title: Efficacy of Deltamethrin Against Stored-Product Beetles at Short Exposure Intervals or on a Partially Treated Rice Mass.
abstract: Stored-product insects can potentially be exposed to grain protectants for variable time periods. Adults of three species, the lesser grain borer, Rhyzopertha dominica (F.) (Coleoptera: Bostrychidae), the granary weevil Sitophilus granarius (L.) (Coleoptera: Curculionidae), and the red flour beetle, Tribolium castaneum (Herbst) (Coleoptera: Tenebrionidae) were exposed for 1, 4, 8, and 24 h on brown rice treated with the pyrethroid deltamethrin at the label rate of 0.5 ppm, then removed and placed on untreated rice. Adults of these same species plus the rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae), the maize weevil, Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae), and the warehouse beetle, Trogoderma variabile Ballion (Coleoptera: Dermestidae) were exposed on treated brown rice mixed with varying amounts of untreated rice to assess progeny production. Immediate and delayed mortality of exposed adults did not exceed 7% for any exposure interval, but progeny production for T. castaneum was generally lower in comparison with that for the other species. Increasing the amount of treated rice decreased progeny production of R. dominica but not for any Sitophilus species. Mixed results were obtained for T. castaneum and T. variabile. Results show that long exposure times and treatment of an entire rice mass may be necessary to give complete control of stored-product beetles.
authors.affiliation: Laboratory of Agricultural Zoology and Entomology, Department of Crop Science, Agricultural University of Athens, 75 Iera Odos str., 11855, Athens, Attica, Greece. Laboratory of Agricultural Entomology, Department of Entomology and Agricultural Zoology, Benaki Phytopathological Institute, 8 Stefanou Delta str., 14561, Kifissia, Attica. USDA, Agricultural Research Service, Center for Grain and Animal Health Research, 1515 College Avenue, Manhattan KS 66502-2736, USA. nick_kaval@hotmail.com.
authors.forename: Nickolas G
authors.initials: NG
authors.lastname: Kavallieratos
authors.affiliation: USDA, Agricultural Research Service, Center for Grain and Animal Health Research, 1515 College Avenue, Manhattan KS 66502-2736, USA. Laboratory of Entomology and Agricultural Zoology, Department of Agriculture Crop Production and Rural Development, University of Thessaly, Phytokou str., 38446, Nea Ionia, Magnissia, Greece.
authors.forename: Christos G
authors.initials: CG
authors.lastname: Athanassiou
authors.affiliation: USDA, Agricultural Research Service, Center for Grain and Animal Health Research, 1515 College Avenue, Manhattan KS 66502-2736, USA.
authors.forename: Frank H
authors.initials: FH
authors.lastname: Arthur
mesh_terms: D000818:Animals; D001517:Coleoptera; D005260:Female; D005506:Food Contamination / Q000517:prevention & control*; D007300:Insect Control; D007306:Insecticides; D008297:Male; D009570:Nitriles; D012275:Oryza; D011722:Pyrethrins; D014231:Tribolium; D048889:Weevils
chemical_list: D007306:Insecticides; D009570:Nitriles; D011722:Pyrethrins; C017180:decamethrin
keywords: deltamethrin; partially treated rice; short exposure; stored-product beetles