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Carbon dioxide concentrations associated with insect infestations of stored grain 3. infestation in bagged wheat



Carbon dioxide concentrations associated with insect infestations of stored grain 3. infestation in bagged wheat



Sciences des Aliments 6(1): 107-118



Concentrations of carbon dioxide in the intergranular air of infested grain in commercially used bags were measured to develop a method to detect insect infestations in bag-stored wheat. Regression equations based on stepwise multiple regression analyses of laboratory data on levels of CO2 produced by Tribolium castaneum (Herbst) caged in bags containing wheat revealed significant relationships between CO2 production and individual life stages of the insect. The CO2 production by Cryptolestes ferrugineus (Stephens) was similar to that produced by uninfested control bags. Carbon dioxide yield was most strongly correlated with the adult and early larval stages of T. castaneum. Detection of low levels of insect infestation through CO2 measurement will be useful because it may signal a need to aerate or chemically treat the grain before heavy spoilage occurs. The results also provide baseline data for developing prediction models that may allow for the determination of the levels of hidden infestations and incipient grain spoilage in wheat stored in bags.

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