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Efficacy of layer grain treatment with thiamethoxam against adults of Rhyzopertha dominica (F.) and Sitophilus oryzae (L.)
Affiliation:1. Newcastle upon Tyne, UK;2. School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE17RU, UK;1. Campus Serra Talhada, Instituto Federal do Sertão Pernambucano, Serra Talhada, PE, Brazil;2. Unidade Acadêmica de Serra Talhada, Universidade Federal Rural de Pernambuco, Serra Talhada, PE, Brazil;1. Laboratory of Entomology and Agricultural Zoology, Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Phytokou Str., 38446, Volos, Magnesia, Greece;2. Agrospecom, N. Kountourioti 3, Thessaloniki, 54625, Greece;3. Centaur Analytics, Inc., 1923 Eastman Ave, Ste 200, Ventura, 93003, CA, USA;1. Department of Food Chemistry, Research Institute of Food Science and Technology, Mashhad, Iran;2. Department of Food Processing, Research Institute of Food Science and Technology, Mashhad, Iran;3. School of Continuing Study, McGill University, Montreal, Québec, Canada
Abstract:The insecticidal effect of the neonicotinoid insecticide thiamethoxam, applied in layers of wheat, was studied in laboratory experiments, for the control of the lesser grain borer, Rhyzopertha dominica (F.) and the rice weevil Sitophilus oryzae (L.). In general, the increase of the size of the treated layer of wheat increased parental morality and decreased progeny production for both species. However, progeny production could not be totally avoided, even when the entire grain quantity was treated. Parental morality was lower for R. dominica than for S. oryzae, but the reverse was observed for progeny production for all treatments. Insect placement drastically affected thiamethoxam efficacy, since morality was generally higher when insects were forced to move downwards from the upper layer, as compared with insects that had been placed in the bottom part of the wheat column. Our study shows that thiamethoxam can reduce insect populations in partially treated wheat, at concentrations that are comparable with other, currently registered grain protectants.
Keywords:Rhyzopertha dominica  Sitophilus oryzae  Thiamethoxam  Partial grain treatment  Efficacy  Progeny production  Grain protectants
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