Dilatory Blast Resistance in Rice Lines Exotic to the Southern United States. M. A. Marchetti, Research Plant Pathologist, Agricultural Research Service, USDA, Texas A&M University Agricultural Research and Extension Center, Beaumont 77706. Plant Dis. 67:1362-1364. Accepted for publication 21 June 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-67-1362.

Twenty-five rice cultivars from Japan, Egypt, Turkey, and China were evaluated for dilatory resistance to rice blast in blast nursery “miniplots” in Beaumont, TX. As a group, the Japanese cultivars, selected for high field resistance to blast in Japan, were the most blast-resistant here. The single Chinese entry, Nanjing 11, was also highly resistant. Two Turkish cultivars, Akceltik and Sariceltik, were significantly more susceptible to blast than an American susceptible check cultivar, M-101. The Egyptian cultivars, as a group, were significantly more susceptible than the Japanese cultivars but more resistant than two of three Turkish cultivars.

Keyword(s): general resistance, Pyricularia oryzae.