The cure for aphids is a licensed chemical application injected into the earth around the tree. February and March are the best time of year for application. In the event the homeowner misses the window for routine treatment, a licensed applicator can treat for aphids by using an additional treatment that accelerates the tree's absorption of the preventative. In those case, results can be seen within 7-10 days. The earlier treatment protocol is naturally a bit less expensive.
Consumers should be aware that argi-chemical treatments require a specially licensed applicator. The possession of the necessary aphid chemical treatments are restricted by law. Regrettably, many vendors skirt the law by using either colored water or hardware store insecticides. Verify that your applicator is licensed to dispense treatments.