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Fusiform Rust

Fusiform rust, caused by the fungus Cronartium quercuum f. sp. fusiforme, requires two hosts, southern hard pines and oaks, to complete its life cycle. Thirty -two species of pines are susceptible to the disease. Slash, loblolly, and South Florida slash pines are highly susceptible; longleaf and pond pines are less susceptible; and pitch and shortleaf pines are relatively resistant. Members of the black oak group are the most common alternate hosts of the fungus, but 33 species of oaks are susceptible to the disease. Four species of chestnut and two species of chinkapin and tanoak also are susceptible.

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Author(s): Samuel J. Rowan

Publication: Forest Nursery Pests (1989) - Conifer Diseases