The cheapest grain storage technique PICS bag consists of two layers of polyethene liners and a third layer made from woven polypropylene. When each layer is tied and closed separately, it creates a hermetically sealed environment for storing harvested grain. This oxygen-deprived environment proves fatal for postharvest insects.

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The cheapest grain storage technique PICS bag consists of two layers of polyethene liners and a third layer made from woven polypropylene.