they can be a problem if you try to store feed for extended periods like buying multiple bags at a time .. they can ruin quite a bit of the bag, and once theyre in your garage or wherever you keep the feed they can infest any clean bags you put in there ... so .. theyre mostly a problem in the warmer months .. clean the storage area often and put down some kind of pesticide is my advice to at least control them .. a good strategy if its available to you is to freeze any new bags in a chest freezer if your weevil free so you dont reintroduce them .. they can get in your house to and if you store dry food can ruin that, like pasta, rice etc, and they can get into most bags .. so yeah .. i wouldnt just ignore them in the warmer months anyway ..