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Site Factors Related to Fusiform Rust Incidence in North Florida Slash Pine Plantations

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The influence of site factors on the incidence of fusiform rust was examined in six North Florida slash pine plantations which ranged from 1.9 to 89.8 percent of the trees infected. Rust was most abundant on the more fertile, well-drained soils where oak and pine grew best and in association with one another. The factor most associated with rust incidence was the amount of inoculum on the oak host. Percent of pines infected increased linearly with 4√telia/ha. Other factors positively associated with percent rust on pines were oak leaf surface area, annual increment of susceptible pine shoot tissue, amount of extractable soil P, and internal soil drainage. Favorable ambient temperatures and relative humidity during the basidiospore production and pine infection period occurred frequently at all locations. The periods of maximum inoculum production and host susceptibility for both oak and pine coincided at all locations. Analyses of supplemental data on pine rust incidence and oak volume from fifteen counties in North Florida showed a significant positive relation between amount of oak and rust incidence on pine. These findings are significant in that high rust hazard sites in North Florida can be identified on the basis of the availability of inoculum, i.e., number of telia, or the potential availability of inoculum, i.e., the amount of susceptible oak tissue. Further disease control strategies which limit the amount of inoculum on oak and pine can be considered. Forest Sci. 23:69-77.
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Keywords: Cronartium fusiforme; Pinus elliottii; Quercus sp; epidemiology; forest disease

Document Type: Journal Article

Affiliations: Associate Professor of Forest Pathology, School of Forest Resources and Conservation, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, Florida 32611

Publication date: 1977-03-01

More about this publication?
  • 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.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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