The forest insect and disease situation, Lake States, 1956
Lake States Forest Experiment Station, Forest Service, U.S. Department of Agriculture, 1956 - Nature - 26 pages
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acreage acres of jack aerially sprayed Armillaria aspen wood birch black spruce control measures County damage dieback Discoloration in Aspen DISEASE SITUATION diseased trees Dutch elm disease Dwarf mistletoe Entomologist European pine shoot Forest Experiment Station Forest Pest Leaflet forest productivity Forest Tent Caterpillar Gogebic County heavy defoliation Heavy feeding Hypoxylon canker illus impact increase infected trees infestation insect and disease insect enemy insect pests Iron Counties Jack Pine-Sweetfern Rust Jack-Pine Budworm Lake States Forest larch sawfly losses Lower Michigan Lower Peninsula maple natural stands Norway spruce nurseries Nymphal surveys oak type oak wilt Ottawa National Forest outbreak Peninsula of Michigan percent pine sawfly pine shoot moth pine tortoise scale population R. L. Anderson red pine plantations reducing region reported root rot Saratoga spittlebug Scotch pine serious species spruce budworm symptoms tamarack throughout northern Minnesota traps tree mortality U. S. Forest Serv Upper Peninsula white pine White-Pine Weevil widely scattered