Status of bollworm, Helicoverpa zea, susceptibility to pyrethroids in the Mid-South and Southeast: IRAC-US 1999 update
Document Type
Conference Proceeding
Publication Date
1-1-2000
Abstract
In 1999, 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, Florida, Georgia, Louisiana, Mississippi, Missouri, North Carolina, South Carolina, Tennessee and Texas. Over 7,400 moths were bioassayed from May through October 1999. Survival at the 5 μg/vial dose of cypermethrin ranged from a low of 0% to a high of 34% in Missouri during June. Five states, Alabama, Louisiana, Missouri, North Carolina and South Carolina had greater than 10% survival during at least one month. Louisiana had greater than 10% survival at the 5 μg/vial dose from May through August. Survival at the 10 μg/vial dose of cypermethrin ranged from 0% to a high of 25% in South Carolina during June. Three collections: Louisiana (July), Missouri (June) and South Carolina (June) exceeded 15% 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)
2000 Proceedings Cotton Conferences Volume 2
First Page
1359
Last Page
1365
Recommended Citation
Martin, S., Bacheler, J., Bagwell, R., Boyd, M., Freeman, B., Herzog, G., Johnson, D., Layton, M., Leonard, B., Liu, N., Payne, G., Pietrantonio, P., Roof, M., Seward, R., Sprenkel, R., Sullivan, M., Van Duyn, J., & Weeks, J. (2000). Status of bollworm, Helicoverpa zea, susceptibility to pyrethroids in the Mid-South and Southeast: IRAC-US 1999 update. 2000 Proceedings Cotton Conferences Volume 2, 1359-1365. Retrieved from https://repository.lsu.edu/entomology_pubs/1000