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Influence of Temperature on Development of Puccinia recondita with Triticum aestivum ‘Suwon 85’. L. E. Browder, Research plant pathologist, U.S. Department of Agriculture, Agricultural Research Service, Department of Plant Pathology, Kansas State University, Manhattan 66506; M. G. Eversmeyer, Research plant pathologist, U.S. Department of Agriculture, Agricultural Research Service, Department of Plant Pathology, Kansas State University, Manhattan 66506. Phytopathology 77:423-425. Accepted for publication 29 July 1986. 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, 1987.. DOI: 10.1094/Phyto-77-423.

Triticum aestivum ‘Suwon 85’ and ‘Thatcher’ seedlings were inoculated with four uredial cultures of Puccinia recondita and grown at 5, 12, 19, and 26 C. No classifiable differences in infection type were observed between Suwon 85 and Thatcher with any of the four cultures at 26 or 19 C. In some replications, small differences in infection type occurred between the cultivars at 19 C, regardless of culture. At 12 C, each of the cultures consistently produced an intermediate infection type with Suwon 85. In some replications at 12 C, some of the cultures produced more sporulation with Suwon 85 than did other cultures. Much greater differences in infection type between Suwon 85 and Thatcher with each of the cultures occurred at 5 C. Each culture with Suwon 85 produced nonsporulating infection types in the time required for the same culture and Thatcher to produce profuse sporulation. Testing at low temperature may provide an efficient means of selecting slow-rusting lines. Differences in infection type between different cultures with Suwon 85 suggest specificity of the slow-rusting character of Suwon 85 with P. recondita.