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Grower Services - Degree Days

Year 2015 Growing Degree Days (GDD) (using a base temperature of 50°F):

Updates through June 3rd, 2015:

  • Lewiston-Auburn: 337 GDD (fireworm was captured at 245 GDD but probably emerged a few days prior, on May 24th or 25th, so 220 GDD at most and possibly closer to 200 GDD)
  • Bangor: 241 GDD
  • Bar Harbor: 141 GDD
  • Jonesport/Jonesboro (Masons Bay): 108 GDD
  • Cherryfield: 184 GDD (newly-hatched fireworm larvae captured in Columbia Falls; target number is 185 so this is ‘spot-on’!)
  • Machias: 78 GDD
  • Houlton: 198 GDD

Updates through May 25, 2015:

  • Lewiston-Auburn: 220 GDD
  • Bangor: 144 GDD
  • Bar Harbor: 82 GDD
  • Jonesport/Jonesboro (Masons Bay):  72 GDD
  • Cherryfield: 108 GDD
  • Machias: 53 GDD
  • Houlton: 93 GDD

Updates through May 17, 2015:

  • Lewiston-Auburn: 155 GDD
  • Bangor: 98 GDD
  • Bar Harbor: 49 GDD
  • Jonesport/Jonesboro (Masons Bay):  46 GDD
  • Cherryfield: 69 GDD
  • Machias: 37 GDD
  • Houlton: 51 GDD

Updates through May 13, 2015:

  • Lewiston-Auburn: 110 GDD
  • Bangor: 76 GDD
  • Bar Harbor: 43 GDD
  • Jonesport/Jonesboro (Masons Bay): 40 GDD
  • Cherryfield: 63 GDD
  • Machias: 33 GDD
  • Houlton: 38 GDD

Target Numbers (based on Maine averages from 2007 – 2014):

Cranberry Tipworm eggs first appearing: ~201 GDD (but crop stage is a much more accurate predictor, I feel; eggs generally appear as soon as tiny new shoots begin to grow up from the runners, and the eggs are deposited almost exclusively on the tips of these tender, new shoots). Black-headed Fireworm larvae first hatching: ~185 GDD


2014 Results:
Cranberry tipworm eggs were first found: June 3rd, at 177 GDD;
Blackheaded fireworm larvae were first found: May 19th, at only 119 GDD;


Questions? Contact Charles Armstrong, Cranberry Professional. University of Maine Cooperative Extension || Pest Management Office || 491 College Avenue || Orono, ME 04473-1295 || Tel: 207.581.2967 [email: charles.armstrong@maine.edu]

 


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