title: Baseline toxicity and field efficacy of metaflumizone on Colorado potato beetle (Coleoptera: Chrysomelidae).
abstract: Baseline toxicity levels to a novel semicarbazone insecticide, metaflumizone were established for 25 field populations of Colorado potato beetle, Leptinotarsa decemlineata Say (Coleoptera: Chrysomelidae),from North America. Excluding the susceptible laboratory strain, 50% lethal concentrations of metaflumizone ranged from 0.57 to 1.31 ppm, while response slopes ranged from 1.92 to 4.24 (average = 2.93), and were unrelated to the 50% lethal concentration (r = 0.06; P = 0.76). Beetle populations with known resistance to the neonicotinoid imidacloprid also exhibited the highest LC50 levels to metaflumizone suggesting at least the possibility of cross-resistance. Additional experiments using a potato leaf-dip bioassay as well as field efficacy evaluations confirmed the high level of toxicity of metaflumizone to L. decemlineata and demonstrated a potential benefit of tank mixing a low rate of the pyrethroid esfenvalerate with metaflumizone at one-tenth the recommended field rate. These research findings confirm that metaflumizone is highly active against L. decemlineata larvae and adults and could provide an effective alternative insecticide for potato pest management.
authors.affiliation: Department of Entomology, Virginia Tech, 216 Price Hall, Blacksburg, VA 24061-0319, USA.
authors.forename: Erin M
authors.initials: EM
authors.lastname: Hitchner
authors.forename: Thomas P
authors.initials: TP
authors.lastname: Kuhar
authors.forename: Galen P
authors.initials: GP
authors.lastname: Dively
authors.forename: Roger R
authors.initials: RR
authors.lastname: Youngman
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Philips
authors.forename: Troy D
authors.initials: TD
authors.lastname: Anderson
mesh_terms: D000818:Animals; D001681:Biological Assay; D002170:Canada; D001517:Coleoptera / Q000187:drug effects* / Q000235:genetics; D004305:Dose-Response Relationship, Drug; D007300:Insect Control / Q000379:methods*; D007305:Insecticide Resistance; D007306:Insecticides / Q000494:pharmacology*; D007814:Larva / Q000187:drug effects / Q000235:genetics; D009570:Nitriles / Q000494:pharmacology; D011722:Pyrethrins / Q000494:pharmacology; D012664:Semicarbazones / Q000494:pharmacology*; D014481:United States
chemical_list: D007306:Insecticides; D009570:Nitriles; D011722:Pyrethrins; D012664:Semicarbazones; C528570:metaflumizone; C017690:fenvalerate