An oil lamp is lit and kept inside the barn and the barn is made air tight. The burning lamp slowly consumes all the oxygen in the barn, making the insects difficult to survive. The grain is stored in this way without being affected by insects.
Ingredients: barn, lamp
“Indigenous grain structures and methods of storage”
http://nopr.niscair.res.in/handle/123456789/6811
“Farmers use traditional storage containers for storing food grains for their own need.”
https://www.sciencedirect.com/science/article/pii/S0570178319300375
“Dodi leaves for grain storage”
https://honeybee.org/honeybee_detailed.php?ID=9315&page=6&search_case=grain%20storage
“ Dried leaves of neem and dried pepper stallk (after extracting pepper) are mixed with rice and other grains to repel storage pests”
https://honeybee.org/honeybee_detailed.php?ID=5755&page=2&search_case=grain%20storage