Relation of Starch Content to Conifer Mortality and Growth Loss after Defoliation by the Douglas-fir Tussock Moth
Author: Webb, Warren L.
Source: Forest Science, Volume 27, Number 2, 1 June 1981 , pp. 224-232(9)
Publisher: Society of American Foresters
Abstract:When defoliation is severe and extensive, such as that caused periodically by the Douglas-fir tussock moth, then predictions of tree mortality and growth loss are needed to make management decisions. Starch content of Douglas-fir and white fir twigs provided a good basis for predicting mortality of trees studied in two tussock moth outbreaks, one in British Columbia, Canada, and the other in New Mexico. Trees without detectable starch after defoliation did not recover, but trees with some starch invariably recovered if no additional defoliation occurred. Crown regrowth also was found to be correlated with starch content at time of bud burst. Our knowledge of the physiological mechanisms of starch dynamics in conifers coupled with field observations strongly suggests that starch content generally will be a good indicator of conifer vigor after insect defoliation. Forest Sci. 27:224-232.
Document Type: Journal article
Publication date: 1981-06-01
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