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Carbon dioxide concentrations associated with insect infestations of stored grain 1. natural infestation of corn barley and wheat in farm granaries



Carbon dioxide concentrations associated with insect infestations of stored grain 1. natural infestation of corn barley and wheat in farm granaries



Sciences des Aliments 6(1): 91-98



Concentrations of carbon dioxide in the intergranular air of infested grain in naturally infested and noninfested farm granaries were measured to develop a method to detect insect infestations and spoilage of stored grain. Intergranular CO2 concentrations of 2% or higher were recorded in nine-non-airtight steel farm bins containing insect-infected corn, barley, or wheat in Manitoba, Canada and Minnesota, USA, during 1981-82. Three similar but noninfested bins had normal, ambient levels of intergranular CO2, ca. 0.03%. The predominant insects infesting the nine binds were: Plodia interpunctella (Hubner), Cryptolestes ferrugineus (Stephens), C. pusillus (Schonherr), and Tribolium castaneum (Herbst). Information on microflora, mites, seed germination, and free fatty acids associated with grain samples indicated that the crops were in various stages of deterioration in the pest infested bins, and that this deterioration was detected by CO2 monitoring.

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