Tree and shrub program

I’m in North Carolina and have been asked the last few years about treating client trees and shrubs. I have declined due to lack of ID knowledge and plant needs. Would like to learn enough to prevent problems and use IPM practices.

Was wondering if you might have some links or info on this topic? Maybe early spring systemic, spring Fert, fall Fert, winter horticultural oil??

Would think mostly what we would encounter is scale/sooty mold on crepes, white flies, bowwood leaf miners, ????