Evidence for Decreasing <i>Helicoverpa zea</i> Susceptibility to Pyrethroid Insecticides in the Midwestern United States

Fig. 2. Increasing survival of H. zea to cypermethrin, from 1988-2005 in Louisiana, based on results of adult vial tests (AVT) with cypermethrin (5 µg/vial).



Image from Plant Health Progress article:
Evidence for Decreasing Helicoverpa zea Susceptibility to Pyrethroid Insecticides in the Midwestern United States