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Insects (Maine Cranberries) - Cranberry Blossomworm

Order: Lepidoptera || Family: Noctuidae
Scientific Name: Epiglaea apiata (Grote)


photo of a Cranberry Blossomworm larva feeding on cranberry foliage in a cranberry bed 2nd photo of a Cranberry Blossomworm larva feeding on cranberry foliage in a cranberry bed 3rd photo of a cranberry blossomworm larva feeding on a cranberry upright in a cranberry bed Photo of a cranberry blossomworm caterpillar


Notes: This member of the cutworm group appears quite consistently each year on Maine cranberry beds, but rarely do its numbers—independent of other caterpillar pests—reach threshold levels [one exception to that was the 2015 season when numbers in the 30 to 100+ per 25 sweeps were being picked up]. When added to False Armyworm counts, however, the threshold for Maine growers is frequently surpassed. Each blossomworm that matures destroys many cranberry blossoms (while still in the bud stage), and once they are half grown, they switch from feeding during the daytime to feeding mostly at night. They overwinter as eggs, deposited singly in October on fallen leaves or pieces of dead vine on the floor of the bed. In Maine, they begin to hatch by the end of May; a few weeks later than that following a Late Water (LW) flood (MS Word) (pdf). [See also pages 16-17 of Cranberry Insects of the Northeast by A.L. Averill & M.M. Sylvia (1998) – There is a nice photo of the moth on page 16 of that book. The moths are around during harvest.]

Sweepnet First Dates (for detecting the young caterpillars in Maine): 6/2/2000, 6/8/01, 5/29/02, 5/24/06, 6/6/07,  5/14/09 and 5/27/2015 (Average of these = May 29th)


Control: For specific and current control recommendations for Maine, please refer to the Maine Cranberry Pest Management Guide.


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: charles.armstrong@maine.edu]

 


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