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Predicting Site Hazard to Fusiform Rust

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Nine plantations of slash pine (Pinus elliottii Engelm. vat. elliottii) were established in 1974 in southern Mississippi to study conditions affecting incidence of fusiform rust. Variables studied included climate, seed source, soil properties, pine growth, fungus and host phenology, abundance of aeciospore-producing galls and telia, number of basidiospores trapped, and the spatial relationships of oaks to the plantations. From 1974 through 1978, the amount of pine infection varied considerably by year according to frequency of rain or nights with prolonged high relative humidity. There also were large, but inconsistent, differences in annual infection among sites, due to a complexity of factors. Seed source, soil properties, and pine growth were unrelated to site hazard. The hazard of each area depended on the relationships of oaks to the pine plantations--how near they were, what directions from the plantation, and the number of oaks. Criteria are presented for differentiating among low-, medium-, and high-hazard sites for fusiform rust. Forest Sci. 32:21-35.

Keywords: Cronartium quercuum f. sp. fusiforme; Pinus elliottii; Quercus spp; disease incidence; epidemiology; forest diseases

Document Type: Journal Article

Affiliations: Principal Plant Pathologists, Southern Forest Experiment Station, USDA Forest Service, Gulfport, MS 39501

Publication date: March 1, 1986

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