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Fumigation of stored grain with phosphine works by

  • A.Drying the grain rapidly
  • B.Raising the carbon dioxide concentration
  • C.Releasing a gas that kills insects
  • D.Coating the grain with an insecticide

Answer: C

The gas penetrates the whole bulk and reaches insects in places no contact insecticide could, but it requires a well-sealed structure to hold a lethal concentration. Poor sealing is the commonest cause of failure and of resistance developing.

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