Discussion
The best method for controlling stored grain pests is through :
Answer: A
The best method is fumigation.
Stored grain pests such as weevils, beetles and moths live and breed inside the grain mass and even inside individual kernels. A fumigant is a gas, such as phosphine released from aluminium phosphide tablets, that penetrates the whole stack in a sealed store and kills every stage of the insects, including eggs and larvae hidden in the grain, without leaving significant residues once aired.
Systemic insecticides act through a living plant's sap and are useless in harvested grain. Heating enough to kill the insects can damage germination and quality. Biological agents are slow and cannot clear an infestation already inside the grain.
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