Sift the flour from the bag. Place the sifted flour in a clean plastic container.
Flour beetles, grain beetles, meal moths, and weevils are all types of insects that infest flour and grain items. They find their way into bags of dry food and proceed to lay eggs. This is a survival mechanism for the insects: once hatched, the larvae will have instant access to food. Also, because these insects prefer a humid environment, houses are the perfect environment for reproduction since we tend to keep our homes warm.
Place the container in the freezer for a week. The eggs cannot thrive in cold temperatures and will die.
Clean out your cupboard shelves thoroughly while the flour is in the freezer. Use cleaning agents to disinfect the area, and take a vacuum to eliminate crumbs in the corners and crevices.
Remove the container from the freezer after a week. Place the container in your clean cupboard for a few days to thaw.
Repeat steps two and four. This will kill any eggs that survived the first freezing.
Sift the flour again and place it in an air-tight container. Place the container in your clean cupboard.
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