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1 June 2015 Efficacy of Deltamethrin Against Stored-Product Beetles at Short Exposure Intervals or on a Partially Treated Rice Mass
Nickolas G. Kavallieratos, Christos G. Athanassiou, Frank H. Arthur
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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.

Published by Oxford University Press on behalf of Entomological Society of America 2015. This work is written by US Government employees and is in the public domain in the US.
Nickolas G. Kavallieratos, Christos G. Athanassiou, and Frank H. Arthur "Efficacy of Deltamethrin Against Stored-Product Beetles at Short Exposure Intervals or on a Partially Treated Rice Mass," Journal of Economic Entomology 108(3), 1416-1421, (1 June 2015).
Received: 26 October 2014; Accepted: 25 February 2015; Published: 1 June 2015

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partially treated rice
short exposure
stored-product beetles
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