First, the larvae of flies are 1. The larvae of flies are called maggots, which are hatched after the flies lay eggs. It is about 2 cm long and walks by peristalsis.

2. It is divided into three stages: 1, 2 and 3, and molts once in each stage, and the color changes from transparent and milky white to milky yellow.

3. 1 instar worms are 1-3mm long and have posterior lobes; The 2 nd instar worm is 3-5 mm long, and there are 2 cracks in the front lobe and the back lobe. The body length of the 3rd instar worm is 5- 13mm, and the posterior lobe is 3-lobed.

Second, what do fly maggots eat? 1. Fly maggots feed on the spot in their habitats, and they like protein in animal feed, plant feed and microorganisms.

2, 3-year-old maggots will stop feeding, leave the breeding ground at low temperature and humidity, and drill into the nearby loose soil to pupate.

Third, the development process of fly 1. In the egg stage (1), the egg is milky white, banana-shaped or oval, about 1 mm long. There are two ridges on the back of the egg shell, and the membrane in the middle of the ridge is the thinnest, from which the larvae emerge during hatching.

(2) The development time of the egg stage is 8-24 hours, and the larvae can hatch at 15-40℃ for several hours.

2. Larvae (1) Larvae is also called fly maggot. It is afraid of the sun, likes to make holes, and lives in a dark place.

(2) It was divided into 1, 2 and 3 stages, and molted once in each stage, and the color changed from transparent and milky white to milky yellow.

(3) Leave the breeding ground after the 3rd instar and drill into the loose soil nearby to pupate.

3. In the pupal stage (1), the body color changes from light to dark, and finally turns into millet brown, with a body length of 5-8 mm..

(2) After the embryonic morphology is formed, it enters the eclosion stage. During eclosion, the fly alternately expands and contracts by the frontal sac of the head, pushing the head end of the pupa shell away and crawling out.

4. Adult flies (1) have big compound eyes and about 4000 small eyes on their heads, so their vision is very sensitive.

(2) Adult flies also have a sense of smell. The sense of smell is located on the antenna and the taste organ is located on the foot.