Interesting to read about the infestation of trees with ALH beetle.

Have seen somewhere in the distant past a reference where I think
Imidacloprid was used to treat Elms with Dutch Elm Disease - shall dig
it out and post the ref.

After treatment, the trees were found to still contain the molecule a
year after and did not require retreatment.(to be confirmed)

So, if maple trees are to be treated (or any trees that are attractive
to bees) then look out for intoxication - most probably sub-lethal
intoxication.

I can easily see the reasons for treating as a curative measure, one
that is most probably going to be restricted in time and area. Just that
any damage to bees should also be taken into account.

It is the way that bees are considered dispensible that has got to
change esp. when individuals are trying to make a living from them.

Peter

P.S.75% effective you say, sounds like they are not going to solve the
problem with Imidacloprid either but should do the sales a good boost -
usual story!