Effective traps to attract and capture the emerald ash borer (EAB) are a key element of detecting and managing this invasive pest. Double-decker traps, placed in full sun near ash trees, incorporate visual and olfactory cues and were more likely to capture EAB than other trap designs in field trials.
McCullough, D. G., Poland, T. M. Building Double-decker Traps for Early Detection of Emerald Ash Borer. J. Vis. Exp. (128), e55252, doi:10.3791/55252 (2017).