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CRANBERRIES
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Chain-spotted Geometer
Order: Lepidoptera || Family: Geométridae
Cingilia catenaria (Drury)

     This is, to-date, a relatively rare pest to turn up in your Maine cranberry sweep catches. It is seen occasionally in New Jersey as well, and even less often in Massachusetts. Severe local outbreaks occurred on cranberry in Cape Cod in 1927 and 1934, but in more recent times its numbers have declined such that it even appeared on the Massachusetts endangered species at one time (Averill & Sylvia. Cranberry Insects of the Northeast. p. 32). According to W. L. Baker in a miscellaneous USDA Forest Service publication of 1972 entitled Eastern Forest Insects, this larva prefers blueberries, huckleberries, and small trees growing in pastures or cut-over areas. But it will certainly feed on cranberry, too.
     Description: Yellow to straw-colored with round black spots on various parts of their bodies. There is a row of conspicuous white spots along each side of the body, mostly above the spiracles. Most of these spots are bordered with one black spot in front and another behind. When full grown, they are about 1.5 to 2 inches long, and as they mature they have the habit of hanging straight downward, motionless, during the day. They feed mainly in the early evening and into the night. The pupal stage lasts about a month and the moths appear in September and very early October (Averill & Sylvia. Cranberry Insects of the Northeast. p. 33). 

Chainspotted Geometer larva (in Maine)chainspotted geometer (Maine)
Chainspotted geometer larva
(first noticed in Maine during the 2002 season--month of July--and only one was found)
(Photos by Charlie Armstrong)
chainspotted geometer moth beside a US dime
Chainspotted geomter moth (Sept. 18th)
They can be seen fluttering over the vines in September, which is their mating time and egg-laying time.


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contact Charles Armstrong at: charlesa@umext.maine.edu
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