Efficacy of grain protectants against four psocid species on maize, rice and wheat

• Published in: Pest management science 2009-10, Vol.65 (10), p.1140-1146
• Main Authors: Athanassiou, Christos G, Arthur, Frank H, Throne, James E
• Format: Article
• Language: English
• Subjects: Animals; Biological and medical sciences; chlorpyrifos-methyl; Control; Corn; Data processing; Deltamethrin; emerging pests; fecundity; Female; females; Food Preservation; Fumigants; Fundamental and applied biological sciences. Psychology; Grain; insect control; Insecta - drug effects; insecticide resistance; Insecticides; Insecticides - pharmacology; Insects; Invertebrates; Lepinotus reticulatus; Liposcelis; Liposcelis bostrychophila; Liposcelis entomophila; Liposcelis paeta; maize; Male; Medically important nuisances and vectors, pests of stored products and materials: population survey and control; Mortality; Oryza - parasitology; Oryza sativa; Pest control; Pests; Pests of stored products; Phytopathology. Animal pests. Plant and forest protection; pirimiphos-methyl; Plant reproduction; Progeny; Protozoa. Invertebrates; Psocidae; pyrethrins; Rice; Spinosad; storage insects; Stored products; Studies; temporal variation; Triticum - parasitology; Triticum aestivum; Wheat; Zea mays; Zea mays - parasitology
• ISSN: 1526-498X; 1526-4998; 1526-4998
• DOI: 10.1002/ps.1804

BACKGROUND: Psocids are emerging pests in stored products, particularly in amylaceous commodities such as grains. Currently, their control is based on the use of fumigants and contact insecticides; however, newer data indicate that psocids are tolerant to insecticides used to control other stored-grain species. This study evaluated the insecticides registered in the USA for use on stored maize, rice and wheat for control of the psocid species Lepinotus reticulatus, Liposcelis entomophila, L. bostrychophila and L. paeta. Mortality of exposed adult females was recorded after 7 and 14 days of exposure, while progeny production was assessed after 30 days of exposure.RESULTS: On wheat and rice, chlorpyriphos-methyl + deltamethrin was generally more effective against exposed parental adults than spinosad or pyrethrin, while pirimiphos-methyl was more effective on maize than spinosad or pyrethrin. In most cases, progeny production was suppressed in the treated grains. Progeny production was consistently lowest on wheat and rice treated with chlorpyriphos-methyl + deltamethrin and maize treated with pirimiphos-methyl.CONCLUSIONS: Chlorpyriphos-methyl + deltamethrin and pirimiphos-methyl were the most effective insecticides for all species and commodities. Conversely, efficacy of spinosad or pyrethrum was highly dependent on the psocid species and commodity.