| Background Information for this page | |||||
| Return to radar list for Sanford ME | |||||
| Weather data for Sanford ME. Forecast values begin September 20, 2011 | |||||
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This table shows estimates of RELATIVE daily fireblight blossom
infection risk based on weather conditions.
Rating criteria are from the Cougarblight 2010 model developed in
Washington and Oregon by Dr. Timothy J. Smith. ABSOLUTE risk depends on the amount of fire blight bacteria in the area, the number of open flowers, and cultivar and rootstock susceptibility. Relative infection risk may be overstated for first few days of bloom because fire blight bacteria may not have been distributed to open flowers. Gray shading indicates dates when most trees will have lost open blossoms, and are therefore no longer susceptible to blossom infection. These dates included for later blooming cultivars and for late-blooming young trees. Absolute risk is much lower on these dates than during full bloom, but apple trees with open blossoms on these dates are susceptible to the risk rating shown. Fireblight infection can occur without rain if there is "heavy" dew. But heavy dew is not defined in weather reports. As a rough guess, if there is no rain on a day, but leaves are expected to be wet for at least 3 hours, then infection risk is reported with "if dew" attached. Infection potential may be overstated on days when the "if dew" tag is attached. |
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| Fire blight risk categories vary by block history: | |||||
| I = No active fire blight within 1 mile of
the orchard this year or last year.
Requires 500 – 800 heat units for HIGH rating, 801 – 1000 for EXTREME!, and
1001+ for EXCEPTIONAL! II = Fire blight was present within 1 mile of the orchard last year, but not currently active in the area this year. Requires 200 – 350 heat units for HIGH rating, 351 – 500 for EXTREME!, and 501+ for EXCEPTIONAL! III = Active fire blight cankers within 1 mile of the orchard this year. Requires 100 – 200 heat units for HIGH rating, 200 – 300 for EXTREME!, and 301+ for EXCEPTIONAL! |
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| If blossom infection occurred May 24, then blossom blight would be noticeable by June 1, and shoot blight by June 16. | |||||
| Range of potential open blossom dates for McIntosh and similar cultivars |
Cougarblight Heat Units, Inches Rain, & Leaf Wet Hours |
I - No
FB within one mile last year or this year |
II - FB within one mile last year, but not active within one mile this year | III - FB active within one mile of orchard this year. | |
| Mac King Bloom Mon, May 16 |
0 HU, 0.25'', 24 hrs | Low | Low | Caution | |
| Tue, May 17 | 0 HU, 0.61'', 24 hrs | Low | Low | Caution | |
| Wed, May 18 | 2 HU, 0.65'', 24 hrs | Low | Low | Caution | |
| Thu, May 19 | 9 HU, 0.43'', 24 hrs | Low | Low | Caution | |
| Fri, May 20 | 17 HU, 0.0'', 24 hrs | Low | Low | Caution | |
| Sat, May 21 | 29 HU, 0.39'', 23 hrs | Low | Low | Caution | |
| Sun, May 22 | 27 HU, 0.13'', 17 hrs | Low | Low | Caution | |
| Mon, May 23 | 25 HU, 0.36'', 23 hrs | Low | Low | Caution | |
| Tue, May 24 | 133 HU, 0.31'', 19 hrs | Low | Caution | HIGH | |
| Wed, May 25 | 169 HU, 0.04'', 10 hrs | Caution | Caution | HIGH | |
| Thu, May 26 | 264 HU, 0.0'', 8 hrs | Caution (if dew) | HIGH (if dew) | EXTREME! (if dew) | |
| Fri, May 27 | 529 HU, 0.0'', 10 hrs | HIGH (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Sat, May 28 | 431 HU, 0.0'', 15 hrs | Caution (if dew) | EXTREME! (if dew) | EXCEPTIONAL! (if dew) | |
| Sun, May 29 | 701 HU, 0.0'', 12 hrs | HIGH (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Mon, May 30 | 940 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Tue, May 31 | 825 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Wed, June 1 | 1050 HU, 0.07'', 4 hrs | EXCEPTIONAL! | EXCEPTIONAL! | EXCEPTIONAL! | |
| Thu, June 2 | 742 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Fri, June 3 | 418 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sat, June 4 | 272 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sun, June 5 | 46 HU, 0.0'', 6 hrs | Low | Low | Caution | |
| Mon, June 6 | 132 HU, 0.0'', 6 hrs | Low | Caution (if dew) | HIGH (if dew) | |
| Tue, June 7 | 325 HU, 0.0'', 2 hrs | Low | Low | Low | |
| Wed, June 8 | 732 HU, 0.0'', 6 hrs | HIGH (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Thu, June 9 | 1033 HU, 0.51'', 10 hrs | EXCEPTIONAL! | EXCEPTIONAL! | EXCEPTIONAL! | |
| Fri, June 10 | 1001 HU, 0.0'', 10 hrs | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Sat, June 11 | 802 HU, 0.86'', 16 hrs | EXTREME! | EXCEPTIONAL! | EXCEPTIONAL! | |
| Sun, June 12 | 389 HU, 0.07'', 24 hrs | Caution | EXTREME! | EXCEPTIONAL! | |
| Mon, June 13 | 81 HU, 0.01'', 15 hrs | Low | Low | Caution | |
| Tue, June 14 | 20 HU, 0.03'', 19 hrs | Low | Low | Caution | |
| Wed, June 15 | 79 HU, 0.0'', 9 hrs | Low | Low | Caution | |
| Thu, June 16 | 424 HU, 0.0'', 2 hrs | Low | Low | Low | |
| Fri, June 17 | 476 HU, 0.21'', 10 hrs | Caution | EXTREME! | EXCEPTIONAL! | |
| Sat, June 18 | 627 HU, 0.38'', 19 hrs | HIGH | EXCEPTIONAL! | EXCEPTIONAL! | |
| Sun, June 19 | 638 HU, 0.0'', 8 hrs | HIGH (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Mon, June 20 | 415 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Tue, June 21 | 563 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Wed, June 22 | 463 HU, 0.88'', 10 hrs | Caution | EXTREME! | EXCEPTIONAL! | |
| Thu, June 23 | 397 HU, 0.50'', 24 hrs | Caution | EXTREME! | EXCEPTIONAL! | |
| Fri, June 24 | 276 HU, 0.79'', 24 hrs | Caution | HIGH | EXTREME! | |
| Sat, June 25 | 80 HU, 0.32'', 24 hrs | Low | Low | Caution | |
| Sun, June 26 | 90 HU, 0.0'', 14 hrs | Low | Low | Caution | |
| Mon, June 27 | 335 HU, 0.0'', 10 hrs | Caution (if dew) | HIGH (if dew) | EXCEPTIONAL! (if dew) | |
| Tue, June 28 | 532 HU, 0.13'', 7 hrs | HIGH | EXCEPTIONAL! | EXCEPTIONAL! | |
| Wed, June 29 | 699 HU, 0.0'', 12 hrs | HIGH (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Thu, June 30 | 716 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Fri, July 1 | 552 HU, 0.06'', 10 hrs | HIGH | EXCEPTIONAL! | EXCEPTIONAL! | |
| Sat, July 2 | 515 HU, 0.0'', 10 hrs | HIGH (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Sun, July 3 | 418 HU, 0.03'', 14 hrs | Caution | EXTREME! | EXCEPTIONAL! | |
| Mon, July 4 | 663 HU, 0.14'', 21 hrs | HIGH | EXCEPTIONAL! | EXCEPTIONAL! | |
| Tue, July 5 | 1024 HU, 0.0'', 10 hrs | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Wed, July 6 | 1301 HU, 0.23'', 7 hrs | EXCEPTIONAL! | EXCEPTIONAL! | EXCEPTIONAL! | |
| Thu, July 7 | 1470 HU, 0.0'', 10 hrs | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Fri, July 8 | 1214 HU, 0.19'', 2 hrs | EXCEPTIONAL! | EXCEPTIONAL! | EXCEPTIONAL! | |
| Sat, July 9 | 973 HU, 0.0'', 10 hrs | EXTREME! (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Sun, July 10 | 833 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Mon, July 11 | 1275 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Tue, July 12 | 1829 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Wed, July 13 | 1855 HU, 0.69'', 10 hrs | EXCEPTIONAL! | EXCEPTIONAL! | EXCEPTIONAL! | |
| Thu, July 14 | 1629 HU, 0.0'', 9 hrs | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Fri, July 15 | 1153 HU, 0.0'', 2 hrs | Low | Low | Low | |
| Sat, July 16 | 937 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sun, July 17 | 1385 HU, 0.0'', 0 hrs | Low | Low | Low | |