Status of bollworm, Helicoverpa zea, susceptibility to pyrethroids: IRAC-US 1998 update
Document Type
Conference Proceeding
Publication Date
12-1-1999
Abstract
In 1998, IRAC-US sponsored a bollworm monitoring program to determine if a widespread change in the susceptibility of the bollworm to the pyrethroid insecticides is occurring. Bollworm moths were collected and tested in Alabama, Arkansas, Georgia, Louisiana, Mississippi, Missouri, North Carolina, South Carolina and Texas. Over 10,200 moths were bioassayed from June through October 1998. Survival at the 5 μg/vial dose of cypermethrin ranged from a low of 0% to a high of 21.2% in Louisiana during June. Louisiana (June and July), Alabama (July) and North Carolina (September) were the only collection locations to exceed 10% survival at the 5 μg/vial dose. Survival at the 10 μg/vial dose of cypermethrin ranged from 0% to a high of 4.9% in Alabama during July. Alabama (July), Louisiana (July) and North Carolina (September) were the only three collections to exceed 2% survival at the 10 μg/vial dose. The increasing tolerance of the bollworm to the pyrethroids demonstrated in this study, suggest that maintaining the effectiveness of the pyrethroids against the bollworm should become a higher priority in future resistance management plans.
Publication Source (Journal or Book title)
Proceedings of the 1999 Beltwide Cotton Conference, January 1999, Orlando, Florida, USA
First Page
867
Last Page
871
Recommended Citation
Martin, S., Bagwell, R., Boyd, M., Freeman, B., Herzog, G., Johnson, D., Layton, M., Leonard, B., Liu, N., Payne, G., Pietrantonio, P., Roof, M., Sullivan, M., Van Duyn, J., & Weeks, J. (1999). Status of bollworm, Helicoverpa zea, susceptibility to pyrethroids: IRAC-US 1998 update. Proceedings of the 1999 Beltwide Cotton Conference, January 1999, Orlando, Florida, USA, 867-871. Retrieved from https://repository.lsu.edu/entomology_pubs/1019