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Studies on carbon dioxide as wheat seed protectant against storage insects and its effect on seed quality stored under ambient conditions

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Modified or controlled atmosphere storage is being considered as one of the alternatives to toxic, residue building chemical fumigants to protect stored seed from insect pest infestations. Lower concentrations of CO2 (5, 10 and 20%) and longer exposure periods (2, 4 and 6 months) were tested against the phosphine tolerant strain of lesser grain borer, Rhyzopertha dominica and rice moth, Corcyra cephalonica. LC50 value of CO2 for the lesser grain borer was found to be 10.28% (v/v) with an exposure period of 48 h. Complete control of the insect population buildup and seed damage was achieved with 20% (v/v) concentration of CO2 within two months of storage period. The 5 and 10% CO2 concentrations also reduced the insect population growth and seed damage as compared to ambient storage.

Storage in CO2-rich atmospheres irrespective of concentrations and periods showed no adverse effect on germinability and vigour of the wheat seed. Similarly, there was no change in the dehydrogenase activity and malondialdehyde content because of CO2 rich atmosphere.
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Document Type: Research Article

Publication date: April 1, 2004

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  • Seed Science and Technology (SST) is one of the leading international journals featuring original papers and review articles on seed quality and physiology as related to seed production, harvest, processing, sampling, storage, distribution and testing. This widely recognised journal is designed to meet the needs of researchers, advisers and all those involved in the improvement and technical control of seed quality.
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