Does anyone know how to stop pine beetles?

Question:ive lost 5 pine treess in my yard due to pine beetles, i know that the trees need to be removed, but is there a pestacide to treat the healthy trees

Answers:
There are no practical and effective sprays or injections to stop an attack on green trees. Insecticides are not recommended once bark beetles have successfully attacked. Un-infested trees can be protected from beetle attacks by spraying with insecticides. When spraying, the entire trunk of the tree up to 4" diameter must be covered. This is a protective measure only. Insecticide will not kill beetles once they enter the tree. The available chemicals for this purpose can vary from year to year. You must use a product that is especially formulated for bark beetles. Typical home and garden insecticides will be ineffective. Check with your local county Extension office for current recommendations on the proper insecticides to use as a preventive measure.