Phytophthora sojae is a variable pathogen with over 55 races reported. Surveys conducted over 10 years ago found 6 races and 6 additional pathotypes in soybean fields in Arkansas. Resistance is conferred by a number of race specific RPS genes and non-specific resistance may also be present. The numerous resistance genes for Phytophthora root and stem rot and highly variable pathogen make screening for resistance to current races of the pathogen critical.
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#soybean diseases