Half-winged Geometer

half-winged geometer


Adult females have small wing pads but cannot fly. Caterpillars are tan with many wavy, black lines. Each segment has several small, hairy tubercles.


This species is commonly found on oaks, maples, hickories, ash and cherry.


Adults lay eggs in very early spring, eggs hatch at time of bud break and caterpillars feed on expanding foliage. Caterpillars feed for about six weeks then mature larvae drop to the soil and pupate.


Outbreaks are usually limited by natural controls (predators and parasites). High value trees can be treated with insecticides if necessary.​