Abstract
An isolate of Phytophthora megasperma f.sp. glycinea from soybean cv. Ridley growing near Forbes in the Lachlan Valley, New South Wales, was classified as race 4 after hypocotyl inoculation on a United States differential set consisting of Harosoy, Harosoy 63, Sanga, Wells II, PI 103091, PI 86972-1 and Altona. This is the first record of race 4 in Australia. The cultivars Nessen, Ridley and Lachlan, all immune to the other races of P. megasperma f.sp. glycinea in Australia (viz. races 1 and 15), were susceptible to the new race. The appearance of race 4 is undoubtedly due to the growing of cultivars with race-specific resistance.
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