The Pantry Staple That Keeps Bugs Out Of Your Flour - Tasting Table
Briefly

Many home cooks struggle with bugs, particularly weevils, invading their flour. Fortunately, dried bay leaves can serve as a natural deterrent against these pests. Adding a few bay leaves to your flour canister can help keep the bugs at bay due to their strong aroma, which is unpleasant for insects. Although the scientific backing for this method is limited, many people have reported success using this simple kitchen ingredient while cooking.
According to a fair amount of anecdotal data from everyone from home cooks to pest control companies, throwing a few bay leaves in your flour canister is all you need to do to keep the bugs out.
It is thought that pantry pests are turned off by the smell of bay leaves, which is quite strong to them. The essential oil eucalyptol...has been shown to repel insects like mosquitoes.
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