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Bug zappers generally only zap the insects that are good - including the ones that eat the insects you're trying to get rid of.
Wasps (and other bugs) can be trapped - it's a special trap involving an inverted funnel inside a glass jar. You put sugar water inside it, and when the wasp flies in to eat, it can't get back out, falls in the water, and drowns. They're available from gardening stores/catalogs.
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