What is the difference between a ladybug and an Asian bug?

There isn't much of a difference. True, they're all a different species of insect, but their life cycles and their predatory natures are much the same. Both lady bugs and Asian lady beetles eat aphids and a multitude of different crop-killing insects and mites. Both the Asian lady beetle and the American lady bug are considered tremendously beneficial insects for agricultural purposes. Asian beetles were brought to America because they tended to eat aphids that fed on trees, rather than crops and garden vegetation.