Discussion
Which one of the following chemicals is NOT used for fumigation in either horizontal or vertical storage structures to kill insects?
Answer: D
The chemical NOT used as a fumigant is silver sulphate.
A fumigant must be a gas, or release one, that penetrates bulk grain and kills insects. Methyl bromide is such a gas, and aluminium phosphide formulations, sold as Phostoxin, release phosphine gas on contact with moisture.
Silver sulphate is a stable solid salt that releases no toxic vapour, so it has no role in fumigating storage structures.
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