Susceptibility of selected maize seed genotypes to Sitophilus zeamais (Coleoptera: Curculionidae) |
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| Affiliation: | 1. West Africa Centre for Crop Improvement, College of Basic and Applied Sciences, PMB 30, University of Ghana, Legon, Accra, Ghana;2. Department of Crop Science, College of Basic and Applied Sciences, P. O. Box LG 44, University of Ghana, Legon, Accra, Ghana;1. Department of Sustainable Agriculture and Biodiversity Ecosystem Management, School of Life Sciences and Bioengineering, The Nelson Mandela African Institution of Science and Technology (NM –AIST), P.O. Box 447, Arusha, Tanzania;2. Centre for Research, Agriculture Advancement, Teaching Excellence and Sustainability in Food and Nutrition Security (CREATES), Nelson Mandela African Institution of Science and Technology, P.O. Box 447, Arusha, Tanzania;3. Tanzania Agricultural Research Institute (TARI –Ilonga), P.O.Box 33, Kilosa, Tanzania;1. Department of Biological Sciences, Arkansas State University, Jonesboro, AR, 72467, United States;2. Arkansas Agricultural Experiment Station, Arkansas State University Research Unit, Jonesboro, AR, 72467, United States;3. Department of Food Science, University of Arkansas & Division of Agriculture, Fayetteville, AR, 72704, United States;1. Laboratory of Entomology and Agricultural Zoology, Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Phytokou Str., Volos, 38446, Greece;2. BASF Crop Protection, BASF Plant Science, Speyerer Straße 2, D-67117, Limburgerhof, Germany;3. BASF Hellas, Paradissou 2 and Kifissias, 151 25, Maroussi, Athens, Greece;4. BASF Corporation, 26 Davis Drive, Research Triangle Park, 27709-3528, NC, USA;1. Leibniz Institute for Agricultural Engineering and Bioeconomy (ATB), Max-Eyth-Allee 100, 14469, Potsdam, Germany;2. Food Process Engineering, Technische Universität Berlin, Seestraße 13, 13353, Berlin, Germany;1. Laboratory of Entomology and Agricultural Zoology, Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Phytokou str., Nea Ionia, Magnesia, 38446, Greece;2. Department of Grain Science and Industry, Kansas State University, Shellenberger Hall 306, 66506, Manhattan, KS, USA;1. International Maize and Wheat Improvement Center (CIMMYT), P.O. Box 1041-00621, Nairobi, Kenya;2. Gent University College, Gent, Belgium |
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| Abstract: | Studies were carried out under laboratory conditions of 25 ± 2 °C and 70 ± 5% RH in an incubator to determine the relative susceptibility of eighteen maize genotypes to attack by the maize weevil, Sitophilus zeamais Motschulsky. The experiment was laid out in a Completely Randomized Design (CRD) with three replications. Adult mortality, number of F1 progeny, weevil development time, susceptibility index, percentage seed damage, percentage weight loss, and weight of powder produced were determined after storage period of three months. The susceptibility index was determined using Dobie’s formula and the genotypes were classified into different susceptibility groups. The genotypes exhibited varying degrees of susceptibility to S. zeamais attack. Only Aseda was regarded as resistant and TZE-Y POP STR as moderately resistant to S. zeamais. Kpari-Faako, Tintim, WACCI-M-1215, WACCI-M-1594 and Wang-Dataa were regarded as moderately susceptible to S. zeamais. However, Abontem, Bihilifa, Ewul-Boyu, Sanzal-Sima, TZE-I 17, WACCI-M-1205, WACCI-M-1508 and WACCI-M-1510 were regarded as susceptible genotypes. Furthermore, Aburohemaa, Obaatanpa and Omankwa were regarded as highly susceptible to S. zeamais. Number of F1 progeny, seed damage, seed weight loss, weight of dust produced and seed moisture content had positive relationship with varietal susceptibility while adult weevil mortality, median development period and seed germination after infestation had an inverse relationship with susceptibility in maize. The use of insect resistant genotypes would offer a sustainable way of minimizing postharvest losses of seeds in storage especially for smallholder farmers who keep harvested grains for future use as food and seed. |
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| Keywords: | Maize weevil Susceptibility index Postharvest losses |
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