Respiratory Environments of Grain-Infesting Weevils. I. Comparison of Culture-Jar and Laboratory Rearing-Room Atmospheres1

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Respiratory atmospheres in laboratory culture jars were analyzed with a Fisher-Hamilton Gas Partitioner with a dual column-dual detector system. Larger rice weevils, Sitophilus zeamais Motschulsky, were reared in open-top mason jars in which CO2, was retained and in specially de-signed plastic jars open at both ends so as to allow dissipation of CO2 CO2 gradually built up, while O2 was gradually deplcted during larval development. Greatest CO2 accumulation occurred in the bottom of the mason rearing jars and in the middle of the plastic jars. Laboratory atmospheres contained less CO2 and more O2 than rearing room atmospheres and each had much less CO2 and more O2 than the culture jars. CO2 buildup was greatly increased at each 5% level when weevil infestations were increased between 5 and 20%.

Document Type: Research Article

Publication date: April 1, 1968

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