. 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. Southern Pine Beetle Figure 4. Area infested by southern pine beetle by year from 1979 to 1983. Year 1983 I J 1982 1981 1980 Millions of Acres â 1 i 1 1 â r 0 5 1 1 â 1 1 r 10 15 aded woodpecker for old, heartrot-infected trees. This com- petition not only reduces bird habitat but also complicates con- trol efforts. Status From 1979 to 1983 The epidemic that began in 1978 persisted until 1
. 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. Southern Pine Beetle Figure 4. Area infested by southern pine beetle by year from 1979 to 1983. Year 1983 I J 1982 1981 1980 Millions of Acres â 1 i 1 1 â r 0 5 1 1 â 1 1 r 10 15 aded woodpecker for old, heartrot-infected trees. This com- petition not only reduces bird habitat but also complicates con- trol efforts. Status From 1979 to 1983 The epidemic that began in 1978 persisted until 1981, when it collapsed (fig. 4). At its peak, this epidemic covered 15 million acres ( million ha) of host type. Most of the outbreak areas were in four States: Alabama, Georgia, South Carolina, and Mississippi. Texas and Louisiana, two States that had suffered heavy losses in earlier outbreaks, were not part of the severely infested area. The bulk of the losses from 1979 to 1983 occurred in the Piedmont (fig. 5)âa fact perhaps explained by unusually dry condi- tions in this area. Drought may have reduced the trees' resistance to the mass attacks of the southern pine beetle. By contrast, the Western Gulf States, which had relatively abundant rainfall, were not severely infested (Ander- son and Hoffard 1982). Table 1 lists the acreage in- fested each year by State. These acreage figures represent the total Figure 5. Areas of southern pine beetle outbreaks from 1979 to 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 Service
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