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Cougarblight Fire Blight
Risk Model
(Version 2001)
Tim Smith, WSU Extension

More information about fire blight :

 

Daily Degree Hour Estimation Look-up Chart

Daytime High Temperature Degree Hours per day if Night low is 49.9F or Lower  Degree Hours per day if Night low is 50F or Higher Daytime High Temperature  Degree Hours per day if Night low is 49.9F or Lower  Degree Hours per day if Night low is 50F or Higher
 60 0 0 83 243 280
 62 2 5 84 257 292
 63 5 12 85 266 302
 64 10 22 86 274 310
 65 14 29 87 280 315
 66 20 35 88 285 320
 67 26 42 89 288 325
68 33 50 90 290 330
69 42 60 92 287 335
70 52 70 93 284 333
71 62 80 94 280 330
72 74 92 95 274 325
73 87 105 96 267 317
74 100 120 97 260 309
75 115 134 98 254 302
76 130 151 99 246 293
77 146 169 100 238 285
78 162 189 101 230 275
79 178 209 102 222 268
80 195 230 103 216 259
81 212 250 104 208 250
82 228 265 105 200 240