In this photo released by the University of Florida’s Institute of Food and Agricultural Sciences, entomologists Phil Koehler, left, and Barbara Bayer, check the effectiveness of different bait pest control products on German cockroaches in a laboratory experiment – Nov. 21, 2006. Koehler and Bayer said that the roaches are avoiding some baits now on the market, and their research will help find new or improved bait chemicals that the pests will readily consume.

(University of Florida/IFAS/Josh Wickham)
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