Ratio Estimation Fusiform Rust Incidence in Southern Pine Plantations
Incidence of infection with Cronartium fusiforme was determined by examining each tree in eighteen 3- to 15-year-old plantations of slash or loblolly pine of 9 to 11 acres each. With these data, empirical sampling trials were carried out, with the individual rows of trees as the basic sampling unit, to determine the biases involved in various estimates of the proportion of infected trees and of the variances of these estimates. For most purposes the bias in estimating proportions of infection would be negligible even with sample sizes as small as three rows per plantation; whereas, for samples of this size, bias in the estimated variance might be as much as 13 percent. Forest Sci. 17:135-142.
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Document Type: Journal Article
Affiliations: Forest Pathologist, Southeastern Area, State and Private Forestry, USDA Forest Serv., Atlanta, Ga.
Publication date: 1971-03-01
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Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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