Symptoms of Sorghum Downy Mildew on Maize Following Inoculations with Conidia and Oospores. Salumu- Shabani, Graduate Student, Department of Plant Sciences, Texas A&M University, College Station 77843. R. A. Frederiksen, Professor, Department of Plant Sciences, Texas A&M University, College Station 77843. Plant Dis. 66:1006-1008. Accepted for publication 8 March 1982. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-1006.

The response of four selected maize inbred lines inoculated in the greenhouse using conidia and oospores of Peronosclerospora sorghi was evaluated. Reaction of specific cultivars to infection with different spore forms of P. sorghi is important in screening for host resistance. The inbred Tx601 was resistant to both types of inoculum, whereas Tx441 was more susceptible to conidia than oospores. Irrespective of reaction class, systemically infected plants had different colonization symptoms.

Keyword(s): corn.