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Budbreak and Leaf Growth Functions for Modeling Herbivory in Some Gypsy Moth Hosts

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Functions are reported which predict percent budbreak and average leaf dry weight from elapsed degree-days (threshold = 4.4°C) for 6 important hosts of the gypsy moth (Lymantria dispar): Quercus alba, Q. rubra, Q. velutina, Fagus grandifolia, Acer rubrum, and A. saccharum. Budbreak observations are also summarized for Betula lenta and B. alleghaniensis. Day 105 (Julian date) was the best single date to start counting degree-days to predict percent budbreak for all species, years, and locations covered by this study. Simultaneous solution of the red oak leaf growth function and published gypsy moth larval growth and consumption functions predicted that an average larva will consume about 1,115 mg dry leaf weight, and drop about 156 mg. Apparent herbivory attributable to a single larva was calculated as 1,381 mg dry weight, where an average mature red oak leaf weighed 448 mg. Forest Sci. 29:607-617.

Keywords: Lymantria dispar; budburst; defoliation; phenology

Document Type: Journal Article

Affiliations: Research Forester, USDA Forest Service, Northeastern Forest Experiment Station, Center for Biological Control of Northeastern Forest Insects and Diseases, 51 Mill Pond Road, Hamden, CT 06514

Publication date: 1983-09-01

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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