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The Analysis of Numerical Change in Gypsy Moth Populations

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A study of gypsy moth, Porthetria dispar (L.), population dynamics was carried out over a 7-year period in several areas in northeastern New York. The data were summarized in life tables, stratified by density and sex, and then analyzed by mathematical models. Variation in the survival rates of the instar IV to VI female larvae and the female pupae was the greatest source of variation in density among dense populations. Variation in the survival rates of both instar I to III and IV to VI female larvae was most important among sparse populations. Disease was the primary determinant of variation in the survival rate of dense populations of instar IV to VI larvae, while agents other than disease or parasites were most important at this stage among sparse populations. The survival rate of dense populations of the female pupae varied primarily in response to parasites and disease. Variation in the survival rate of the instar I to III larvae was probably primarily a function of variation in the dispersion rate of the newly hatched larvae. A generation model was developed that describes density at the start of a second generation as a function of the environmental variables associated with the above mortality-causing factors. It was tested against an independent body of data with some success.

Document Type: Journal Article

Affiliations: Entomologist at the Forest Insect and Disease Laboratory of the Northeastern Forest Experiment Station, Forest Service, U. S. Department of Agriculture, Hamden, Connecticut

Publication date: 1967-09-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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