Use Neem tree leaves to avoid those insects in your stored rice. Just put it inside the rice container. It will not work if there are insects already in the rice. You have to put the leaves as soon as you remove it from the plastic bag and transfer to the container. Or if your container already has insects, you need to clean the rice and remove the insects and then put back into the container and add the leaves. 1 stem is good for around 25 kilos of rice.
It does not however work for japanese or calrose rice as it gives it a smell. So use it only for jasmine or local rice.
Neem trees are quite common in our country, so chances are you can find them easily.