Long Tall Sally expounded:

You have the dreaded Marphistes aphids.

You back again? Crawl back under your bridge.

To the original poster, this joker is a troll. Don't do anything with
muriatic acid, the troll is just trying to hurt someone who doesn't
know any better.

As for your aphids, a hard stream of water will knock them off, if
necessary, use one of the soap solutions recommended for gardens.

--
Ann, Gardening in zone 6a
Just south of Boston, MA
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