New Races 5 and 6 of Phytophthora megasperma var. sojae and Differential Reactions of Soybean Cultivars for Races 1 to 6

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Abstract
Soybean (Glycine max) hypocotyl-inoculation tests for vertical resistance were used to differentiate 2 new pathotypes of P. megasperma var. sojae that were different from races 1-4 and are proposed as races 5 and 6. Eight different soybean resistance-susceptibility combinations were identified from differential cultivar responses to the 6 races.