title: Efficacy of Selected Insecticides Applied to Hybrid Rice Seed.
abstract: Hybrid rice and insecticide seed treatments targeting rice water weevil, Lissorhoptrus oryzophilus Kuschel, have altered the landscape of rice production. The effect of reduced seeding rates on seed treatment efficacy in hybrid rice has not been studied. During 2011 and 2012, an experiment was conducted at seven locations to determine the relationship between low seeding rates used in hybrid rice and efficacy of selected insecticidal seed treatments as measured by rice water weevil densities and yield. Labeled rates of thiamethoxam, chlorantraniliprole, and clothianidin were compared with higher rates of these products to determine if labeled rates provide an acceptable level of control of the rice water weevil. Study locations were divided into low, moderate, and high groups based on rice water weevil larval densities. All seed treatments and seed treatment rates reduced rice water weevil densities. However, there was no observed yield or economic benefit from the use of an insecticidal seed treatment in areas of low pressure. Differences in yield were observed among seed treatments and seed treatment rates in moderate and high pressure locations, and all seed treatments yielded better than the untreated plots, but these differences were not always economical. All seed treatments showed an economic advantage in areas of high weevil pressure, and there were no differences among seed treatment products or rates, suggesting that currently labeled seed treatment rates in hybrid rice are effective for rice water weevil management.
authors.affiliation: Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, MS 39762 (caa109@msstate.edu; Fmusser@entomology.msstate.edu; acatchot@entomology.msstate.edu) caa109@msstate.edu.
authors.forename: A
authors.initials: A
authors.lastname: Adams
authors.affiliation: Delta Research and Extension Center (DREC), Mississippi State University, Stoneville, MS 38776 (jgore@drec.msstate.edu; dcook@drec.msstate.edu; Twalker@horizonseed.com; cdobbins@drec.msstate.edu).
authors.forename: J
authors.initials: J
authors.lastname: Gore
authors.affiliation: Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, MS 39762 (caa109@msstate.edu; Fmusser@entomology.msstate.edu; acatchot@entomology.msstate.edu).
authors.forename: F
authors.initials: F
authors.lastname: Musser
authors.affiliation: Delta Research and Extension Center (DREC), Mississippi State University, Stoneville, MS 38776 (jgore@drec.msstate.edu; dcook@drec.msstate.edu; Twalker@horizonseed.com; cdobbins@drec.msstate.edu).
authors.forename: D
authors.initials: D
authors.lastname: Cook
authors.affiliation: Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, MS 39762 (caa109@msstate.edu; Fmusser@entomology.msstate.edu; acatchot@entomology.msstate.edu) caa109@msstate.edu.
authors.forename: A
authors.initials: A
authors.lastname: Catchot
authors.affiliation: Delta Research and Extension Center (DREC), Mississippi State University, Stoneville, MS 38776 (jgore@drec.msstate.edu; dcook@drec.msstate.edu; Twalker@horizonseed.com; cdobbins@drec.msstate.edu).
authors.forename: T
authors.initials: T
authors.lastname: Walker
authors.affiliation: Delta Research and Extension Center (DREC), Mississippi State University, Stoneville, MS 38776 (jgore@drec.msstate.edu; dcook@drec.msstate.edu; Twalker@horizonseed.com; cdobbins@drec.msstate.edu).
authors.forename: C
authors.initials: C
authors.lastname: Dobbins
mesh_terms: D000818:Animals; D004305:Dose-Response Relationship, Drug; D006146:Guanidines; D006824:Hybridization, Genetic; D007300:Insect Control; D007306:Insecticides; D007814:Larva; D008922:Mississippi; D000073943:Neonicotinoids; D009574:Nitro Compounds; D012275:Oryza / Q000235:genetics / Q000502:physiology*; D010078:Oxazines; D012639:Seeds / Q000502:physiology; D000077922:Thiamethoxam; D013844:Thiazoles; D048889:Weevils / Q000254:growth & development; D062367:ortho-Aminobenzoates
chemical_list: D006146:Guanidines; D007306:Insecticides; D000073943:Neonicotinoids; D009574:Nitro Compounds; D010078:Oxazines; D013844:Thiazoles; D062367:ortho-Aminobenzoates; C480342:clothianidin; C517733:chlorantranilipole; D000077922:Thiamethoxam
keywords: Lissorhoptrus oryzophilus; hybrid; insecticide efficacy; seed treatment