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Consistent Infection of Corn Seedlings with Oospores of Peronosclerospora sorghi. Jeweus Craig, Research plant pathologist, Agricultural Research Service, U.S. Department of Agriculture, Plant Sciences Department, Texas A&M University, College Station 77843; Phytopathology 73:1177-1179. Accepted for publication 23 March 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/Phyto-73-1177.

Oospores of Peronosclerospora sorghi were produced in leaves of infected sorghum plants in the greenhouse. The leaves were harvested 5- 6 wk after the plants were inoculated with conidia, dried at 35 C, and stored at 5 C. The dried leaves were shredded in a Waring blender and mixed with potting soil. Seeds of corn and sorghum were planted in the infested soil. The oospore inoculum consistently induced high incidences of sorghum downy mildew in susceptible corn genotypes, but was much less effective in tests with susceptible sorghum genotypes.