Chigger mites; ; Chigger mites are chigger mites superfamily of Acari. Commonly known as chigger mites, also known as chigger mites. About 3000 species and subspecies are known in the world. There are about 400 species known in China. Global distribution, mainly in warm and humid Southeast Asia and tropical rain forests. China has the largest number of provinces from the southeast coast to the southwest border. Larvae is oval or ovoid, red, orange, khaki or milky white. The body length is 0.2 ~ 0.5 mm, and it can reach 0.5 ~ 1 mm after eating. Life history is divided into seven stages: egg, prophase larva, larva, nymph, nymph, adult and adult. In the larval stage, they have to climb on the host to feed, and in other stages, they live freely in the shallow soil on the ground, and a few species breed in the nests of animals. Larvae attack mammals, birds, reptiles and amphibians. Some species attack the human body and can spread diseases. Distributed all over the world, mainly in warm and humid Southeast Asia and tropical rain forests. There are many kinds of chigger mites in Southeast Asia, which is the most concentrated area in the world. China has the largest number of provinces from the southeast coast to the southwest border. Although the Qinghai-Tibet Plateau is dry and cold, there is also a local microclimate suitable for chigger mites to survive. Can't fly.