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Cranberry Management Calendar - July


  • Cranberry Tipworm (overlapping generations and life stages) (especially prevalent if vine growth is excessive)
  • Spanworms
  • Gypsy Moth caterpillars
  • Cranberry Fruitworm egg-hatch
  • False Armyworm larvae (mostly large in size by this time, and thus feeding mostly at night)
  • Some remaining (late) 1st-generation Blackheaded Fireworm larvae (but populations probably mostly pupating during July, with subsequent 2nd-generation caterpillars starting in August)
  • Blunt-nosed Leafhopper ADULTS: First seen in 2009 (two locations – outbreak at one location). This is a sucking insect, though the adults–compared to the developing nymphs–do not feed very much and so are very difficult to control with any insecticides whereby ingestion is the primary mode of action.  In high numbers, leafhoppers will drain the vines significantly (robbing the stems of water and sugar), but most importantly, it is a known carrier of the plant phytoplasm (virus-like pathogen) known as False Blossom, which threatened the entire cranberry industry nationwide in the early 1900s and was so bad in New Jersey that it is said to have nearly ended their cranberry industry there altogether.  Rare pockets of False Blossom are still found in wild bogs on Cape Cod in Massachusetts. You can learn more about this pest on pages 61 to 63 of A.L. Averill & M.M. Sylvia’s book, Cranberry Insects of the Northeast [book can be ordered from the UMass Cranberry Station by clicking here].

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