Submitted to: Journal of Stored Products Research
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: August 12, 2007
Publication Date: April 30, 2008
Citation: Arthur, F.H. 2008. Efficacy of chlorfenapyr against Tribolium castaneum and Tribolium confusum (Coleoptera: Tenebrionidae) adults exposed on concrete, vinyl tile, and plywood surfaces. Journal of Stored Products Research 44:145-151. Interpretive Summary: Phantom® is a new insecticide that specifically targets insect metabolism, and is registered to control termites, cockroaches, and ants. If this chemical could be registered to control stored-product insects inside facilities where processed food is stored, it would enable the use of an insecticide that would be of limited danger to humans. Since there are no published data for stored-product insects, adult red flour beetles and confused flour beetles were exposed on concrete, tile, and plywood surfaces treated with Phantom®. The insecticide was more effective on concrete compared to tile and plywood, and the red flour beetle was more susceptible than the confused flour beetle. Most beetles died within 1-7 days after they were exposed on the treated surfaces. Results show that this insecticide can be incorporated into management plans for stored-product insects in food processing facilities, and the insecticide label is being amended to include control of these insects.
Technical Abstract: The insecticidal pyrrol chlorfenapyr was applied to concrete, tile, and wood surfaces, at an application rate of 0.11mg AI/cm2. Adult Tribolium castaneum (Herbst), the red flour beetle, and adult T. confusum (DuVal), the confused flour beetle, were exposed for 2 and 4 hours, removed, and held without food for 7 d post-exposure. All beetles survived the initial exposures, but survival of both species decreased during the 7-d holding period, with T. confusum being the more susceptible species. In general, survival was lower on concrete than on tile or plywood, and on all three surfaces, survival was greatly reduced after 4 h of exposure compared to 2 h of exposure. Survival of T. castaneum after 2 h of exposure on concrete, tile, and plywood was 2.5 ± 2.5%, 25.5 ± 15.4% and 40.0 ± 7.1% respectively, after seven days. In contrast, all T. confusum exposed on concrete and tile were dead after 4 and 5 d, respectively, while survival on wood after 7 days was 20.0 ± 16.8%. After 4 h of exposure, all T. castaneum and T. confusum exposed on concrete and tile were dead after 2-4 d post-exposure, while survival on wood after 7 days was 41.5 ± 6.4 and 0 for each species, respectively. Non-linear and linear regressions were fit to the data for both species. Results show exposure to chlofenapyr is effective against T. castaneum and T. confusum, but efficacy will vary depending on the surface substrate.