Caterpillars have been inhabiting our planet for 300 million years and in recent years they are delivering a carnage in the GTA.
HOSTS: These insects love to feed and nest on Sugar maple, birch, oak, aspen etc.
EVIDENCE: Shiny brown egg masses are present from July until early spring of the following year. They differ from those of eastern tent caterpillar in having square edges, and they completely encircle the twigs of host trees. Larvae, which are present in early spring, have distinctive keyhole-shaped white spots on the middle of the back of each segment.
Defoliation of all except larger veins and petioles of the leaf occurs in May and June. The adult moths appear in July.