In winter, ladybugs overwinter between wheat and rape roots, and some overwinter in sunny clods and soil cracks. In spring, once the temperature rises above 10℃, the overwintering ladybugs wake up and start to move, which can be seen on wheat and rape plants. In summer, with the increase of temperature and food, ladybug septempunctata proliferates. All plants parasitized by aphids and scale insects, such as cotton, willow, locust tree, elm, beans and other plants, can find ladybugs, and sometimes even gather in large numbers. In autumn, the number of ladybugs decreases, and they often lay eggs on corn, radish and cabbage. At this time, the temperature is low in the morning and evening, and the ladybug is often hidden and not easy to be found.