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Disease Control and Pest Management

Similarities Between the Fungicidal Action of Isoprothiolane and Organophosphorus Thiolate Fungicides. Masako Katagiri, Department of Phytopathology and Entomology, National Institute of Agricultural Sciences, Nishigahara, Kita-ku, Tokyo, 114 Japan; Yasuhiko Uesugi, Department of Phytopathology and Entomology, National Institute of Agricultural Sciences, Nishigahara, Kita-ku, Tokyo, 114 Japan. Phytopathology 67:1415-1417. Accepted for publication 16 June 1977. Copyright © 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-1415.

A similarity in the mode of action of isoprothiolane and organophosphorus thiolate (PTL) fungicides in Pyricularia oryzae is suggested because cross resistance was found between them, and synergistic joint action and negatively correlated cross resistance also were found between isoprothiolane and phosphoramidate (PA) compounds as in the case of the PTL fungicides and PA compounds.