The Mode of Action of Phosphite: Evidence for Both Direct and Indirect Modes of Action on Three<i>Phytophthora</i>spp. in Plants

Abstract

Results suggest that the concentration of phosphate present at the infection site influenced the degree to which phosphite protection was observed in treated plants. In the three fungal-plant combinations examined, phosphite concentrations were sufficient to reduce fungal growth by direct action. However, plant defenses would be important in completely arresting pathogen invasion