Efficacy of spinosad in layer-treated wheat against five stored-product insect species

• Published in: Journal of stored products research 2009-10, Vol.45 (4), p.236-240
• Main Authors: Athanassiou, C.G., Arthur, F.H., Throne, J.E.
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; application methods; application rate; Beetles; Biological and medical sciences; depth; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Grain protectants; Harvesting. Postharvest. Storage; insect control; Invertebrates; layer application; Medically important nuisances and vectors, pests of stored products and materials: population survey and control; mortality; Pests of stored products; Psocids; Rhyzopertha dominica; Sitophilus oryzae; spinosad; storage insects; stored product protection; surface treatment; Surface treatments; treatment depth; Triticum aestivum; Vegetative propagation. Sowing and planting. Harvesting; wheat
• ISSN: 0022-474X; 1879-1212
• DOI: 10.1016/j.jspr.2009.04.002

The biological insecticide spinosad was evaluated in laboratory bioassays as a surface treatment for wheat to control adult Rhyzopertha dominica, Sitophilus oryzae and three psocid species, Liposcelis paeta, L. bostrychophila, and Lepinotus reticulatus. Spinosad was applied at 1 ppm to 35 g of wheat placed in a vial or to the upper one half, one fourth, or one eighth layer of the wheat; insects were either added to the vials before or after the wheat. When R. dominica were introduced into the vials after the wheat, mortality was 100% except for 83% mortality in the one eighth layer treatment. In contrast, when adults were placed in the vials before the wheat, mortality was 100% only when all of the wheat was treated. Mortality of S. oryzae was lower compared to R. dominica but there was some evidence of upward movement into the treated layers. Mortality of L. paeta and L. bostrychophila was