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Grower Services - Degree Days

Target Numbers (based on Maine averages from 2007 – 2016):

  • Cranberry Tipworm eggs first appearing: ~247 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

Cranberry questions? Contact Charles Armstrong, Cranberry Professional. University of Maine Cooperative Extension || Pest Management Unit || 17 Godfrey Drive || Orono, ME 04473-3692 || Tel: 207.581.2967 [email:]


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