Populations of Phytophthora sojae
	l P. sojae is genetically diverse l P. sojae exists on each site as many different forms arising from· l Sexual products (offspring) l Mutation l Types may be distributed across a field. l Dominant types are determined by what they can eat. l Only the types will prosper that can survive on the varieties of soybean planted. l These genetically different types are called races