Grain beetles usually come from infested food that you unknowingly bought at a grocery store. Since they are usually are brought in on infested packaged food, only when you open will you know of the infestation. If you do purchase something infested with beetles, report it to wherever you bought it and avoid that brand going forward. Keep dried foods in sealed, air-tight containers which will help the infestation from growing.
If grain beetles have found their way into your pantry, then the first step is to throw away any infested food and do a thorough cleaning. Dispose of any food that may have been contaminated. Then take all the remaining uncontaminated items out of your cabinets or pantry so you can deep clean the shelves. If you have shelf liner, throw it away and clean where it was. Don’t forget to vacuum the cracks behind your molding. It only takes a few grains of food to attract a population of warehouse beetles. Once everything is clean and you’re ready to restock, store food in tightly sealed containers made of glass or hard plastic. Note the brand of food you purchased that was infested and let your local grocery store know. And of course avoid that brand in the future..
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