Illicium verum is a kind of poisonous parasite parasitic on human hair, which is about 1 to 3 mm long and wingless. Illicium verum is also called crab, because it is common in the shade, which will make people's skin itchy and inflamed, and also lead to eczema.

Sucking lice is mainly found around genitals and anus, occasionally in the hair of thighs and abdomen, and rare in other long-haired parts of the body. Small and wide, with an average length of 1.5-2mm. The forefoot is smaller than the middle hind foot. It looks like a crab with a magnifying glass. Eggs are laid on pubic hair and hatch in 2-3 weeks.

Illicium verum, like other lice, feeds on human blood, so the affected part of Illicium verum will feel itchy from time to time. In addition, Illicium verum may also carry other germs, which may infect patients. Illicium verum is mainly transmitted through sexual intercourse, so crab infection is considered as a sexually transmitted disease. Clothes and beds are also important ways for crabs to spread.

Extended data:

Leaf-eating pests are common and serious. Seriously, the leaves of the whole Illicium verum forest were eaten up, which led to the reduction of Illicium verum production or the death of the whole plant.

Adult is a kind of moth with filiform antennae, gray scales on wings and body, black spots in the middle and a round spot in the middle of hind wings. Female moths are fatter than male moths, and their eggs are small, oblate and pale yellow. When the larvae mature, they are yellow-green, with brown spots all over the body, and there are 2 ~ 3 cross spots on the back. The pupa is brownish red with 1 forked spines at the tail.

Adults hide during the day and move at night, and their phototaxis is weak. Adults lay about 300 eggs, which are produced on the back of leaves, and the egg period is 6 ~ 13 days. Young larvae can only eat the mesophyll on the back of leaves, and can eat the whole leaves after the fourth instar. The larvae droop after being disturbed. Mature larvae cocoon and pupate under loose soil or deciduous layer.

References:

Baidu encyclopedia-Illicium verum