. Eastern forest insects . COURTESY CONN. AGR. EXPT. STA. Figure 113.—Larva of the pale moth, Halisidota tessellaris. The sycamore tussock moth, Halisidota harrisii (Walsh), feeds on sycamore and London plane trees, and it probably occurs wherever sycamore grows in this country. Adults are indis- tinguishable from those of the pale tussock moth, and the larvae of the two species differ only in color. Those of this species have yellowish bodies clothed in whitish to yellow hairs and their long hair pencils are orange-colored. Infestations are often heavy on shade and ornamental sycamore in the
. Eastern forest insects . COURTESY CONN. AGR. EXPT. STA. Figure 113.—Larva of the pale moth, Halisidota tessellaris. The sycamore tussock moth, Halisidota harrisii (Walsh), feeds on sycamore and London plane trees, and it probably occurs wherever sycamore grows in this country. Adults are indis- tinguishable from those of the pale tussock moth, and the larvae of the two species differ only in color. Those of this species have yellowish bodies clothed in whitish to yellow hairs and their long hair pencils are orange-colored. Infestations are often heavy on shade and ornamental sycamore in the Northeast. The fall webworm, Hyphantria cunea (Drury), occurs through- out the United States and southern Canada. Its hosts include more than 100 species of forest and shade trees. The adult has a wingspread of 30 to 42 mm., and the bases of the front legs are orange or bright red. In the southern part of its range, the moth is white, usually with dark spots on the wings. In the North, particularly in eastern Canada, it is nearly always pure white and is often referred to as H. textor Harris. Full-grown larvae are usually pale yellowish or greenish, with a broad dusky stripe down the back and a yellowish stripe down each side. They are about 25 mm. long. The larvae of the textor form are dark. Their bodies are covered with long silky, gray hairs arising in tufts from orange-yellow or black tubercles. Adults appear mostly from May to July and deposit their eggs in hair-covered masses of several hundred eggs each, usually on the undersides of leaves. Newly-hatched larvae immediately begin to spin a silken web over the foliage on which they feed; and, as they grow, they enlarge the web to enclose more and more foliage (fig. 114). On heavily infested trees several branches may be enclosed in webs. Small trees are often enclosed entirely. The 306
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
