We have a row of hemlocks, and around the base of one of them lately there's a ring of sawdust. I've seen an ant or two in it, and our pile of firewood is close by, making me suspect an ant or termite eaten load that we had there last summer. But the ring is very neatly around the (so far) healthy hemlock. If this is ants or termites, can it be treated?

Treat the base and entry area with boric acid. Roach aid can be found at any hardware store. Repeat after rain and this should take care of the ants.

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