. Insect and disease conditions in the United States, 1979-83 : what else is growing in our forests?. Forest insects United States; Trees Diseases and pests United States; Plants Disease and pest resistance. Root Diseases Figure 6. Areas where root diseases are a management Areas of management concern benefit snag-dependent species. Because their roots are decayed, however, snags may soon topple. In old-growth forests, root diseases can break up stand struc- ture and possibly adversely affect wildlife dependent on old growth. Fire. Dead trees and large ac- cumulations of woody
. Insect and disease conditions in the United States, 1979-83 : what else is growing in our forests?. Forest insects United States; Trees Diseases and pests United States; Plants Disease and pest resistance. Root Diseases Figure 6. Areas where root diseases are a management Areas of management concern benefit snag-dependent species. Because their roots are decayed, however, snags may soon topple. In old-growth forests, root diseases can break up stand struc- ture and possibly adversely affect wildlife dependent on old growth. Fire. Dead trees and large ac- cumulations of woody debris can increase the potential danger of fire. In root disease centers, wind- thrown trees may also have a "fire-ladder" effect, carrying fire from the ground level into the crowns of living trees. Visual Quality. Generally, root diseases produce small openings in forests. In some situations, however, these openings may coalesce to cover 100 acres (40 ha) or more (fig. 5). When they are visible from well-traveled roads, these large openings can affect people's enjoyment of the view. Status From 1979 to 1983 Over large areas, root disease incidence remains relatively con- stant in the short term; therefore, the acreages in table 3 represent an estimate for any year from 1979 to 1983. These figures include areas on lands of all ownerships—private, State, and Federal—where root diseases warrant special management consideration. The figures were derived from a variety of surveys done by pest management specialists during the past decade. The surveys ranged from large, multiple-forest. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Loomis, Robert C; Tucker, Susan; Hofacker, Thomas H; United States. State and Private Forestry; United States. Forest Pest Management. [Washington, D. C. ] : The Serv
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