Discussion
Controlled atmosphere storage of grain suppresses insects by
Answer: D
Correct answer: Raising carbon dioxide
Controlled atmosphere storage suppresses insects by altering the gas composition - raising the carbon dioxide concentration, lowering the oxygen, or both. Insects at every life stage depend on aerobic respiration, so an atmosphere of high carbon dioxide or below about 2 per cent oxygen kills them over days to weeks with no chemical residue.
The method requires a well-sealed structure to hold the atmosphere. It does not depend on temperature or on drying the air, and it uses no insecticide, which is precisely its attraction where residues or resistance are a concern.
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