by Dept. of Agriculture : for sale by the Supt. of Docs., U.S. Govt. Print. Off. in [Washington] .
Written in English
|Statement||by David R. Houston and Harry T. Valentine.|
|Series||Gypsy moth handbook, Agriculture handbook -- no. 542, Agriculture handbook (United States. Dept. of Agriculture) -- no. 542.|
|Contributions||Valentine, Harry T., United States. Dept. of Agriculture|
|The Physical Object|
|Pagination||19 p. :|
|Number of Pages||19|
The recent spread of the gypsy moth [Lymantria dispar (L.)] into new and different forest situations in New England prompted a search for ways to evaluate the susceptibilities of forests to defoliation by the moth. In this handbook, susceptible and resistant New England stands are described, and a general approach for comparing them to forests outside the outbreak area is by: Gypsy moth larvae feed on the foliage of a wide variety of woody plants. During heavy infestations, most tree and shrub species will be fed upon to some extent. However, gypsy moth larvae have distinct food preferences. From the results of controlled studies and field observations, the susceptibility of tree and shrub species to gypsy moth feeding. The relative dominance of highly preferred tree species appears to be the major determinant of forest susceptibility (defoliation potential). This means that stands with a large component of highly preferred species, such as oaks, are likely to be defoliated. Our Research. Gypsy Moth Spread in North America; Gypsy Moth Outbreak Dynamics; Slow. Gypsy moth populations usually remain low, but occasional increases to very high levels can result in partial or total defoliation of host trees.  According to a report, the gypsy moth is now one of the most destructive insects in the eastern United States; it and other foliage-eating pests cause an estimated $ million in annual.
The most important factor affecting the susceptibility to gypsy moth defoliation is the proportion of the stand comprised of gypsy moth’s preferred host species (1, 27, 37, 51). While many species of trees and shrubs are utilized as a food source, gypsy moth caterpillars prefer some species and avoid others. Stands dominated by oaks, aspen. A 2-year study was conducted on the distribution of parasitoids of gypsy moth,Lymantria dispar (L.) (Lep.: Lymantriidae), in mesic and adjacent higher elevation transition and xeric forest habitats in Vermont (U.S.A.). In both years, overall parasitism ranged from 12–18% in each habitat. When analyzed according to the life stage at which the host was collected, parasitism rates of greater. The Effects of Chemical Control Agents Used Against the Gypsy Moth by Stephanie Wronski. The gypsy moth (Lymantria dispar) is a highly disruptive species that can, and has played a distinctive role in the lives of many ed in these organisms are various deciduous trees and shrubs, wildlife species that share the same environment, and even humans. Contact Information. Northern Research Station One Gifford Pinchot Drive Madison, WI () () TTY/TDD. Contact Us.
United States Department of Agriculture Rating Forest Stands for Forest Service Gypsy Moth Defoliation Northeastern Forest Experiment Station Research Paper NE Owen W. Herrick David A. Gansner. European Gypsy Moth. European gypsy moth is a significant nonnative forest pest in the United States. The goals of APHIS-PPQ are to define the extent of the gypsy moth infestation, to eradicate isolate populations, and to limit the artificial spread of gypsy moth beyond the infested area through quarantines and an active regulatory program. To plan for the management of the gypsy moth, the distribu-tion of susceptible stands must be limited in currently unin-fested areas. Liebhold and others (a, b) analyzed forest inventory data from across the conterminous United States to evaluate the susceptibility of all forests to gypsy moth defoliation. Gypsy moth caterpillars feed on the leaves of many woody plants, although some species are more susceptible than others. The major factor associated with susceptible forest stands - those most likely to experience defoliation from a large density of gypsy moth caterpillars - is the presence of tree species favored by the gypsy moth. Table 1 lists.