| Autor: |
Hopkins, Bradley W., Pietrantonio, Patricia V., Bright, Lindsay, Minzenmayer, R. R., Moore, Glen, Parker, Roy D., Pitts, Terry, Reed, Blaine, Ripple, Jared, Sansone, C. G., Troxclair, Noel, Vandiver, Monti, Vargas-Camplis, Jesus |
| Zdroj: |
Proceedings of the Beltwide Cotton Conferences: Cotton Insect Research & Control Conference; 2010, p1265-1277, 13p |
| Abstrakt: |
A monitoring program evaluated the susceptibility of male bollworm, Helicoverpa zea (Boddie), populations to the pyrethroid insecticide cypermethrin using the adult vial test. Moths were trapped near cotton fields using a synthetic pheromone trap and glass vials coated with different concentrations of cypermethrin dissolved in acetone were used to assess moth mortality. Nine Texas counties were surveyed, along with Tifton in Oklahoma and Tamaulipas in Mexico, from April to September in 2009. Data were collected from all collaborators and sent to the Insect Toxicology Laboratory (AgriLife Research) for estimation of lethal concentrations (LC50 and LC90), calculation of resistance ratios, and likelihood ratio tests of equality and parallelism. Uvalde and Nueces County populations exhibited the highest LC50 resistant ratios of 9.1 and 7.6, respectively. There were only two moth survivors at 60 µg/vial, the highest dosage tested, and none at 30 µg/vial, out of nearly 4,500 moths tested. Generally, populations monitored across other counties maintained susceptibility, and populations' resistance levels for the state of Texas were similar to those observed in 2008 and lower than those registered in the previous several seasons. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
