We don't have EAB here yet, but we do have what are called lilac/ash borers. We have Phaenops gentilis, Chrysophana placida and Agrilus cyanescens. Many non native trees do need help here, but you don't know specifically what to add without a soil test. Unfortunately, they are not free here, but the cost is nominal, maybe $25-30 depending on what you're testing for. I would take soil samples from areas where you haven't fertilized. I just don't see wasting money on additives until you know what's missing from your soil, or what nutrients you already have enough of. I would also be extremely careful with fertilizing right now as we are in severe drought status. If you feel like you need to fertilize before you have soil test results, maybe do half strength. Any problems you're seeing now are most likely drought related as we've had virtually no rain, horrific winds and weeks in the high 90 - 100+ degree temps. We have a 50% chance of rain this weekend, which would certainly help. We've had roughly 4.5" of precip. so far this year. Your soil ph is most likely in the 7 range, as mine is 7.9. I have a Patmore ash, fraxinus pennsylvanica 'Patmore' planted 4-5 years ago and I've not ever fertilized it. It's doing fine. Your ash looks good to me. The native tree choices here are limited which is why we bring in non-natives. FWIW I don't have 10 years experience, just 5, but have planted and killed enough trees that maybe I'm not a newbie anymore, lol. I'm still learning and will be for life. This is a tough place to learn the ropes, but you're doing great. I love your yard! Barb

Cork tree - Phellodendron amurense. It is pretty common in MN as a street tree and is actually becoming invasive in some areas.

Hi Goodplantz, was hoping to see a reply, as I would like to know the differences also. I am not very familiar with Ash trees in our area. I do know the Shamel has been hit with a bug in some areas of the valley. There are people on the Dave's Garden website, Southwestern Gardening Forum that have knowledge on ash trees.

Some trees may exhibit natural resistance, oikos in michigan was selling seed of an Asian species listed as this: "Fraxinus rhynchophylla Immune to Emerald Ash Borer This is the only ash species left at our farm after the emerald ash borer came and went. I really couldnâÂÂt understand why until I tried to prune a few branches off this species and found even with really good loppers the density and toughness of the wood is quite challenging to clip. ( A lot like pruning apricots. ) I was fortunate to get this seed many years ago from Korea where this mountainous species is found throughout China into zone 5. Ours selections are kind of slow growing compared to green ash but easy to establish in dry or poor soils low in organic matter. Late to leaf missing frosts and completely immune to the borer as far as I am aware. "