| Background Information for this page | |||||
| Return to radar list for Hollis NH | |||||
| Weather data for Hollis NH. Forecast values begin September 12, 2012 | |||||
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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 estimate varies 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 April 16, then blossom blight would be noticeable by May 18, and shoot blight by May 27. | |||||
| 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. | |
| McIntosh King Bloom Mon, April 16 |
397 HU, 0.0'', 8 hrs | Caution (if dew) | EXTREME! (if dew) | EXCEPTIONAL! (if dew) | |
| Tue, April 17 | 581 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Wed, April 18 | 583 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Thu, April 19 | 598 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Fri, April 20 | 288 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sat, April 21 | 157 HU, 0.06'', 0 hrs | Caution | Caution | HIGH | |
| Sun, April 22 | 154 HU, 2.11'', 22 hrs | Caution | Caution | HIGH | |
| Mon, April 23 | 143 HU, 0.36'', 24 hrs | Low | Caution | HIGH | |
| Tue, April 24 | 58 HU, 0.0'', 6 hrs | Low | Low | Caution | |
| Wed, April 25 | 7 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Thu, April 26 | 10 HU, 0.23'', 6 hrs | Low | Low | Caution | |
| Fri, April 27 | 7 HU, 0.0'', 9 hrs | Low | Low | Caution | |
| Sat, April 28 | 7 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sun, April 29 | 6 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Mon, April 30 | 6 HU, 0.24'', 0 hrs | Low | Low | Caution | |
| Tue, May 1 | 6 HU, 0.53'', 21 hrs | Low | Low | Caution | |
| Wed, May 2 | 5 HU, 0.13'', 15 hrs | Low | Low | Caution | |
| Thu, May 3 | 4 HU, 0.11'', 22 hrs | Low | Low | Caution | |
| Fri, May 4 | 4 HU, 0.12'', 24 hrs | Low | Low | Caution | |
| Sat, May 5 | 10 HU, 0.0'', 14 hrs | Low | Low | Caution | |
| Sun, May 6 | 16 HU, 0.0'', 5 hrs | Low | Low | Caution | |
| Mon, May 7 | 33 HU, 0.21'', 0 hrs | Low | Low | Caution | |
| Tue, May 8 | 33 HU, 0.40'', 22 hrs | Low | Low | Caution | |
| Wed, May 9 | 38 HU, 0.79'', 24 hrs | Low | Low | Caution | |
| Thu, May 10 | 37 HU, 0.04'', 14 hrs | Low | Low | Caution | |
| Fri, May 11 | 26 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sat, May 12 | 148 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sun, May 13 | 337 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Mon, May 14 | 348 HU, 0.51'', 16 hrs | Caution | HIGH | EXCEPTIONAL! | |
| Tue, May 15 | 368 HU, 0.43'', 20 hrs | Caution | EXTREME! | EXCEPTIONAL! | |
| Wed, May 16 | 279 HU, 0.33'', 22 hrs | Caution | HIGH | EXTREME! | |
| Thu, May 17 | 93 HU, 0.0'', 8 hrs | Low | Low | Caution | |
| Fri, May 18 | 104 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sat, May 19 | 209 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sun, May 20 | 395 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Mon, May 21 | 408 HU, 0.21'', 5 hrs | Caution | EXTREME! | EXCEPTIONAL! | |
| Tue, May 22 | 400 HU, 0.38'', 24 hrs | Caution | EXTREME! | EXCEPTIONAL! | |
| Wed, May 23 | 365 HU, 0.02'', 17 hrs | Caution | EXTREME! | EXCEPTIONAL! | |
| Thu, May 24 | 213 HU, 0.0'', 12 hrs | Caution (if dew) | HIGH (if dew) | EXTREME! (if dew) | |
| Fri, May 25 | 241 HU, 0.0'', 14 hrs | Caution (if dew) | HIGH (if dew) | EXTREME! (if dew) | |
| Sat, May 26 | 566 HU, 0.0'', 11 hrs | HIGH (if dew) | EXCEPTIONAL! (if dew) | EXCEPTIONAL! (if dew) | |
| Sun, May 27 | 630 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Mon, May 28 | 684 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Tue, May 29 | 690 HU, 0.32'', 13 hrs | HIGH | EXCEPTIONAL! | EXCEPTIONAL! | |
| Wed, May 30 | 439 HU, 0.01'', 17 hrs | Caution | EXTREME! | EXCEPTIONAL! | |
| Thu, May 31 | 450 HU, 0.0'', 6 hrs | Caution (if dew) | EXTREME! (if dew) | EXCEPTIONAL! (if dew) | |
| Fri, June 1 | 351 HU, 0.33'', 0 hrs | Caution | HIGH | EXCEPTIONAL! | |
| Sat, June 2 | 299 HU, 1.52'', 20 hrs | Caution | HIGH | EXTREME! | |
| Sun, June 3 | 214 HU, 0.14'', 13 hrs | Caution | HIGH | EXTREME! | |
| Mon, June 4 | 43 HU, 0.38'', 24 hrs | Low | Low | Caution | |
| Tue, June 5 | 21 HU, 0.16'', 16 hrs | Low | Low | Caution | |
| Wed, June 6 | 20 HU, 0.27'', 23 hrs | Low | Low | Caution | |
| Thu, June 7 | 26 HU, 0.30'', 24 hrs | Low | Low | Caution | |
| Fri, June 8 | 101 HU, 0.08'', 21 hrs | Low | Caution | HIGH | |
| Sat, June 9 | 206 HU, 0.0'', 9 hrs | Caution (if dew) | HIGH (if dew) | EXTREME! (if dew) | |
| Sun, June 10 | 384 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Mon, June 11 | 440 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Tue, June 12 | 430 HU, 0.52'', 3 hrs | Caution | EXTREME! | EXCEPTIONAL! | |
| Wed, June 13 | 350 HU, 0.30'', 24 hrs | Caution | HIGH | EXCEPTIONAL! | |
| Thu, June 14 | 224 HU, 0.0'', 10 hrs | Caution (if dew) | HIGH (if dew) | EXTREME! (if dew) | |
| Fri, June 15 | 217 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sat, June 16 | 171 HU, 0.0'', 0 hrs | Low | Low | Low | |
| Sun, June 17 | 169 HU, 0.0'', 2 hrs | Low | Low | Low | |