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Unlike the fearsome giant hornet, the wasp Leptopilina japonica is welcomed by entomologists. In Asia, it preys on SWD, an insect that attacks healthy fruit. At least one Leptopilina specimen was caught this year in Whatcom County, in a trap baited with orange juice and rice wine. The traps, set for giant hornets, drowned a melange of bugs, including millions of tiny SWD. The discovery of a Leptopilina potentially re-energizes using the parasitoid to control SWD in the U.S. Washington State University entomologist Elizabeth âBetsyâ Beers said she hopes the wasp can be captured, reared and released. âWeâd love to have some biological control,â she said. âEntomologists as a group tend to be very pro biological control.â ....