Efficacy of dinotefuran (Alpine® spray and dust) on six species of stored product insects

Dinotefuran, an agonist of insect nicotinic acetylcholine receptors, was evaluated both as a 0.5% active ingredient aerosol spray and a dust combined with diatomaceous earth (DE), 5 g/m(2) and 10 g/m(2), at 45% r.h. and 75% r.h. Target species were six adult stored product insect species: Tribolium castaneum (Herbst), Rhyzopertha dominica (F.), Oryzaephilus surinamensis (L). Tribolium confusum Jacqueline du Val, Dermestes maculatus (DeGeer), and Mezium affine Boieldieu. Adults were continually exposed for 4 d on the dusts, and assessments were done after 8 h and after 1, 2, 3, and 4 d to determine knockdown and adult survival/mortality. Mortality of T. castaneum, R. dominica, and O. surinamensis generally increased with exposure interval, and was 90% or more after three days of exposure at both dust rates and r.h. levels. Mortality of D. maculatus and T. confusum after three days ranged between 60 and 70% and 50 and 60%, respectively. Mortality of M. affine was 5% or less even after 4 days of exposure. Mortality of all species except M. affine was generally lower when exposed to the spray rather than the dust. No late stage larvae of T castaneum, T. confusum, O. surinamensis, exposed to either the spray or the dusts emerged as adults, and only 3% of exposed D. maculatus emerged as adults. Results show that dinotefuran could be incorporated into management plans for control of stored product insects. Published by Elsevier Ltd.