The ladybugs, or officially called ladybird beetles (Harmonia axyridis), that have increased in number in the midwest are a species that have been introduced from Asian. They are very aggressive (you may have noticed that they will bite you) and eat a lot of aphids. They are out-cpmpeting the native species of ladybird beetles because they are bigger and more aggressive. Entomologists have not figured out how to slow their spread or reproductive activities. Even the cold winters do not kill back their numbers and their populations will likely continue to increase until a predator or disease can impact them in the opposite direction.
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