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Triadimefon Controls Fusiform Rust in Young Slash Pine Outplantings. James D. Burton, Soil Scientist, Southern Forest Experiment Station, U.S. Forest Service, Pineville, LA 71360. Glenn A. Snow, Supervisory Research Plant Pathologist, Southern Forest Experiment Station, U.S. Forest Service, Gulfport, MS 39503. Plant Dis. 67:853-854. Accepted for publication 3 January 1983. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1983. DOI: 10.1094/PD-67-853.

Triadimefon, sprayed on slash pine (Pinus elliottii var. elliottii) seedlings immediately before outplanting and at 2-wk intervals from April through June, reduced incidence of stem and branch fusiform rust infections caused by Cronartium quercuum f. sp. fusiforme. After 2 yr, 28% of the unprotected and 2% of the protected trees had stem galls; differences associated with weeding, bedding, and fertilizer were not significant. In cultivated plots, 39% of the unprotected and 1% of the protected trees had galls in branch tissue formed during the second year, with no differences attributed to bedding or fertilizer. Further study is needed before general use of triadimefon in industrial and public reforestation can be recommended, but its usefulness in protecting research or other high-value pine plantings is indicated.