title: Efficacy of Methyl Bromide for Control of Different Life Stages of Stored-Product Psocids.
abstract: The psocid species Liposcelis paeta Pearman, Liposcelis entomophila (Enderlein), Liposcelis decolor (Pearman), Liposcelis bostrychophila Badonnel (Psocoptera: Liposcelididae), and Lepinotus reticulatus Enderlein (Psocoptera: Trogiidae) were evaluated in laboratory bioassays to determine their susceptibility to six concentrations of methyl bromide (0.027, 0.113, 0.280, 0.393, 0.452, and 0.616 g/m3) after 48 h of exposure at 27.5°C. The life stages that were evaluated were adults (for all species), nymphs (for all species except Lep. reticulatus), and eggs (for L. entomophila, L. decolor, and L. bostrychophila). Adults and nymphs were very susceptible, and complete mortality was recorded at concentrations between 0.027 and 0.280 g/m3. In contrast, eggs were by far more tolerant than adults and nymphs for all species tested. At 0.027 g/m3, mortality did not exceed 53%, while survival was high even at 0.113 g/m3. Complete (100%) egg mortality was recorded at 0.393 g/m3 for L. decolor and at 0.452 g/m3 for L. entomophila and L. bostrychophila; concentrations estimated to give 99% mortality for eggs of these three species were 0.710, 1.044, and 0.891 g/m3, respectively. These results show that stored-product psocids are susceptible to methyl bromide, but concentrations of ≥0.452 g/m3 should be used to control all life stages.
authors.affiliation: Laboratory of Entomology and Agricultural Zoology, Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Phytokou str., 38446, N. Ionia Magnesia, Greece. USDA, Agricultural Research Service, Center for Grain and Animal Health Research, 1515 College Avenue, Manhattan KS 66502-2736, USA. athanassiou@agr.uth.gr.
authors.forename: Christos G
authors.initials: CG
authors.lastname: Athanassiou
authors.affiliation: Department of Entomology, 123 W. Waters Hall, Kansas State University, Manhattan, KS 66506-4004, USA. Laboratory of Post-harvest Entomology, Department of Zoology, Rajshahi University, Rajshahi 6205, Bangladesh.
authors.forename: M Mahbub
authors.initials: MM
authors.lastname: Hasan
authors.affiliation: Department of Entomology, 123 W. Waters Hall, Kansas State University, Manhattan, KS 66506-4004, USA.
authors.forename: Thomas W
authors.initials: TW
authors.lastname: Phillips
authors.affiliation: Department of Entomology, 123 W. Waters Hall, Kansas State University, Manhattan, KS 66506-4004, USA.
authors.forename: M Jamie
authors.initials: MJ
authors.lastname: Aikins
authors.affiliation: USDA, Agricultural Research Service, Center for Grain and Animal Health Research, 1515 College Avenue, Manhattan KS 66502-2736, USA. Current address: USDA, Agricultural Research Service, Jan San Joaquin Valley Agricultural Sciences Center, 9611 S. Riverbend Ave., Parlier CA 93648, USA.
authors.forename: James E
authors.initials: JE
authors.lastname: Throne
mesh_terms: D000818:Animals; D004305:Dose-Response Relationship, Drug; D005506:Food Contamination / Q000517:prevention & control; D005651:Fumigation; D006842:Hydrocarbons, Brominated; D007300:Insect Control; D007313:Insecta / Q000254:growth & development; D007305:Insecticide Resistance; D007306:Insecticides; D009758:Nymph / Q000254:growth & development; D010063:Ovum / Q000254:growth & development
chemical_list: D006842:Hydrocarbons, Brominated; D007306:Insecticides; C005218:methyl bromide
keywords: Lepinotus; Liposcelis; Psocoptera; fumigant; methyl bromide