@Ray, I go to Kingwood Garden Center. For 19.99, they have Monterey Horticultural Oil. It controls Aphids, Mites, Scales Whiteflies, and Other soft boiled insects.One container will last you several years
I bought a sprayer just for this, because it is an oil.
@Fallon:
I use that stuff too. It's good for leaf miners. Kingwood Garden Center is a great place to ask questions about horticultural diseases. I have a small tree so I just use a spray bottle and wear gloves cause it's gets on your hands. 4951