Hi,

Live outside of Boston.

Have a few White Birch trees, some Maples and Oaks, and several trees that
I'm not sure what they are, frankly.

Some of the leaves, on most all of them, seem to be being "eaten," possibly
by aphids (someone thought, but wasn't certain), a bit..

Is there any spray that I can buy, that's effective of a real wide variety
of leaf-eaters, as well
as being near perfectly safe for all kinds of trees ?

Can it be used at any time of spring / summer ?

Much thanks,
Bob