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Detecting Wheat Leaf Rust Resistance Gene Lr 13 in Seedlings. Z. A. Pretorius, Rotary Scholar and Agricultural Researcher, Small Grain Center, Bethlehem 9700, South Africa. Roy D. Wilcoxson, Professor, Department of Plant Pathology, and D. L. Long and J. F. Schafer, Plant Pathologists, Cereal Rust Laboratory, USDA, ARS, University of Minnesota, St. Paul 55108. Plant Dis. 68:585-586. Accepted for publication 12 January 1984. 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, 1984. DOI: 10.1094/PD-68-585.

The adult-plant wheat leaf rust resistance gene Lr 13 was detected in seedlings of wheat (Triticum aestivum) at 25.5 C but not at 18.1 C when inoculated with Cereal Rust Laboratory culture no. 82-BHL-MD of Puccinia recondita f. sp. tritici. Cultures of P. recondita f. sp. tritici were separated into two groups on the basis of their virulence to Lr 13 at 25.5 C.