Temporal and spatial patterns of fusiform rust epidemics in young plantations of susceptible and resistant slash pine pinus elliottii var elliottii and loblolly pine pinus taeda

Schmidt, R.A.; Holley, R.C.; Klapproth, M.C.; Miller, T.

Plant Disease 70(7): 661-666


ISSN/ISBN: 0191-2917
Accession: 006585969

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Fusiform rust [Cronartium quercuum f. sp. fusiforme] incidence data were analyzed from 1,882 predominantly 5-yr-old slash and loblolly pine plantations established on 67,740 ha in eight management areas in Florida and Georgia [USA] between 1961 and 1980. In both species, rust incidence increased from east to west within the region. In the northern portion of its range (central Georgia), rust incidence was greater on slash than on loblolly pine, but in the southern portion of its range (northeastern Florida), rust incidence was greater on loblolly than on slash pine. Temporal trends indicate that specific areas are perennially either high or low in rust incidence, although there are periods of increasing and decreasing epidemics. Rust management strategies can be designed for specific areas according to anticipated high or low rust incidence. Rust incidence was significantly lower (P = 0.01) among plantations established with seedlings from rust-resistant seed sources than among those established from largely unimproved, susceptible sources.