I know that most here apply with either backpack or small conventional sprayers if you spray at all . After viewing threads for awhile the question comes to mind quite a few of this forums members have considerable more trees than the average backyard grower . Have you ever considered or looked into mist blowers for your orchards , they can be a real game changer by depositing materials better and actually allows less chem for desired results . There are low cost machines out there that will fit four wheelers or small tractors and provide much better control for critical spray events . Just some random thoughts