Photographic guide to crown condition of oaks: use for gypsy moth silviculture [report]

Kurt W. Gottschalk, Russ W. MacFarlane
1993 unpublished
Crown condition of oaks (Quercus spp.) as a measure of tree vigor, has been shown to be the single most important factor in predicting mortality due to gypsy moth (Lymantria dispar L.) defoliation-induced stress. Although tree vigor is a continuous variable, common practice has been to assign trees to one of three crown condition classes to reduce subjective error. The assessment of crown condition is based on ocular estimates of percent of dieback in the crown, foliage density, size, and
more » ... ty, size, and color, and presence of epicormic branches. Crown condition classes for oaks are defined. Color photographs are provided as guides to assessing crown condition, and the various factors involved in assigning crown conditions are discussed. Applications in vulnerability rating and silvicultural treatments to minimize gypsy moth impacts are presented.
doi:10.2737/ne-gtr-168 fatcat:dk2o5emmuzan3e3g6zqwurshz4