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Streptomycin Inhibition of Peronospora parasitica and its Host Reversed by Manganese and Calcium. Dorothy McMeekin, Department of Natural Science, Michigan State University, East Lansing 48823; Phytopathology 63:34-36. Accepted for publication 13 July 1972. DOI: 10.1094/Phyto-63-34.

Spore germination and systemic growth of Peronospora parasitica in the cabbage host, the growth of cabbage roots, and the growth of Pythium aphanidermatum are inhibited by streptomycin. This inhibition is reversed by calcium and manganese, indicating that the mode of action of streptomycin in these species is similar. Studies on the action of streptomycin in fungi and higher plants should always indicate calcium and manganese levels.

Additional keywords: obligate parasitism, Oomycete.