---> 7 ---> | August 7, Sun | August 16, Tue |
| Mon, August 1 | ---> 7 ---> | August 8, Mon | August 17, Wed |
| Tue, August 2 | ---> 7 ---> | August 9, Tue | August 18, Thu |
| Wed, August 3 | ---> 7 ---> | August 10, Wed | August 19, Fri |
| Thu, August 4 | ---> 7 ---> | August 11, Thu | August 19, Fri |
| Fri, August 5 | ---> 7 ---> | August 12, Fri | August 20, Sat |
| Sat, August 6 | ---> 8 ---> | August 14, Sun | August 22, Mon |
| Sun, August 7 | ---> 8 ---> | August 15, Mon | August 23, Tue |
| Mon, August 8 | ---> 9 ---> | August 17, Wed | August 25, Thu |
| Tue, August 9 | ---> 9 ---> | August 18, Thu | August 26, Fri |
| Wed, August 10 | ---> 8 ---> | August 18, Thu | August 26, Fri |
| Thu, August 11 | ---> 8 ---> | August 19, Fri | August 27, Sat |
| Fri, August 12 | ---> 8 ---> | August 20, Sat | August 28, Sun |
| Sat, August 13 | ---> 8 ---> | August 21, Sun | August 30, Tue |
| Sun, August 14 | ---> 8 ---> | August 22, Mon | August 31, Wed |
| Mon, August 15 | ---> 8 ---> | August 23, Tue | No more ERM scouting |
| Tue, August 16 | ---> 8 ---> | August 24, Wed | |
| Wed, August 17 | ---> 7 ---> | August 24, Wed | |
| Thu, August 18 | ---> 7 ---> | August 25, Thu | |
| Fri, August 19 | ---> 7 ---> | August 26, Fri | |
| Sat, August 20 | ---> 8 ---> | August 28, Sun | |
| Sun, August 21 | ---> 8 ---> | August 29, Mon | |
| Mon, August 22 | ---> 8 ---> | August 30, Tue | |
| Tue, August 23 | ---> 8 ---> | August 31, Wed | |
| Wed, August 24 | No more ERM scouting | ||
| Thu, August 25 | |||
| Fri, August 26 | |||
| Sat, August 27 | |||
| Sun, August 28 | |||
| end Display | |||