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Grower Services - Degree Days

Year 2016 Accumulations (using base of 50) through June 5th:

  • Lewiston-Auburn: 240 GDD (small caterpillars were found at 76 GDD; mostly cranberry blossomworms)
  • Bar Harbor: 156 GDD
  • Houlton: 208 GDD

Target Numbers (based on Maine averages from 2007 – 2015):

  • Cranberry Tipworm eggs first appearing: ~248 GDD (but crop stage is a more accurate predictor; 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: ~194 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:]


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