Fig 4. Probit mortality plots of bifenthrin determined by lethal concentration bioassays for adult WCR field populations from Keith and Perkins Counties, NE and a non-diapause laboratory colony (CCh) considered susceptible.

Field collections and bioassays performed in 2014. Vertical dash-line represents the diagnostic concentration (LC₉₉) of 0.77 μg/vial calculated from the 10 pooled lab colonies (Table 1).