Abstract
Abstract Plant Introduction (PI) accessions of spinach (Spinacia oleracea L.) were evaluated for curly top resistance in greenhouse tests at Pullman and in field tests in the Columbia Basin near Basin City, Washington. In greenhouse tests of 185 accessions, possible resistance was observed in 4 that produced single symptomless plants, in 3 that survived long enough to produce some nonviable seed, and in 56 that produced dwarf green plants in which symptom expression and death were delayed. Of the 178 accessions observed in the field, 13 produced 1 symptomless pistillate plant each, 1 produced a single tolerant pistillate plant, and 1 produced 11 symptomless pistillate plants.
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