Wooly Agelard Question For Hemlock In Boston Area ?

Hello:
Live 25 miles due west of Boston.
Have a massive Hemlock, that an arborist says has some wooly agelard bug infestations. Not sure if he's right or not
Anyway, i'm willing to blow a few hundred to have it treated.
My question is:
Is this the best and "right" time of the year to have it sprayed here in the northeast ?
If so, what with (just leave it to him, or tell him I want the oil spray, or...what ?) ?
Much thanks, Bob
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If you buy yourself what's called a Trombone Sprayer you can reach very high into the tree. It costs about 75 dollars for a good one. Insecticidal soap works very well on wooly adelgid, particularly on hemlocks. You'd need to do about three applications, 6 days apart and wait to see what the results were. This is a good time to do it.

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