> Second, another walnut tree a few houses down has a gypsy moth nest
> among its branches. *Any advice on how this investation oughta be
> dealt with, and how to persuade the owner to deal with it ?
>
> Yours, John Desmond

Tent caterpillars - just cut off the part that is "tented," and burn
it. If that doesn't work, call your county extension office.

N.