North American Fruit Explorers mailing list at ibiblio

[Diane Whitehead <voltaire@islandnet.com>]

A few decades ago I used a very effective trap that had a wasp  
pheromone inside - the traps filled up with wasps every day.  I would  
carefully remove the small container of pheromone while I emptied the  
trap, and then put it back, being very careful not to get any on me.

I haven't used traps since, so I don't know whether these are still  
sold.

Diane Whitehead
Victoria, British Columbia, Canada