Hello:

I live 25 due west of Boston.

Have a massive Hemlock in my backyard.

Have just begun to notice that "some" of the needles are turning from green
to orange.

Know nothing about trees, but would sure love to keep this one healthy.
Can't remember if this happened last year, or in years past; uncertain
about.

a. Is this turning of color normal for this time of the year here in the
northeast ?

b. Might it be due to this wooly agelard infestation; would this also cause
the color change ?

Much thanks,
Bob