1. UC IPM
Elongate, purse-shaped galls on the petiole of leaves of Lombardy poplar caused by feeding of poplar gall aphid, also called lettuce-root aphid and poplar-lettuce aphid, <i>Pemphigus bursarius</i>.
Elongate, purse-shaped galls on the petiole of leaves of Lombardy poplar caused by feeding of poplar gall aphid, also called lettuce-root aphid and poplar-lettuce aphid, Pemphigus bursarius.
Credit: Jack Kelly Clark