I'm sure that this has been posted before: I'm adding tree and shrub spraying to my list of services and would like to come up with an easier way of pricing the service for bids. I like the idea of 'sizeing' the trees and shrubs, eg. Lg med and sm. and asigning a price that way. How many gallons used are typical for differing sizes? what/how do you charge? Anybody use micro-injection?