1. UC IPM
Crown of apple tree with Dematophora root rot, <i>Rosellinia</i> (=<i>Dematophora</i>) <i>necatrix</i>, with bark cut away to expose a canker and white mycelia of the pathogen.
Crown of apple tree with Dematophora root rot, Rosellinia (=Dematophora) necatrix, with bark cut away to expose a canker and white mycelia of the pathogen.
Credit: Ronald H. Tyler