Disease risk prediction evaluations for phytophthora root rot of chickpeas

Abstract

Key findings •• Phytophthora medicaginis (Pm) inoculum concentrations decline to low levels (within 6−12 months) of a diseased crop and the distribution becomes more uneven. •• Within 6−12 months, survival populations of Pm (oospores) can be below detectable levels based on both soil DNA and isolate baiting methods. •• These inoculum decline factors limit the ability of PreDicta B to identify paddocks that have a significant disease risk. •• The Pm test is useful for in-crop disease diagnosis when the pathogen is active and inoculum decline has not taken place.