Susceptibility (± 95% Confidence Interval) of western corn rootworm neonates by contact to bifenthrin of laboratory colonies from Brookings, SD, including one from a commercial vendor, and from field populations.

aTotal number of neonates testedbWCR lab colony from USDA/ARS North Central Agricultural Research Laboratory, Brookings, SDcWCR lab colony from Crop Characteristics, Inc., Farmington, MN*WCR field populationsResistance ratios compared with lowest non-diapause LC50; bioassays conducted in 2014, except Kansas populations were conducted in 2015.