Fireblight infection conditions - MaryBlyt model logic

Background Information for this page
Return to radar list for Monmouth ME
Weather data for Monmouth ME.  Forecast values begin August 3, 2008
Shoots near overwintered fireblight cankers would start showing obvious symptoms around  Thursday, June 26
 If canker blight infection spreads to other shoots,
symptoms on those shoots would become obvious around Sunday, July 6
   If fire blight blossom infection occurred on June 12, then blossom blight would be noticeable by June 27, and shoot blight by July 6.
Range of potential
open-blossom dates
Gray box indicates dates when most trees will have lost open blossoms and susceptibility to blossom infection, but late blooming cultivars or young trees may still be susceptible.
Inches Rain,
Leaf Wet Hours,
DH65 heat units, &
Avg. Temperature
Daily fireblight risk rating
as per Maryblyt model criteria
by Dr. Paul Steiner and Gary Lightner. 

In absence of rain, 3 or more hours of leaf wetness counted as possible dew conditions for adequate wetting, which may overstate risk on such days.
Infection requirements:
Any rain, or >0.1 inch rain on previous day,
+ 198 cumulative degree hours > 65F,
+ Average temp. on wetting day >= 60F
Mac King Bloom
Fri, May 16 
  0.'',  0 hrs.,  0 DH,  55F No FB infection
Sat, May 17    0.03'',  6 hrs.,  0 DH,  55F No FB infection
Sun, May 18    0.'',  0 hrs.,  0 DH,  56F No FB infection
Mon, May 19    0.06'',  8 hrs.,  0 DH,  51F No FB infection
Tue, May 20    0.'',  0 hrs.,  0 DH,  52F No FB infection
Wed, May 21    0.13'',  11 hrs.,  0 DH,  53F No FB infection
Thu, May 22    0.05'',  15 hrs.,  0 DH,  50F No FB infection
Fri, May 23    0.09'',  19 hrs.,  0 DH,  52F No FB infection
Sat, May 24    0.'',  8 hrs.,  0 DH,  53F No FB infection
Sun, May 25    0.'',  0 hrs.,  29 DH,  58F No FB infection
Mon, May 26    0.02'',  1 hrs.,  70 DH,  61F No FB infection
Tue, May 27    0.05'',  5 hrs.,  132 DH,  64F No FB infection
Wed, May 28    0.'',  0 hrs.,  88 DH,  52F No FB infection
Thu, May 29    0.'',  0 hrs.,  116 DH,  56F No FB infection
Fri, May 30    0.'',  0 hrs.,  117 DH,  56F No FB infection
Sat, May 31    0.82'',  22 hrs.,  61 DH,  53F No FB infection
Sun, June 1    0.'',  13 hrs.,  104 DH,  62F No FB infection
Mon, June 2    0.02'',  7 hrs.,  86 DH,  60F No FB infection
Tue, June 3    0.2'',  12 hrs.,  84 DH,  61F No FB infection
Wed, June 4    0.3'',  24 hrs.,  56 DH,  55F No FB infection
Thu, June 5    0.05'',  19 hrs.,  57 DH,  58F No FB infection
Fri, June 6    0.19'',  24 hrs.,  27 DH,  54F No FB infection
Sat, June 7    0.'',  14 hrs.,  103 DH,  64F No FB infection
Sun, June 8    0.'',  0 hrs.,  318 DH,  74F No FB infection
Mon, June 9    0.'',  0 hrs.,  531 DH,  74F No FB infection
Tue, June 10    0.65'',  17 hrs.,  598 DH,  71F SEVERE INFECTION RISK
Wed, June 11    0.28'',  11 hrs.,  463 DH,  68F SEVERE INFECTION RISK
Thu, June 12    0.'',  0 hrs.,  294 DH,  63F INFECTION RISK
Fri, June 13    0.'',  0 hrs.,  395 DH,  64F No FB infection
Sat, June 14    0.'',  0 hrs.,  318 DH,  64F No FB infection
Sun, June 15    0.51'',  24 hrs.,  142 DH,  57F No FB infection
Mon, June 16    0.4'',  24 hrs.,  106 DH,  58F No FB infection
Tue, June 17    0.24'',  16 hrs.,  106 DH,  60F No FB infection
Wed, June 18    0.22'',  14 hrs.,  71 DH,  60F No FB infection
Thu, June 19    0.01'',  15 hrs.,  8 DH,  60F No FB infection
Fri, June 20    0.24'',  22 hrs.,  14 DH,  60F No FB infection
Sat, June 21    0.'',  12 hrs.,  57 DH,  63F No FB infection
Sun, June 22    0.7'',  21 hrs.,  81 DH,  62F No FB infection
Mon, June 23    0.12'',  24 hrs.,  98 DH,  64F No FB infection
Tue, June 24    0.15'',  19 hrs.,  149 DH,  65F No FB infection
Wed, June 25    0.'',  8 hrs.,  195 DH,  66F No FB infection
Thu, June 26    0.02'',  1 hrs.,  269 DH,  67F INFECTION RISK