and I cannot bear the thought of a chemical treatment. At least until I've exhausted other options.
What should I do? Well of course turn to you for advice!
I am thinking she must have picked them up at the beach. Or from a walk in the neighbourhood. Temperatures here have hit the triple digits so I am thinking that may contribute to it. (Though I may be wrong.) In any case - how do I get rid of them (short of picking them off by hand and drowning them...) and how do I prevent them from coming back?