An evaluation of electrical resistance as a measure of vigor in eastern white pine

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Abstract
Differences in tree vigor were observed in a planting of eastern white pine, Pinusstrobus L. Trees were visually classified into four vigor classes. Electrical resistance (ER) readings of the cambial zone and growth measurements of needles, internodes, and annual rings were compared for each class. Mean ER readings were related inversely to vigor; however, only mean readings for class 1, most vigorous, and class IV, least vigorous, trees were significantly different on four reading dates. Mean growth measurements of needles, internodes, and annual rings were significantly different for all four vigor classes.

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