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Voltage Gradients in Trees as an Indicator of Susceptibility to Insect Attack

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Voltage gradients in trees may be used to determine their physiological condition and hence their susceptibility to insect attack. Field measurements with a portable vacuum-tube millivoltmeter have shown that in normal trees the voltage gradient is positive in the spring but becomes negative later in the summer. In trees which are subnormal, but with no external evidence of lowered vitality, the cycle is at least partially reversed. The importance of these findings in insect control is obvious.

Document Type: Journal Article

Affiliations: Assistant Entomologist, Division of Forest Insect Investigations, Bureau of Entomology and Plant Quarantine, New Haven, Conn.

Publication date: June 1, 1943

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  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.

    2015 Impact Factor: 1.476
    Ranking: 22 of 66 in forestry

    Also published by SAF:
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