Soil and tissue nutrients, soil drainage, fertilization and tree growth as related to fusiform rust incidence in Slash Pine

Hollis, C.A.; Smith, W.H.; Schmidt, R.A.; Pritchett, W.L.

Forest Science 21(2): 141-148

1975


ISSN/ISBN: 0015-749X
Accession: 000194478

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Abstract
Reports results of 25 uniform fertilizer trials with Pinus elliottii 5 years after establishment on representative forest soils in the southern USA. Incidence of Cronartium fusiforme averaged 35.3% (range 0-86.0%). Rust incidence and tree height increased with the addition of fertilizer, but not significantly. Rust incidence was lowest on poorly drained, intermediate on moderately drained and highest on well drained soils. In unfertilized treatments, rust incidence was directly correlated with extractable P in the soil and in the foliage and inversely related to total soil N. On soils deficient in P or N, fertilizer treatment with P or N respectively increased rust incidence. Incidence of fusiform rust (Cronartium fusiform) on Pinus elliottii var. elliottii and tree height increased with the addition of fertilizer, but these increases were not statistically significant. Rust incidence was lowest on poorly drained soils, intermediate on moderately drained soils, and highest on well drained soils, Incidence in unfertilized treatments was directly correlated with extractable soil P and foliar P, and inversely related to total soil N. In 25 uniform fertilizer tests with slash pine, 5 years after establishment, on representative forest soil types of the Lower Coastal Plain of the southern United States, rust incidence averaged 35.3 percent and ranged from 0 to 86.0 percent. Rust incidence and tree height increased with the addition of fertilizer, but these increases were not statistically significant. Significant differences in rust incidence and tree height occurred among soil drainage classes. Rust incidence was lowest on poorly drained soils, intermediate on moderately drained soils, and highest on well-drained soils. Rust incidence in unfertilized treatments was directly correlated with extractable soil P and foliar P and inversely related to total soil N. With separation into soil drainage classes 9 tests showed an increase in rust with added N (N-rust-responsive tests) and 8 tests showed an increase in rust with added P (P-rust-responsive tests). Comparison of soil and foliar N and P indicated that prior to fertilization N-rust-responsive tests were relatively low in soil and foliar N, and P-rust-responsive tests were relatively low in soil and foliar P.