. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. SHADE TREE INSECTS 13 Cankerworms The Fall Cankerworm, Alsophila ponietaria Harr. The Spring Cankerworm, Paleacrita vernata Peck. The cankerworms, also known as measuring or inch w^orms, or sometimes as loopers, attack the leaves of numerous broad-leaved trees in the northeastern United States. They are known to be especially injurious to elms and apples. At various times, elms in different parts of Massachusetts have been severely defoliated by these insects. Both kinds of cankerworms may be found on the
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture -- Massachusetts. SHADE TREE INSECTS 13 Cankerworms The Fall Cankerworm, Alsophila ponietaria Harr. The Spring Cankerworm, Paleacrita vernata Peck. The cankerworms, also known as measuring or inch w^orms, or sometimes as loopers, attack the leaves of numerous broad-leaved trees in the northeastern United States. They are known to be especially injurious to elms and apples. At various times, elms in different parts of Massachusetts have been severely defoliated by these insects. Both kinds of cankerworms may be found on the same trees. One lays its eggs very late in the fall and is, therefore, called the fall cankerworm; the other lays its eggs very early in the spring and is known as the spring cankerworm. Both hatch at about the same time in the spring, and the >oung caterpillars may be found feeding together soon after the leaves have appeared. %4J. k^^y<^ Elm Leaves Injured by Cankerworms. Description. The two species may be told apart in their various stages by the following characteristics: In both species the female moths are wingless. The female of the fall species is uniformly gray, while the spring species has a dark, longitudinal stripe on its back. In both species the male moths are winged and are a brownish gray, the fall species being darker. The adults of both sexes of the spring species have â on the top of the first seven abdominal segments a transverse row of sharp reddish spines projecting toward the rear. In the fall species this is absent. The individual eggs of the fall species are shaped like a flower pot, are flat on top, and fairly smooth on the side; whereas those of the spring species are oval in shape and ridged on the side. The caterpillars vary in color and have several thin longitudinal stripes on. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
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