Perhaps the most frustrating pests to deal with are aphids. They produce a heavy amount of honeydew when they are feeding, which gets on our cars, decks, sidewalks and more.
Overall, the majority of trees will be able to fend off aphids when they attack. They might look a little thin in appearance, but should recover on their own. However, treating trees for this pest to reduce the honeydew accumulation is what most people are concerned about.
There are a number of products available in the nursery trade labeled for aphids. Most come in the form of an aerial spray or a soil drench product. To be most effective, these products should be applied before peak activity occurs. Unfortunately, these products kill desirable insect species as well, such as butterflies and ladybugs.