|08-454 Project Manager: P. F. O'Leary|
HELICOVERPA ZEA PYRETHROID RESISTANCE MONITORING
Fred R. Musser, Mississippi State University and Ryan Jackson, USDA-ARS
Fred R. Musser: Mississippi State University
Bollworms develop on many hosts, with each generation likely to use a different host. Pyrethroid insecticides are typically used to control bollworms in cotton as well as in numerous other crops that are attacked by this insect. Therefore, selection for pyrethroid resistance within the landscape is potentially great even though there may not be much selection pressure in any single environment. Pheromone traps were monitored from May to September during 2007-2012 in nine states stretching from Virginia to Texas. Trapped healthy male moths were then tested for resistance to a pyrethroid insecticide. Average survival at a discriminating dose of 5 µg/vial of cypermethrin during 2012 was 14.8%. Average survival exceeded 20% only in Louisiana (35%) and Virginia (33%). Consistent with previous years, survival was highest in most states during July.
Within Mississippi, pheromone trap catches were monitored in 23 cotton-producing counties from May through the end of August for bollworm, tobacco budworm and beet armyworm and reported each week to growers. Densities for all three pests were typical during 2012, following two years of exceptionally high bollworm densities. Bollworm catches had four distinct peaks at each generation, but no clear generation peaks could be detected from the tobacco budworm and beet armyworm data.
|Project Year: 2012|
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