You should buy only fresh products. The longer they sit in the store/storage area, the more chances of bugs there are. Buy in small quantities so that you don’t have to store them for long on a shelf. Things that can be stored in the freezer – like sesame seeds and that type, should be in the freezer. Other products, like rice, barley, etc, have bug-free brands, like Ki-Tov. Quinoa is also available from that brand. It sounds like the ones that you are getting are from perhaps a small store that does not have much of a demand for those products so they have been sitting around. Going to a larger supermarket will hopefully provide you with products that have greater turnover so less bug problems.
