Monitoring for Pyrethroid Resistance in Bollworm ( Helicoverpa zea ) Populations in Texas: Trends from 2003-2005 Academic Article uri icon


  • The purpose of this study was to assess the susceptibility of the bollworm, Helicoverpa zea (Boddie), to the pyrethroid cypermethrin in the primary crop production areas of Texas. Pyrethroid insecticides are widely used in cotton and in other production systems, such as grain sorghum and corn. The statewide monitoring program that evaluated resistance in male H. zea was conducted from April to September 2005, surveying nine Texas counties with a total of 5,041 moths from all areas used for analysis. Data from all areas were sent to Texas A&M University Toxicology Laboratory for analysis. Considerable variability in response to cypermethrin was detected in H. zea across the state. Based on LC50 data, the most resistant populations were from Nueces, Uvalde, and Williamson counties while the most susceptible populations were from Ellis, Fisher and Mitchell, Hockley, and Swisher counties. Accepted for publication 2 October 2006. Published 19 July 2007.

published proceedings

  • Plant Health Progress

author list (cited authors)

  • Pietrantonio, P. V., Junek, T. A., Parker, R., Bynum, E. d., Cronholm, G., Moore, G., ... Troxclair, N.

citation count

  • 7

complete list of authors

  • Pietrantonio, Patricia V||Junek, Terry A||Parker, Roy||Bynum, Ed||Cronholm, Greg||Moore, Glen||Mott, Dale||Sansone, Chris||Siders, Kerry||Troxclair, Noel

publication date

  • January 2007