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Grower Services - Insects (Maine Cranberries)

PHOTO Collection Click the photo of a digital camera in order to be taken to our collection of photos of insects found on Maine cranberry beds (for ID purposes)

Insect Pests (of cranberry) Found on Maine Commercial Cranberry Beds (those that are found most often and most consistently):

Cranberry uprights (with a false armyworm larva) (decoration purposes only)

Emerging Insect Pests and/or Pests Less Commonly Encountered on Maine Commercial Cranberry Beds:

  • Potentially a problem in the future (new invasive spanworm pest): Winter Moth [not yet reported or confirmed on any Maine cranberry beds, but it is possible they could show up much more noticeably in the future]. The Bangor Daily reported on this pest on June 5th, 2012: Bangor Daily Story
  • Hill Fireworm Tulsa (=Tlascala) finitella (Wlk.) [encountered only once to date, and only a single larva at that!]
  • Humped Green Fruitworm – Amphipyra pyramidoides (Guenée) [relatively rare but a few of these larvae are usually encountered each year at perhaps 5% of the locations that are monitored statewide, but never–thus far–at threshold levels except when added to False Armyworm counts]
  • Blunt-nosed Leafhopper – Limotettix (=Scleroracus) vaccinii (Van Duzee) [2 sites in 2009 and 3 sites in 2010; very heavy outbreak at 1 of those sites in 2009; mostly low numbers from 2010-2014 but higher numbers as of 2015]
  • Sparganothis Fruitworm – Sparganothis sulfureana (Clemens) [Larvae are rarely detected anymore in commercial Maine cranberry beds, even at organic sites, but moths are captured easily and consistently from year to year whenever pheromone traps are used – though generally not in very high numbers; trap counts are often so low that it is difficult to judge when the peak flight has taken place]
  • Cranberry Girdler – Chrysoteuchia topiaria (Zeller) [larvae have not been found as yet on any Maine cranberry beds whenever searches have been conducted, but the moths are seen commonly]
  • Sawfly larvae – (Action threshold is 30 to 40 per 25 sweeps) variety of Sawfly larvae (4 pictures together, with a note about them, explaining that the distinctive black and yellow one was not found on a cranberry bed but is included as it is such good photo and thus a very good example of the basic body appearance of a sawfly larva)(Found in Maine most often in June) NOTE: Adult is a small, solitary, non-stinging wasp; [Have not ever been found at threshold yet in any Maine commercial cranberry bed, though it was close once in 1999 at one location in eastern Washington County]

see also:

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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