Injury to almond tree trunks during mechanical shaker harvest quickly attracts several insect vectors of the Ceratocystis fimbriata fungus. The American plum borer, Euzophera semifuneralis, a known Ceratocystis fungus vector, prefers to attack young, injured, or weakened trees wherever callous tissue has formed. When the insect bores through the trees wound-healing zone it could be an important means of introducing Ceratocystis spores long after a mechanical injury occurs. Trimming back crushed, torn, or loosened bark to well attached bark and treating the wound with an insecticide-paint or copper-oil reduces the number of plum borer strikes compared to untreated wounds. The number of Ceratocystis cankers that subsequently occur are also reduced by these treatments and the copper-oil treatment may provide benefits for several years.