When to spray maple trees and what to use.
I bought young "autumn blaze" maple trees (8-10 feet tall) and planted them in spring 2019. The garden center where I bought them said they need to be sprayed but now I can't find the information guide they gave us with the trees. I'm wondering when the maple trees need to be sprayed and what to use on them.
Mesa County Colorado
Are they recommending Iron? Maples have a hard time accessing the iron in our soils due to our high pH. they prefer more acidic soils. You want to apply foliar sprays containing ferrous sulfate or chelated iron. The product will have instructions on it.
Spray after the leaves have fully emerged, so probably by the end of May.