#339 Bruce Spanworm Moth (Operophtera bruceata)

07 February 2021

A moth of the family Geometridae. The larvae hatch in the early spring after overwintering as eggs. The neonates primarily feed on the buds and nearly unfurled leaves of sugar maple, American beech and trembling aspen. They have also been recorded on willow and various other deciduous trees. After feeding for a few weeks, the late instar caterpillars drop down to the soil and build an earthen cocoon. The pupate until the late fall or early winter when they emerge as adults.

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