BATH - Entomologists at the Maine Department of
Agriculture, Conservation and Forestry's Maine Forest Service (MFS) are continuing
their battle against winter moth. On Wednesday, September 12, they will be setting
out parasitic flies (Cyzenis albicans) in Bath as part of a biocontrol
project to control the invasive winter moth (Operophtera brumata). In several Massachusetts locations, the parasitoids have been successful in reducing winter moth populations to non-damaging levels.
WHAT: Setting out parasitic flies as part of a biocontrol project
to combat winter moth
The flies are currently in cocoons for the winter and will be set
out in a cage buried in the ground until spring. In early May when the flies
start to emerge the cage will be opened to release them to go to work on the
winter moth.
WHEN: 11:00 a.m., Wednesday, September 12, 2018
WHERE: Parking lot behind Grace Episcopal Church, 1100 Washington
St, Bath, Maine (enter from Edward St)
Part of a larger release program
Wednesday’s scheduled release is part of a larger release program,
undertaken in conjunction with the University of Massachusetts, with funding
from the U.S. Department of Agriculture to control the winter moth across New
England. Flies have been released in six other locations in south coastal Maine
starting in 2013 and are starting to become established in Kittery, Cape
Elizabeth and Vinalhaven. In several locations in Massachusetts, where the
flies have been released since 2005, the parasitoids have been successful in
reducing winter moth populations to non-damaging levels.
Winter moth (Operophtera brumata) & parasitic flies (Cyzenis
albicans)
Both the winter moth and their parasites are originally from
Europe. Winter moth defoliation was first recorded in Maine in 2012 and now the
moths have been detected from Kittery to Mount Desert Island. The larvae
(caterpillars) of winter moth feed on the leaves deciduous trees and shrubs
such as oaks, maples, apples and blueberries, in early spring. Heavy
defoliation for several consecutive years leads to branch dieback and tree
mortality. Winter moth defoliation has contributed to tens of thousands of
acres of oak mortality in Massachusetts and now there is oak mortality in Cape
Elizabeth.
The parasitic flies only attack winter moth and the adult flies
are around for just a few weeks in May making it a good biocontrol agent. They
have been successfully used as a control strategy in Nova Scotia, parts of
western Canada and the US, as well in southern New England.
For more information, contact: Colleen Teerling at 207-287-2431
Winter moth (Operophtera brumata)
Adult Cyzenis albicans, the parasite of winter moth
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