Tree fertilization cost
Hi guys, long story short I have a Japanese maple that started wilting last year and had a forester come. He did some pruning and fertilized all the trees around the property. Then spring came and more branches were bare. He followed up, said it was the burn from winter and pruned more branches, also fertilized all the trees again and asked for $650 for fertilization application. I don't know much about fertilizers used by professionals but that sounds outrageously expensive for just slow release fertilizers.
I've attached the pic of fertilizer I see, there are <20 such applications in total, don't see different kinds of fertilizers used.
Also attached the pic of the tree bark from last year(apologies forgot to take a more recent pic), looks really similar to Verticillium wilt someone posted.
What is a reasonable price for tree fertilization? Is he BS me on both fertilization and the condition of the tree?
Ty in advance!