Are those Mauget?
I am pretty sure that it looked as good as yours did when it was being done
(by experience)
How would trunk injection be any less "menacing" to bees? The complaint I hear is it gets into the tree's flowers and the bees pick it up in the pollen. That will happen with either application method. Fair environmental argument would be application in sandy soil near surface water...making it likely to leech to that body of water.
Regarding effectiveness: I guess your study is better than OSU, Purdue, and MSU studies. They probably don't know how to set up control, or the like. I personally have plenty of examples where it has worked, and none where it hasn't if they stuck with the program. Unless you are in southern MI or Toledo, it has likely been here longer...so that is not a factor influencing those results.
Finally, to bring the 2 (wrong) points together. IF injections were more successful (which I am not agreeing they are...but you say so), wouldn't that be because there is more active ingredient delivered to the tree. If there is more imidacloprid in the tree, wouldn't that mean also, more in the flowers...therefore a bigger threat to bees??? Can't have it both ways: more chemical in trees, less problems for pollinators.
Probably...but nobody knows since EAB hasn't been studied for decades. Same would be true of all other treatments for Emerald Ash Borer.Are periodic imidacloprid injections an effective regimen over a long term measured in decades?
That is a function of how quickly the tree is growing, how many injection sites you are using, and how often you are injecting. If the tree grows over old sites more quickly than you need new sites, you can continue for perpetuity. Sure, there will be some minor decay pockets, but the holes are small enough to recover quickly. UNLESS, they look like the mis-applied arbor plug in the OP...then you will probably run out of injection sites about the same time the tree dies!Is it possible (like in the case of an old diabetic) to eventually run out of injection sites?
I know it is a completely different situation, but I've seen lumber sawn from butt logs of maple trees tapped for decades that looked very interesting. Almost like the tree was screaming for mercy; "stop the madness"
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