Insecticidal efficacy of a binary combination of cyphenothrin and prallethrin,applied as surface treatment against four major stored-product insects |
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| Affiliation: | 1. The New Zealand Institute for Plant & Food Research Limited, Private Bag 11600, Palmerston North, 4442, New Zealand;2. Apreso, PO Box 2407, Palmerston North, New Zealand;3. Start Afresh, PO Box 4606, Mt Maunganui, New Zealand;4. Mae Fah Luang University, 333 Moo. 1, Tasud, Muang, Chiang Rai, 57100, Thailand;1. Laboratory of Agricultural Zoology and Entomology, Department of Crop Science, Agricultural University of Athens, 75 Iera Odos str., 11855, Athens, Attica, Greece;2. Laboratory of Agricultural Entomology, Department of Entomology and Agricultural Zoology, Benaki Phytopathological Institute, 8 Stefanou Delta str., 14561, Kifissia, Attica, Greece;3. Laboratory of Entomology and Agricultural Zoology, Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Phytokou str., Nea Ionia, 38446, Magnissia, Greece;4. Research and Consulting Inc., 14 Tidefall Dr., Toronto, ON, M1W 1J2, Canada;5. Department of Agricultural Technology, Technological Educational Institute of Peloponnese, 24100, Antikalamos, Kalamata, Greece;1. Department of Entomology, Purdue University, 901 State Street, West Lafayette, IN, 47907, USA;2. Department of Agricultural and Biological Engineering, Purdue University, 225 South University Street, West Lafayette, IN, 47907, USA;1. Department of Biological Sciences, Faculty of Science, University of Zimbabwe, P.O Box MP167, Mt Pleasant, Harare, Zimbabwe;2. Department of Soil Science and Agricultural Engineering, Faculty of Agriculture, University of Zimbabwe, P.O Box MP167, Mt Pleasant, Harare, Zimbabwe;3. Department of Crop Science, Faculty of Agriculture, University of Zimbabwe, P.O Box MP167, Mt Pleasant, Harare, Zimbabwe;4. Department of Research and Specialist Services, Plant Protection Research Institute, P. O Box CY 550, Causeway, Harare, Zimbabwe |
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| Abstract: | In the present study, we investigated the insecticidal efficacy of a commercial binary combination of two pyrethroids, cyphenothrin and prallethrin, as structural treatment against adults of Sitophilus oryzae (L.), Oryzaephilus surinamensis (L.), Tribolium confusum Jacquelin du Val and Prostephanus truncatus (Horn) in laboratory bioassays. In a first series of bioassays, the insecticide was applied at its label dose on concrete and metal surfaces, whereas mortality and knockdown levels were recorded after 1, 3, 7 and 14 d of exposure. In a second series of bioassays, the residual efficacy of the insecticide was evaluated on concrete for a period of four months, stored either in continuous darkness or exposed to light. In these bioassays, mortality and knockdown of the exposed insects was measured after 3, 7 and 14 d of exposure. Finally, in a third series of bioassays, we investigated the immediate and delayed effect of the tested formulation on adults of the four insect species after exposure for 1, 3 and 7 d. Based on our results, the application of the tested insecticide as surface treatment can provide efficient control against adults of all four species tested. The surface type did not significantly affect the insecticidal efficacy of the tested formulation, at least for the surfaces tested. Moreover, exposure to light negatively affected the residual activity of the insecticide, as for all insect species tested, mortality was significantly lower on dishes exposed to light than on the ones stored in the dark for storage intervals equal or longer than two months. Finally, reduced delayed mortality was observed for all exposure intervals, as knocked down individuals remained, in most cases, knocked down even 7 d after their removal from the treated dishes. |
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| Keywords: | Cyphenothrin Prallethrin Residual efficacy Stored-product insects Surface treatment |
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