Distribution of bark beetle attacks on ponderosa pine trees in Montana
U.S. Dept. of Agriculture, Forest Service, Intermountain Forest & Range Experiment Station, 1967 - Bark beetles - 7 pages
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71 beetle-killed Age class annually Areas occupied Areas of cambium attack by Dendroctonus Bark beetle Basal diameter class beetle attack beetle-killed trees bole attack patterns bole diagrams bole infestation pattern bole infestation types brevicomis in western broods Cali Calif California types characteristics of beetle-killed classified composite diagrams Dendroctonus brevicomis Dendroctonus ponderosae distribution egg galleries emarginatus endemic populations felled Forest fornia four bole infestation galleries and larval Gross board-foot volume Hopkins host trees identified inches initial attacks insect species interior ponderosa pine Ips pini killed living mature ponderosa pine Melanophila californica mixed species Montana and northeastern N E S W northeastern California observed in Montana overmature phloem-feeding insect associates pine beetle plots ponderosa pine stands ponderosa pine trees populations of Dendroctonus Risk of beetle Risk rating sampled study period Table three diameter classes trees in western trees studied trees were analyzed type of bole unattacked utilize Vigor class western Montana