I'll provide some info here since it may be useful to others. Bayer sells 2 products in big box stores that they recommend for treating EAB; #1 - Bayer 12-month Tree & Shrub Protect & Feed and #2, Bayer 12-month Tree & Shrub Protect & Feed II concentrate. Both products contain .74% Imidacloprid and 2-1-1 (NPK - I guess the FEED part; actually, it is believed nitrogen enhances the uptake of the insecticide.) The Protect & Feed Concentrate II also contains .37% clothianidin (another insecticide with a half life of up to over 1100 days & suspected to contribute to Colony collapse disorder of bees (CCD). It would seem the II Concentrate product would be superior since it contains additional insecticide; both these products are suggested to be used as a soil drench or bark/basal drench in the early spring since it may take up to 60 days to uptake throughout the entire tree. If bores drill into the bark to lay eggs in the vascular system, the young larva get zapped by the chemical when they begin to tunnel across the vascular system. Directions say use 1 oz of either product for each inch of the circumference (not the diameter) of the tree. You would then mix the product in 1 gallon of H20 (2 gal if a bigger tree with more inches) and spread it as a soil drench around the tree and close to the trunk OR spray the same amount of chemical on the trunk of the tree from the base upward to the DBH (4.5 feet) ... saturating the bark. The bark drench probably doesn't work as well on older, big trees because their bark is heavy and may retard the uptake of the chemical. A gallon of the Protect & Feed II Concentrate frequently sells for $80-$100. Since I prefer a heavier %/chemical treatment, and I don't want to pay a bonus for ready-mix product that has 2-1-1 in it, I would consider Dominion 2L or Prokoz Zenith 2F (Bayer product) that I can purchase in quantities from 27 oz to 128 oz. Actually, there are aother providers of Imidacloprid; these are just 2 examples. Both cthese products are 21.4% solutions; you have to calculate the mix rate depending on the %-treatment-solution you want (bigger trees 30-40 inches DBH) probably need a 2.5-3% solution whereas smaller trees (e.g., 4 inches DBH) might be treated with a 1% - 2% solution. Google Prokoz Zenith 2F and read the instructions describing how to use the product. I have my own system for treating my big tree (45-inches DBH - 4.5 feet up the trunk); I mix a soil drench (gottum big/heavy bark on old tree not good for bark drench) with product containing the %-solution I want in a gallon of water and then and mix 1/5 of my product (solution) with water in each of 5, 5-gallon buckets (4+ gallons of water in each bucketful). 8-10 gallons (2 bucketful) of mixed solution are distrubuted (poured) on the soil around the tree within 12-20 inches of the trunk. The remaining 12-14 gallons of mixed solution are distributed equally between 3=6 feet out from the trunk. My system ain't ( mix rate and distribution method) what the label recommends; however, it works well for me). Finally, I throw a couple of handfuls of spring fertilizer on the treatment areas for nitrogen. This all may sound somewhat complex; it is really very simple to calculate and easy to mix and apply ... AND it is a whole lot cheaper. For example, Seed Ranch advertises 128 oz of Prokoz Zenith 2 F for $89 with free shipping. That much product of 21.4% Imidacloprid (remember, you'r going to cut it) would allow you to treat a bunch of ash trees for several years unless you got a bunch of big trees. You can probably find Dominion 2L much cheaper and in liquid quantities as small as 27oz. Sorry the post is long; hope it is clear. Good luck!
One final note; since your trees are in a fence row you probably should try to apply chemical as close to anticipated rainfall as possible, unless you can transport water to the tree (watering the product in helps uptake).
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