Leaves that are blackened and fouled by honeydew are characteristics of the presence of pear psylla, <i>Cacopsylla</i> (=<i>Psylla</i>) <i>pyricola</i>.
Leaves that are blackened and fouled by honeydew are characteristics of the presence of pear psylla, Cacopsylla (=Psylla) pyricola.
Credit: Jack Kelly Clark