I live in Farmington Hills, MI. I am trying to save a few sets of boxwood shrubs which I have been told by my arborist have had Boxwood Leafminer damage, among other pests. I think the company dropped the ball this year, as the foliar Imidicloprid spray (to my recollection) should have been in the early part of spring. I trimmed one of the hedges back several inches in April (on their advice), but not the other, since I did not get to it before they began to leaf out. So on the one hedge, there is not much live growth to take the foliar treatment anyway. I hesitate to pay the cost the Arborist would charge at this point partially because of that, but also now that is so late in spring, it may be futile. Before I lose the hedges completely, I plan to repeat a Fertilome soil drench that I did last year. Before I purchase another bottle, I Googled "best time to apply soil drench". One search result urged checking with the state extension service. So, that is why I am contacting you - to find out if it is too late in the spring for a soil drench of Imidicloprid to be effective, . . . or if it would still be worth the time and effort to do the soil drench on my own. I fired Davey Tree for dropping the ball last year, and now it looks like Owen Tree is doing the same. My husband are finding it very hard to keep our aging property up, and I appreciate any advice you can offer.