Your trees will never fully recover and will always look distorted. When you saw the problem you should have had an onsite inspection by a Certified Arborist. Since you had no idea what was wrong with your trees you lost precious time spraying them with products that probably did nothing to help them. Sevin is a very toxic pesticide and All Seasons Oil is also used for small insects. I suggest you have the soil tested before you replant. Best And Happy Yardening, Nancy.