Gypsy Moth

Oaks, maples and elms are some of North America’s most beautiful deciduous trees, but these trees are susceptible to a devastating forest pest called the gypsy moth.

When are my trees at risk and what should I look for?

When gypsy moth populations reach high levels, large quantities of foliage will be consumed and defoliation of the tree canopy can occur.

The effects of gypsy moths can be extremely devastating to a trees health. These moths will feed on hundreds of species of plants, but prefer to feed on oaks and aspen.

Egg are laid in a tan colored egg mass containing 75 to 1,000 individual eggs. The masses are covered with hairs from the female’s body that protects the eggs from dying in winter temperatures. The eggs can essentially be laid on any part of the tree.

Egg laying begins mid- July and ends mid- August. These eggs overwinter and hatch during May of the following year.

Larvae will begin to feed on newly expanded leaves during the spring.

As devastating as gypsy moths can be to a trees’ health, there are many treatment and prevention methods that can be quite effective. Your local arborist will develop a unique plan of treatment and prevention for your landscape. Find your local arborist here or View the full PDF.

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