First report of Phytophthora boehmeriae on black wattle in Brazil

摘要

Black wattle(Acacia mearnsii)is an Australian tree species cultivated in several countries.In Brazil,particularly in Rio Grande do Sul State(RS),approximately 140 000 ha are cultivated for tannin extraction(Dos Santos et al.,2005).The gummosis complex,which has Phytophthora nicotianae as one of the causal agents,is the main disease of black wattle in Brazil and is characterised by lesions at the trunk base with gum exudation(Dos Santos et al.,2005).