Laboratory experiments of vacuum treatment in combination with an O2 absorber for the suppression of Sitophilus granarius infestations in stored grain samples |
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| Institution: | 1. Department of Pest Control of Stored Products and Food Safety, Division of Plant Health, Crop Research Institute, Prague, Czech Republic;2. Food Research Institute Prague, Prague, Czech Republic;1. Programa de Pós-Graduação em Tecnologia de Alimentos (PPGTA), Universidade Tecnológica Federal do Paraná, Campus Campo Mourão (UTFPR-CM), via Rosalina Maria Dos Santos, 1233, Caixa Postal: 271, CEP 87301-899 Campo Mourão, Paraná, Brazil;2. Departamento Acadêmico de Alimentos (DALIM), Universidade Tecnológica Federal do Paraná, Campus Campo Mourão (UTFPR-CM), via Rosalina Maria Dos Santos, 1233, Caixa Postal: 271, CEP 87301-899 Campo Mourão, Paraná, Brazil;3. Departamento de Engenharia Química e Engenharia de Alimentos, Centro Tecnológico–CTC, Campus Reitor João David Ferreira Lima, Caixa Postal 476, CEP: 88040-970 Florianópolis, Santa Catarina, Brazil;1. Department of Economics, University of Zimbabwe, P. O. Box MP 167 Mt Pleasant, Harare, Zimbabwe;2. Department of Agricultural Economics and Extension, Faculty of Agriculture, University of Zimbabwe, P. O. Box MP 167 Mt Pleasant, Harare, Zimbabwe;3. Department of Soil Science and Agricultural Engineering, Faculty of Agriculture, University of Zimbabwe, P. O. Box MP 167 Mt Pleasant, Harare, Zimbabwe;1. UTP University of Science and Technology, Department of Entomology and Molecular Phytopathology, 85-225 Bydgoszcz, 20 Kordeckiego St., Poland;2. UTP University of Science and Technology, Department of Plant Growth Principles and Experimental Methodology, 85-225 Bydgoszcz, 20 Kordeckiego St., Poland;1. School of Biology and Ecology, University of Maine, 5722 Deering Hall, Orono, ME 04469-5722, USA;2. Maine Board of Pesticides Control, 28 State House Station, Augusta, ME 04333-0028, USA |
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| Abstract: | The effectiveness of vacuum (V) treatment alone and in combination with an oxygen absorber (V + A) for suppression of grain infestation by Sitophilus granarius L. were compared under laboratory conditions. The effectiveness of the treatment methods was evaluated at different temperatures (15, 25 °C) and exposure times (7, 14, 21, 28 days). We evaluated both the effects on adults present in grain interspaces and hidden infestations within the kernels in terms of treatment time separately. Adults of S. granarius present in grain interspaces were more susceptible to both treatments than hidden infestations developing within kernels. At 25 °C, total mortality of adults in grain interspaces was achieved after 10 days of exposure whereas total suppression of hidden infestations was achieved after 3 weeks. Higher temperature and longer exposure correlated with a greater effectiveness of the tested treatments. The addition of an oxygen absorber to the vacuum treatment (V + A) showed the general tendency of improving the effectiveness of the vacuum treatment on suppression of hidden infestations; significant differences between the V + A and V treatments were prominent primarily at the lower temperature tested. Reduction of hidden infestation was achieved after 3 weeks of exposure to V + A treatment (99.8%) and after 4 weeks of V treatment (95.8%) at 15 °C. |
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| Keywords: | Hidden infestation Stored grain Vacuum Chemical oxygen absorber Temperature |
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