Abstract
Race 4 of Peronospora farinosa f. sp. spinaciae was identified on spinach in California and Texas. Differential cultivars used for race identification included Viroflay (susceptible to races 1, 2, and 3), Nores (resistant to races 1 and 2), Califlay (resistant to races 1 and 3), and Polka and St. helens (resistant to races 1, 2, and 3). All five differentials were susceptible to race 4. All five isolates recovered from spinach in California were identified as race 4. A sugar beet isolate from California did not infect any of the spinach differentials. Of the five isolates recovered from spinach in Texas, two were identified as race 4 and three were identified as race 3 (...)
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