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Recent research shows that yes Ladybugs do migrate at the end of the summer/early fall, but if the Do-it-your self farmer/gardener can improve the stay of their friendly Ladybug herd by providing them a nesting box, home or house. They eat other insects besides aphids like plant lice, whitefly and scale insects.
Two years of research show that most ladybugs leave to look for a home they make home from a squirrel hollowed out hole in a tree where they become pray from birds.
I have had good luck with a house designed for the Convergent lady beetle,
Scientific name: Hippodamia convergens, which is native to California. The Best Lady Bug House takes in consideration of their basic needs: Location, Food, Shelter, Protection , and a nourishing Environment.