In summer, students often catch or see "Sister Hua", which is a very attractive flying insect, the size of soybeans, like a half ball, with hard wings and bright colors.

This small beetle is a ladybug of Arthropoda, Insecta, Coleoptera and Coccinellidae. It also has many nice names, such as "matchmaker", "chubby little", "winner worm" and so on.

Ladybugs have two wings. The first layer is the beautiful shell we see, which plays a protective role and is called COLEOPTERA. The second layer is thin and soft under COLEOPTERA, which is a tool for ladybugs to fly.

There are many kinds of ladybugs, but some ladybugs are not beneficial, such as eleven-star ladybugs and twenty-eight-star ladybugs. They are not beneficial insects, but pests. But two-star ladybugs, six-star ladybugs, seven-star ladybugs, twelve-star ladybugs, thirteen-star ladybugs, red-star ladybugs and so on are all beneficial insects.

The favorite food of beneficial ladybugs is aphids, scale insects, ticks and other pests, and their larvae also feed on these pests. Ladybugs especially like aphids. When they see them, they must eat them up. A ladybug can eat 100 aphids a day. Aphids are a kind of Homoptera, a winged subclass of Insecta. They have stinging mouthparts, suck plant juice and nutrients for food, and are important pests of crops and fruit trees. Aphids are clumsy, with big bellies, thin feet and slow movements. Even winged aphids have poor flying skills, so ladybugs can easily prey on them.

If you use pesticides to control aphids, it is difficult to catch them all. Using ladybugs to prevent aphids will get twice the result with half the effort.

It is also a kind of HOMOPTERA, and it is not afraid of pesticides. Because there is a layer of wax outside its body, it is fixed on the branches, so it is difficult to observe whether it is dead or alive. The most economical and safest way to completely eliminate it is to use red ladybugs and Australian ladybugs among ladybugs. Australian ladybugs can lay eggs on eggshells or wax films of scale insects. After the larvae hatch, they feed on the eggs or hatched larvae of scale insects, or they can crawl into the body of scale insects and eat their internal organs.

Ladybugs work much better than pesticides. It helps people to control pests and increase the output of crops and fruit trees, so it is a beneficial insect.