The forest insect situation, Lake States 1955
Lake States Forest Experiment Station, U.S. Dept. of Agriculture, Forest Service, 1956 - Nature - 15 pages
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acreage approximately areas in Minnesota aspen Balsam fir bark beetle Birch Leaf Skeletonizer Chippewa Counties Choristoneura fumiferana completely defoliated control measures Control spraying Counties Defoliator Cambium feeder Dutch Elm Disease Elm Bark Beetle European pine shoot feeder Defoliator Cambium Forest Experiment Station Forest Expt Forest tent caterpillar Gypsy Moth heavy defoliation Heavy feeding heavy in northern heavy infestations illus jack pine Keweenaw Peninsula Lake States Forest Larch sawfly Michigan Wisconsin Minnesota million acres Minnesota Varies Moderate to heavy natural stands northeastern Minnesota northern Minnesota northern Wisconsin northwestern Norway spruce oak leaf caterpillar outbreak Paper Birch parasitic Peninsula of Michigan percent pest of red Pine Leaf Aphid pine sawfly Neodiprion pine shoot moth Pine tortoise scale population red and jack red pine plantations Scotch pine spittlebug infestations spruce budworm spruce-fir type throughout the Lake Upper Peninsula Variable Oak Leaf walkingstick white pine Wisconsin and Michigan Wisconsin Minnesota Michigan Wisconsin Wisconsin