. Eastern forest insects. Forest insects. COURTESY CONN. AGR. EXPT. STA. Figure 122.—Larvae of the white-marked tussock moth, Hemerocampa yellowish hairs on each of the first four abdominal segments and reddish dots on the sixth and seventh segments. The sides of the body are clothed in white and blackish hairs radiating from rows of small yellow tubercles. Winter is spent in the egg stage and hatching occurs between April and June. Young larvae feed on the surface of the leaves, skeletonizing them. Later, they chew holes in other leaves and finally consume all but the larger vei
. Eastern forest insects. Forest insects. COURTESY CONN. AGR. EXPT. STA. Figure 122.—Larvae of the white-marked tussock moth, Hemerocampa yellowish hairs on each of the first four abdominal segments and reddish dots on the sixth and seventh segments. The sides of the body are clothed in white and blackish hairs radiating from rows of small yellow tubercles. Winter is spent in the egg stage and hatching occurs between April and June. Young larvae feed on the surface of the leaves, skeletonizing them. Later, they chew holes in other leaves and finally consume all but the larger veins. Young larvae often spin down on silken threads and are sometimes transported consider- able distances by the wind. The larvae become full-grown in 5 or 6 weeks, then, under branches or in bark crevices, they spin grayish cocoons consisting of silk and hairs from the body. The pupal stage lasts about 2 weeks, and the number of generations per year varies from one in the northern parts of the insect's range to three in the South. The white-marked tussock moth is a pest of shade trees, par- ticularly American elm, in cities and towns. It also occurs in forested areas but usually causes minor damage there. Howard {382, 383) discussed the life history, habits, and parasites of the species. Hemerocamva definita (Pack.), the definite-marked tussock moth, occurs in southern Ontario and several of the Eastern States and feeds on quite a wide variety of deciduous trees such as willow, apple, wild cherry, elm, paper birch, red oak, red maple, and ash. The adults and larvae closely resemble those of the white-marked tussock moth in form and size, and in the arrangement of the tufts of hairs on the larvae. Wingless females are clothed in golden-brown hairs. They lay their eggs in masses on the cocoons from which they emerge, covering them with hairs from their bodies. In the Northeastern States these egg masses are often mistaken for those of the gypsy moth. In addition to the con- sp
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
