recent arrival of giant snails to Orchidland

[myomy]

When I lived in Brazil, these were a major problem. See:
http://news.nationalgeographic.com/news/...nails.html

At night, our ornamental garden might have 50-100 happily munching away.

I found a good ecologically benign way to control them was to fill a spray bottle with a mix of 50/50 ammonia and water. Spray snails with a stream of the solution. Snails sort of 'melt' like having had salt put on them.