Trees Susceptible to the Polyphagous Shot Hole Borer
...ropriate for the site and don’t require a lot of additional water. Provide appropriate soils and access for roots to grow and expand. Avoid excessive pruning, over- or under-watering, and planting inappropriate companion plants within the dripline. If trees are infected, systemic insecticides generally are poor for treating ambrosia beetles. Prophylactic spraying of the bark could be used to protect uninfected trees in some situations. Sterilize p...