Rot on base of young ash

[Robb2014]

Hi, I went out to treat my ash with Imidacloprid (Bonide Tree and Shrub Insect Control) after finding a group of 4 or 5 ash down the block from me infected with Emerald Ash Borer, and saw this area of rot at the bottom of the trunk. I dug some of the rotted wood out and saw it had the tiny white worm shown in the 2nd pic and the tiny white crawling insect in the 3rd pic. I'm in the Chicago suburbs and it's been very wet here this spring. This ash was planted 8 years ago as a 2 or 3 inch tree and it's now 8 inches in diameter. Does anyone know what this is and how to treat it? Will an Emerald Ash Borer infestation cause this type of rot? Whatever the problem is, it hasn't seemed to have affected the tree yet as it's very robust without a single dead branch.

 

After I did the Imidacloprid treatment it rained really hard about 5 or 6 hours later then rained again the next day. I'm wondering if I should give the tree another treatment.

[treeseer]

that's an old wound with scavengers. Scrape off loose rot and hose it and don't worry about it. re imidacloprid, read the label.

[Robb2014]

that's an old wound with scavengers. Scrape off loose rot and hose it and don't worry about it. re imidacloprid, read the label.

 

Thanks... I was hoping that was the case. You can probably see where someone hit it with the string trimmer several years ago. Regarding the imidacloprid, the label really doesn't address reapplication in the event of a heavy rain following treatment. I'm leaning towards treating it again. There's a group of 5 adult ash that have been destroyed by emerald ash borers about a thousand feet from this tree. I'd really hate to see this beautiful tree infected.