. Biology of rust resistance in forest trees : proceedings of a NATO-IUFRO advanced study institute, August 17-24, 1969. Trees; Pine; Trees; Rust diseases. 482 E. P. VAN ARSDEL PREDICTION OF MICROCLIMATES FAVORABLE AND UNFAVORABLE TO RUST The white pine blister rust fungus (Cronartium vibioola Fisch, ex Rabenh.) is sharply limited by meteorological factors in the eastern United States (Charlton, 1963; Van Arsdel, Riker, and Patton, 1956). In the Lake States, climate largely determines the distribution of rust. For convenience the disease distributions can be divided into three scales acco
. Biology of rust resistance in forest trees : proceedings of a NATO-IUFRO advanced study institute, August 17-24, 1969. Trees; Pine; Trees; Rust diseases. 482 E. P. VAN ARSDEL PREDICTION OF MICROCLIMATES FAVORABLE AND UNFAVORABLE TO RUST The white pine blister rust fungus (Cronartium vibioola Fisch, ex Rabenh.) is sharply limited by meteorological factors in the eastern United States (Charlton, 1963; Van Arsdel, Riker, and Patton, 1956). In the Lake States, climate largely determines the distribution of rust. For convenience the disease distributions can be divided into three scales according to meteorological conditions: (1) a macro scale that is determined mainly by latitude and mass area elevation, (2) a meso scale that is determined by elevation range of hills and river valleys, and (3) a micro scale that is determined by the structure of forest stands and the influence of small hills and slopes within the stand (Van Arsdel, 1965a). In the large-scale climatic gradation, rust is more general and found on white pines (P. strobus) on all sites in the more northern regions, at higher elevations, and near cold bodies of water such as Lake Superior (Van Arsdel, 1961, 1964). This is shown as zone 4 in Fig. Figure 2. Map showing differences in quantity of blister rust spread to white pines in the Lake States. Rust in tops of emergent pines carried from distant ribes are characteristic of Zone 4. The cooler the summer weather, the more favorable for disease 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 North Atlantic Treaty Organization; International Union of Forestry Research Organizations; United States. Forest Service; University of Idaho. Washington, D. C. : Forest Service
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Keywords: ., bookauthoruni, bookcentury1900, booksubjectpine, booksubjecttrees
