. 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. Mountain Pine Beetle cle of beetle infestations will occur. Resources adjacent to wilderness areas may be partially protected from the buildup of populations inside wildernesses through intensive management. A buffer strip of managed trees in- side the wilderness area may also be necessary to protect adjacent lands. Status From 1979 to 1983 From 1979 to 1983, the moun- tain pine beetle kil
. 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. Mountain Pine Beetle cle of beetle infestations will occur. Resources adjacent to wilderness areas may be partially protected from the buildup of populations inside wildernesses through intensive management. A buffer strip of managed trees in- side the wilderness area may also be necessary to protect adjacent lands. Status From 1979 to 1983 From 1979 to 1983, the moun- tain pine beetle killed more than 79 million pines: 95 percent of the trees killed were lodgepole pine; 4 percent were ponderosa pine; and 1 percent were other pines, including western white pine, sugar pine, and high- elevation whitebark pine (fig. 5). The location of outbreaks dur- ing this 5-year period is shown in figure 6. This information was compiled from aerial surveys. In each Western State, the estimates of acres infested (table 1) and trees killed (table 2) are divided into host type: lodgepole, ponderosa pine, and other pines. These estimates include lands of all ownership and were compiled from data provided by USDA Forest Service regions. Because of the extensive acreage of suscepti- ble host type in Oregon and Mon- tana, these two States had the greatest amount of tree mortality. Prevention/Suppression As new information has become available, pest managers have been encouraging land managers to implement sound pest management strategies. Hazard rating models (Amman and others 1977; Cole and McGregor 1983) have provided useful tools to identify stands where risk of loss is highest. Since 1979, about 965 million cubic feet ( million m3) have been removed from 857,731 acres (347,119 ha) to salvage mortality, suppress small infestations, and prevent outbreaks from develop- ing (table 3). Insecticides have also been used to control the mountain pine beetle. Over the 5-year period, Co
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