I bought the wife a breadmaker a few years back and it gets occasional use. Since the use of said machine is occasional, it means that we often have f lour stored in the cupboard for months.
A regular problem with our stored flour is the appearance of weevils. It se ems that any quantity of flour stored for a couple of months or more develo ps a serious infestation. Our efforts to combat the problem have progressiv ely increased. Minimally, each infestation has been followed by a thorough cupboard emptying, vacuuming and wiping down. These days, all flour is imme diately placed in Tupperware (never mixing old and new supplies). It seems that the weevils do not appear in self-raising flour and that the recurrence of the problem is not down to a resident population getting into new stocks. Rather, it seems as though the weevil problem is endemic among the various shops that we buy from (major supermarkets). In fact, on more than one occasion, we've opened brand new bags and found substantial weevil populations already in place.
I don't recall my mother's baking cupboard having weevil problems when I wa s a kid, so as far as I am concerned, it's an experience limited to just th e last few years. I'd be interested, though, to find out whether other peop le have this problem.
Regards. Terry.