Gypsy Moth

Gypsy Moth FAQ

The Gypsy Moth is an invasive species that has been in Canada for over a century. If you think your tree may be infested by Gypsy Moth or larvae, contact P & A for a diagnosis, assessment, and advice.

Q: What is the Gypsy Moth?
A: It is an insect that was imported in the early part of the 1900s from Europe and first appeared in the United States. It moved into Ontario in the early 1980s.

Q: How does the Gypsy Moth affect the tree?
A: Larvae hatches in early spring and starts to feed on tender leaves, eventually stripping the tree of its leaves.

Q: Which trees are affected by the Gypsy Moth?
A: Primarily Oak trees, but may affect other trees when populations of the insect are high.

Q: What will happen to an infested tree?
A: If the leaves are eaten by the larvae for two consecutive years, the tree may die.

Q: What signs should I look for in my trees?
A: Egg masses (400 to 700 eggs) are easiest to identify as they are tan in colour and suede-like in appearance. They are about 2.5cm in diameter on the trunk or limbs of the Oak. They are easiest to identify in the late fall or winter.

Q: What is the prevention or treatment?
A:  Scraping egg masses in the winter and early spring is effective. Placing sticky bands on the trunk or folding burlap around the trunk. Past practice for some property owners has been ground or aerial spraying of a naturally occurring entity, called Bt.

Q: Where is the Gypsy Moth active?
A: Across Ontario.

If you believe your trees could be infested with the Gypsy Moth or if you have any inquiries, please contact us!


The above is general information and does not try to address or endorse any particular product or activity related to the pests as they affect trees.