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Notes: Some Effects of Defoliation by Gypsy Moth (Porthetria dispar L.) and Elm Spanworm (Ennomos subsignarius Hbn.) on Water Balance and Growth of Deciduous Forest Trees

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Soil moisture, and the xylem pressure potential, bole contraction, stomatal behavior, and growth of defoliated and undefoliated trees in forest stands were compared in July 1971 after a severe infestation of lepidopterous defoliators. The soil moisture content and xylem pressure potential were higher and the bole contraction was less in defoliated stands. The pressure potential of twigs was high--i.e. hydration was high--when they were more than 75-percent defoliated. In three or four species, stomatal resistance to evaporation was lower in the fully expanded secondary leaves appearing after defoliation than in the primary leaves that had escaped defoliation. Radial growth of the bole was severely reduced by defoliation. Forest Sci. 18:326-330.

Keywords: Lepidoptera; Quercus; insect damage; mixed hardwoods; plant water stress

Document Type: News

Affiliations: Members of the Dep. of Ecology and Climatology, The Connecticut Agricultural Experiment Station, P.O. Box 1106, New Haven 06504

Publication date: December 1, 1972

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.

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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