Inhibition of Venturia spp. by Analogues of Host Metabolites

Abstract

THE significance of host metabolites in the host relations of Venturia inaequalis and V. pirina, the causal fungi of apple and pear scab respectively, has already been reported¹. Further studies have shown that, of the main components of the mixtures of plant phenols in the apple and pear, compounds of the chlorogenic acid type, that is, depsides, probably play an important part. They are toxic to the pathogens at low concentrations, but do exhibit some phytotoxicity when injected in vivo.