it's probably for very dry areas and without much clay

Ash tree needs to be over age six or have 1 in trunk circumference, EAB does not waste their time with younger than that. Any early isolated crown leaf loss between July and September is sign of that year's EAB activity. Everything ash trees and how to patriotically protect one. scottieashseed.wordpress.com One should never see premature leaf drop on a correctly treated tree. No excuse whatsoever to witness continued decline unless improperly inoculated. As an arborist who successfully protected dozens and dozens of ash trees here in Chicago. Best suggestion I could give you is to immediately "proactively" self drench any ash you wish to retain. One can purchase generic imidacloprid powder packets for $40 or less, enough to treat six 45 year old trees. Or enough to protect one individual applying medium high dose rate for the next 6 years. Treatment not only fully protects a tree, it also transforms them into large emerald ash borer bug zappers helping to lower local EAB numbers below fatal damaging infestation population levels. Trees survive first five years because they can easily recover from low populations. So it's not a matter of accumulated damage, but in reality exponentially building populations reaching what we call the four year death curve.

Ljudmilla Mihhalko it isn’t the beetle in Europe but a fungus instead, Europe’s ash trees are much more resistant