. Hazard-rating systems in forest insect pest management : symposium proceedings, Athens, Georgia, July 31-August 1, 1980. Forest insects Biological control United States Congresses; Forest insects United States Analysis; Forest insects United States Management. METHODS Field Procedure The Study Area The Piedmont of Georgia can be divid- ed into two distinct physiographic provin- ces (fig. 1). The Lower Piedmont has broad interstream areas of gently rolling hills. The Upper Piedmont is characterized by hilly topography and pronounced ridges. Study plots were located in both provin- ces. Loblol
. Hazard-rating systems in forest insect pest management : symposium proceedings, Athens, Georgia, July 31-August 1, 1980. Forest insects Biological control United States Congresses; Forest insects United States Analysis; Forest insects United States Management. METHODS Field Procedure The Study Area The Piedmont of Georgia can be divid- ed into two distinct physiographic provin- ces (fig. 1). The Lower Piedmont has broad interstream areas of gently rolling hills. The Upper Piedmont is characterized by hilly topography and pronounced ridges. Study plots were located in both provin- ces. Loblolly pine and shortleaf pine are the predominant host species in the area. Approximately 80 percent of the forest resource in the Piedmont is loca- ted on nonindustrial private lands man- aged for timber and nontimber Figure counties for the Piedmont of Georgia. Data from 58 stands attacked by the SPB and 139 baseline stands were used to develop the rating systems. Study plots were located in Madison, Elbert, and Ogle- thorpe Counties, Georgia. These counties are in the Upper Piedmont and contain ap- proximately 1,150 km2 of host type. An additional data base—64 attacked stands in 11 other Upper Piedmont counties and 38 attacked stands in 3 lower Piedmont counties—was used to test the application of local rating systems over a large area. Plots were sampled in the Upper Piedmont from 1975 through 1977. SPB populations in Georgia during 1975 were in decline from epidemic conditions; beetle popula- tions were endemic during 1976 and 1977. Plots were sampled during 1979 in the Lower Piedmont. Beetle populations in this area had risen to epidemic levels with more than 16 infestations per hectare of host type. The Georgia Forestry Commission, the Chattahoochee-Oconee National Forests, and ground-survey crews provided location of attacked stands. Ground crews located plot center in attacked stands m north of what could best be determined as the first infested
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