The glass jar works well where there is only one entrance available. I use a cup of ammonia on ground nests and cover with a piece of plastic to hold the fumes. Not polluting like gasoline, it becomes fertilizer for the grass. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ + Raymond J. Lackey + + Beekeeper 10 years with 25 colonies on Long Island, NY+ + INTERNET: [log in to unmask] + + Mail: 1260 Walnut Avenue, Bohemia NY 11617 + + Home Phone: 516-567-1936 FAX: 516-262-8053 + ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++