. Eastern forest insects. Forest insects. F-494206, 494207 Figure 143.—Adult and lar- vae of the Nantucket pine tip moth, Rhyacionia frus- trana. webs between buds, or between buds and needles; they feed in the buds. When a bud is consumed, the larva moves to another bud on the same or a different shoot. Eventually, the connective tissue of the tip is severed, and the damaged portion turns brown. The larva continues to feed within the shoot and bud. Once hav- ing consumed the bud, it bores down the center of the stem. The larval period lasts for 2 to 4 weeks. Toward the end of this period, the
. Eastern forest insects. Forest insects. F-494206, 494207 Figure 143.—Adult and lar- vae of the Nantucket pine tip moth, Rhyacionia frus- trana. webs between buds, or between buds and needles; they feed in the buds. When a bud is consumed, the larva moves to another bud on the same or a different shoot. Eventually, the connective tissue of the tip is severed, and the damaged portion turns brown. The larva continues to feed within the shoot and bud. Once hav- ing consumed the bud, it bores down the center of the stem. The larval period lasts for 2 to 4 weeks. Toward the end of this period, the larva constructs a webbed cell within the shoot in which it pupates. In the Deep South, there are five or six generations per year. In the North Carolina, Virginia area, there are three per year. Still farther north, in Pennsylvania and Ohio, there are only two per year. The Nantucket pine tip moth is a major pest of young plants in the eastern United States. During recent years, it has become increasingly abundant and destructive as a result of the estab- lishment of large areas of pine plantations and seed orchards. Damage consists of the retardation of height growth, the crook- ing or forking of main stems, the reduction of cone crops, and, occasionally, the death of the tree. Attacks are generally re- stricted to trees less than 15 feet in height and are most severe in young plantations, but severe attacks on commercial-size trees have also been reported. 364. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Baker, Whiteford L. (Whiteford Lee), 1903-. Washington : U. S. Dept. of Agriculture, Forest Service ; for sale by the Supt. of Docs. , U. S. G. P. O
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
