1. UC IPM
Dark brown, dying tissue just under the outer bark of a walnut tree due to shallow bark canker, <i>Brennaria nigrifluens</i> =<i>Erwinia nigrifluens</i>.
Dark brown, dying tissue just under the outer bark of a walnut tree due to shallow bark canker, Brennaria nigrifluens =Erwinia nigrifluens.
Credit: Jack Kelly Clark