Got Moths? Your Trees Might be in Danger
Moths of different types
find food and shelter in various places in the home. Some nest in carpets while
others infest clothes closets and creating significant damage.
However, outside your
home, another type of moth, winter moths seek out hardwood trees to infest.
Between November and January, they find homes in trees and their larvae feed on
the developing leaves in the spring, causing noticeable defoliation of the
trees as summer approaches. Over several years, the tree will eventually die.
Where is Winter Moth Prevalent?
According to the National Institute of Health,
winter moths originated in Europe and spread to North America. Their
infestation is most prominent in the Northeast section of the United States
although other areas have experienced the problem. The outbreak causes severe
damage to tree varieties that include oak, maple, ash, elm, beech,
fruit-bearing trees and more.
Symptoms of Winter Moth Damage
Presence of the moth
larvae is usually not detectable until the leaf bud opens to reveal small
feeding holes. Eventually, new caterpillars descend to the ground on silken
threads to start the process again in late fall.
Treatment for Winter Moths
Chemical
injections in late fall or
early spring before the buds begin to break is the best time to prevent winter
moth infestation. The impact of these injections is most significant if the
soil has adequate moisture during application. After treatment, the larvae
should die. The trees should be closely monitored to determine if an additional
application is needed.
An interesting approach
to eliminating winter moth infestation was cited in a Newport This Week article in
January 2017. The strategy to resist a severe outbreak was to introduce a type
of fly that loves eating winter moths. The long-term plan is for the fly
population to become established and act as a control agent. However, this
natural process, effective in Nova Scotia, may take up to 10 years to control
the winter moth population here.
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