Stored grain pest prevalence and insecticide resistance in Egyptian populations of the red flour beetle Tribolium castaneum (Herbst) and the rice weevil Sitophilus oryzae (L.) |
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| Affiliation: | 1. Bioassay Research Department, Central Agricultural Pesticide Laboratory, Sabahia Plant Protection Research Station, Agricultural Research Center, Alexandria, 21616, Egypt;2. Antoniadis Garden, Forestry and Wood Technology Department, Horticulture Research Institute, Agricultural Research Center, Alexandria, Egypt;3. Chemistry and Pesticide Technology Department, Faculty of Agriculture, University of Alexandria, El-Shatby, Alexandria, Egypt;4. Departamento de Entomologia, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, 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 Plant Sciences, Faculty of Agriculture, Rajarata University of Sri Lanka, Puliyankulama, Anuradhapura, Sri Lanka;2. Department of Bioprocess Technology, Faculty of Technology, Rajarata University of Sri Lanka, Mihintale, Sri Lanka;3. USDA, Agricultural Research Service, Center for Grain and Animal Health Research, 1515 College Ave., Manhattan, KS 66052, USA;1. Department of Zoology, University of the Punjab, Quaid-i-Azam Campus, Lahore, Pakistan;2. Faculty of Life Sciences, University of the Central Punjab, Khiyaban-i-Jinnah, Johar Town, Lahore, Pakistan;3. School of Biological Sciences, University of the Punjab, Quaid-i-Azam Campus, Lahore, Pakistan;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 Entomology and Agricultural Zoology, Department of Agriculture Crop Production and Rural Environment, University of Thessaly, Phytokou str., Nea Ionia, 38446, Magnissia, Greece;3. USDA, Agricultural Research Service, Center for Grain and Animal Health Research, 1515 College Avenue, Manhattan, KS, 66502-2736, USA |
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| Abstract: | As a consequence of the widespread use of insecticides against insect pests in grain warehouses and in the food industry, insecticide resistance has greatly increased among these species all over the world. Nonetheless, insecticide resistance in stored grain insects in Egypt was little studied. Therefore, our study aimed to forecast infestation risks and determine the insecticide resistance level in Egyptian populations of the main insect pests of stored grains. To achieve this goal, we surveyed the populations of stored-product insects in wheat in two different sites in the Alexandria governorate (Egypt) between June and August 2017. Moreover, insecticide resistance levels in Egyptian populations of Tribolium castaneum (Herbst) and Sitophilus oryzae (L.) collected from wheat storage facilities (granaries and flour mills) in Alexandria governorate were also determined. Three contact insecticides, namely malathion, pirimiphos-methyl and cypermethrin, were tested. Tarsal contact bioassays on filter paper were carried out on adults following FAO methods and concentration-mortality lines were estimated to determine the resistance ratios for each insecticide and population. The data from the monitoring of insects revealed that T. castaneum and S. oryzae were the most common species infesting wheat in both Alexandria granaries and mills. Populations of S. oryzae were generally more resistant to malathion than the populations of T. castaneum. However, T. castaneum populations were more resistant to pirimiphos-methyl than the S. oryzae populations. Both populations of T. castaneum and S. oryzae were susceptible to cypermethrin. The detected levels of insecticide resistance indicate that this phenomenon takes place and should be a concern in Egyptian populations of T. castaneum and S. oryzae requiring monitoring and design of resistance management practices. |
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| Keywords: | Stored products Resistance Pirimiphos-methyl Malathion Cypermethrin |
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