Abstract
Roots of peach trees in 10 commercial orchards with a history of peach tree short life were assayed for Fusarium, Pythium and Phytophthora spp., Criconemella xenoplax, and feeder root necrosis. Pythium and Fusarium spp. were common in peach feeder roots, but Phytophthora spp. were not isolated. C. xenoplax, the predominant plant-parasitic nematode, occurred in more than 50% of all soil samples. Feeder root necrosis was severe in the presence of C. xenoplax but was not influenced by DBCP [dibromochloropropane] application.