| Background Information for this page | |||||
| Return to radar list for Greenville RI | |||||
| Weather data for Greenville RI. Forecast values begin September 20, 2011 | |||||
|
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. |
|||||
| 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! |
|||||
| If blossom infection occurred May 25, then blossom blight would be noticeable by June 1, and shoot blight by June 10. | |||||
| 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 2 |
10 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Tue, May 3 | 25 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Wed, May 4 | 29 HU, 0.36'', 20 hrs | Low | Low | Caution | |
| Thu, May 5 | 31 HU, 0.02'', 9 hrs | Low | Low | Caution | |
| Fri, May 6 | 33 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sat, May 7 | 28 HU, 0.27'', 10 hrs | Low | Low | Caution | |
| Sun, May 8 | 28 HU, 0.0'', 10 hrs | Low | Low | Caution | |
| Mon, May 9 | 38 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Tue, May 10 | 29 HU, 0.08'', 5 hrs | Low | Low | Caution | |
| Wed, May 11 | 24 HU, 0.0'', 13 hrs | Low | Low | Caution | |
| Thu, May 12 | 25 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Fri, May 13 | 22 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sat, May 14 | 25 HU, 0.32'', 9 hrs | Low | Low | Caution | |
| Sun, May 15 | 28 HU, 0.62'', 24 hrs | Low | Low | Caution | |
| Mon, May 16 | 23 HU, 0.49'', 24 hrs | Low | Low | Caution | |
| Tue, May 17 | 15 HU, 0.97'', 24 hrs | Low | Low | Caution | |
| Wed, May 18 | 16 HU, 0.44'', 24 hrs | Low | Low | Caution | |
| Thu, May 19 | 19 HU, 0.81'', 24 hrs | Low | Low | Caution | |
| Fri, May 20 | 32 HU, 0.06'', 22 hrs | Low | Low | Caution | |
| Sat, May 21 | 48 HU, 0.0'', 13 hrs | Low | Low | Caution | |
| Sun, May 22 | 44 HU, 0.10'', 14 hrs | Low | Low | Caution | |
| Mon, May 23 | 44 HU, 0.54'', 22 hrs | Low | Low | Caution | |
| Tue, May 24 | 99 HU, 0.01'', 15 hrs | Low | Low | Caution | |
| Wed, May 25 | 158 HU, 0.0'', 4 hrs | Caution (if dew) | Caution (if dew) | HIGH (if dew) | |
| Thu, May 26 | 232 HU, 0.0'', 9 hrs | Caution (if dew) | HIGH (if dew) | EXTREME! (if dew) | |
| Fri, May 27 | 477 HU, 0.0'', 11 hrs | Caution (if dew) | EXTREME! (if dew) | EXCEPTIONAL! (if dew) | |
| Sat, May 28 | 524 HU, 0.0'', 10 hrs | HIGH (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Sun, May 29 | 656 HU, 0.0'', 12 hrs | HIGH (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Mon, May 30 | 904 HU, 0.0'', 9 hrs | EXTREME! (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Tue, May 31 | 904 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Wed, June 1 | 958 HU, 0.64'', 11 hrs | EXTREME! | EXCEPTIONAL! | EXCEPTIONAL! | |
| Thu, June 2 | 782 HU, 0.0'', 8 hrs | HIGH (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Fri, June 3 | 475 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sat, June 4 | 231 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sun, June 5 | 84 HU, 0.01'', 3 hrs | Low | Low | Caution | |
| Mon, June 6 | 139 HU, 0.0'', 4 hrs | Low | Caution (if dew) | HIGH (if dew) | |
| Tue, June 7 | 472 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Wed, June 8 | 1055 HU, 0.14'', 1 hrs | EXCEPTIONAL! | EXCEPTIONAL! | EXCEPTIONAL! | |
| Thu, June 9 | 1341 HU, 0.73'', 18 hrs | EXCEPTIONAL! | EXCEPTIONAL! | EXCEPTIONAL! | |
| Fri, June 10 | 1366 HU, 0.11'', 11 hrs | EXCEPTIONAL! | EXCEPTIONAL! | EXCEPTIONAL! | |
| Sat, June 11 | 1022 HU, 1.71'', 22 hrs | EXCEPTIONAL! | EXCEPTIONAL! | EXCEPTIONAL! | |
| Sun, June 12 | 433 HU, 0.07'', 24 hrs | Caution | EXTREME! | EXCEPTIONAL! | |
| Mon, June 13 | 140 HU, 0.12'', 13 hrs | Low | Caution | HIGH | |
| Tue, June 14 | 35 HU, 0.04'', 13 hrs | Low | Low | Caution | |
| Wed, June 15 | 80 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Thu, June 16 | 355 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Fri, June 17 | 379 HU, 0.63'', 16 hrs | Caution | EXTREME! | EXCEPTIONAL! | |
| Sat, June 18 | 593 HU, 0.0'', 12 hrs | HIGH (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Sun, June 19 | 652 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Mon, June 20 | 522 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Tue, June 21 | 703 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Wed, June 22 | 533 HU, 1.16'', 21 hrs | HIGH | EXCEPTIONAL! | EXCEPTIONAL! | |
| Thu, June 23 | 440 HU, 0.41'', 24 hrs | Caution | EXTREME! | EXCEPTIONAL! | |
| Fri, June 24 | 301 HU, 0.10'', 24 hrs | Caution | HIGH | EXTREME! | |
| Sat, June 25 | 121 HU, 0.29'', 20 hrs | Low | Caution | HIGH | |
| Sun, June 26 | 182 HU, 0.0'', 13 hrs | Caution (if dew) | Caution (if dew) | HIGH (if dew) | |
| Mon, June 27 | 435 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Tue, June 28 | 706 HU, 0.07'', 6 hrs | HIGH | EXCEPTIONAL! | EXCEPTIONAL! | |
| Wed, June 29 | 935 HU, 0.0'', 11 hrs | EXTREME! (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Thu, June 30 | 1013 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Fri, July 1 | 885 HU, 0.02'', 4 hrs | EXTREME! | EXCEPTIONAL! | EXCEPTIONAL! | |
| Sat, July 2 | 800 HU, 0.0'', 10 hrs | HIGH (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Sun, July 3 | 695 HU, 0.07'', 15 hrs | HIGH | EXCEPTIONAL! | EXCEPTIONAL! | |