CATDOLL : CATDOLL: The Four Stages of Silkworm Raising (Writing on the Four Stages of Silkworm Raising)

1. What are the four stages of a silkworm’s life?

The life cycle of a silkworm is from egg to larva, and then from larva to pupa.

, and then from the pupa to the adult, these four stages are metamorphosis insects.

Silkworm eggs: Silkworms reproduce by eggs. Silkworm eggs look like fine sesame seeds, about 1 mm wide and 0.5 mm thick. A female moth can lay 400 to 500 silkworm eggs. 1700 to 2000 silkworm eggs weigh about 1 gram and have a diameter of 0.2 cm. The color of silkworm eggs is light yellow or yellow when they are first laid, and changes to light red bean color or red bean color after 1 to 2 days, and then turns to gray-green or purple after 3 to 4 days. It no longer changes and is called a fixed color.

2. What are the four stages in a silkworm’s life?

The silkworm's life cycle consists of four stages: egg, larva, pupa, and adult. Silkworms eat a lot of mulberry, so they grow very fast and their body color gradually fades.

But its appetite gradually decreases and it even stops eating completely. It spits out a small amount of silk, fixes its abdominal feet on the silkworm seat, raises its head and chest, and stops moving, as if it is asleep. This is called "sleeping".

3. What are the summary stages of silkworm rearing?

The life of a silkworm goes through four stages: silkworm egg → larva → silkworm pupa → silkworm moth. The growth and development of silkworms are related to temperature, humidity, food, etc., and the incubation period is generally 10 to 11 days.

The larval stage is about 25 days (specifically, 4 to 5 days for the first instar, 3 to 4 days for the second instar, 4 days for the third instar, 6 days for the fourth instar, and 6 to 8 days for the fifth instar), the pupal stage is 14 to 18 days, and the moth stage is 3 to 5 days.

After the moth emerges from its phoenix, it stops eating and its wings harden about an hour later. After the wings harden, it mates. Each female moth lays about 300 to 500 eggs.

The purpose of silkworms transforming into moths is to mate and lay eggs.

4. What are the four stages of a silkworm’s life?

The life cycle of a silkworm consists of four stages: egg, larva, pupa and adult.

Silkworm eggs:

Silkworms reproduce by laying eggs. Silkworm eggs look like fine sesame seeds, about 1 mm wide and 0.5 mm thick. A female moth can lay 400 to 500 silkworm eggs. 1700 to 2000 silkworm eggs weigh about 1 gram and have a diameter of 0.2 cm. The color of silkworm eggs is light yellow or yellow when they are first laid, and changes to light red bean color or red bean color after 1 to 2 days, and then turns to gray-green or purple after 3 to 4 days. It no longer changes and is called a fixed color.

The outer layer of the silkworm egg is a hard eggshell, and inside is yolk and serous membrane. The embryo in the fertilized egg continuously absorbs nutrients during the development process and gradually develops into a silkworm. It crawls out of the eggshell, and the eggshell becomes white or light yellow after it is empty.

The first instar is four to five days; the second instar is three to four days; the third instar is four days; the fourth instar is six days; the fifth instar is seven to nine days; the pupal stage is fourteen to eighteen days; and the moth stage is three to five days.

larva:

When the silkworm hatches from the egg, its body is brown or black, very small, and covered with fine hairs, and it looks a bit like an ant, so it is called ant silkworm. The ant silkworm is about 2 mm long and 0.5 mm wide. After it crawls out of the egg shell, it will eat mulberry leaves after 2 to 3 hours.

silkworm chrysalis:

After the silkworms spin cocoons on the cocoon nest, they will turn into pupae after about 4 days. The body shape of the silkworm pupa is like a spindle, with three body sections: head, thorax and abdomen. The head is very small, with compound eyes and antennae; the thorax has thoracic legs and wings; the bulging abdomen has 9 body segments. Professional workers can distinguish the sex of silkworms from the lines and brown dots on the abdomen of the silkworm pupa. When the silkworms first pupate, their body color is light yellow and the pupa body is tender and soft. Gradually, it will turn into yellow, yellow-brown or brown, and the pupa skin will also harden. After about 12 to 15 days, when the pupa body begins to soften again and the pupa skin is a little wrinkled and earthy brown, it will turn into a moth.

5. What are the four stages of a silkworm's life? How many days does a silkworm's life cycle last?

After the four stages of egg-larva-pupa-adult, its development is incomplete metamorphosis. How long does it take for silkworms to go through each stage: The growth and development of silkworms are related to temperature, humidity, food, etc., and the accelerator period is generally ten to eleven days. The larval stage is about twenty-five days (specifically, the first instar is four to five days; the second instar is three to four days; the third instar is four days; the fourth instar is six days; the fifth instar is seven to nine days.) The pupal stage is fourteen to eighteen days. The moth stage is three to five days. After the silkworm moth emerges, it no longer eats, and its wings will harden after about an hour. After the wings harden, it will mate. Each female moth will lay about 300 to 400 eggs. The purpose of silkworms emerging into moths is to mate and lay eggs.

6. What are the four stages in the life of a silkworm?

The first stage is hatching. The silkworm eggs are similar in appearance to white sesame seeds. As they slowly change, the silkworm babies will emerge from the eggshells, resembling small ants and are called mosquito silkworms.

The second stage is growth. The ant silkworm starts to eat mulberry leaves and slowly turns white. After four moltings, it grows into a larva and is ready to spin silk.

The third stage is cocooning. The silkworm needs two days to spin silk to make a cocoon and then turn into a pupa inside the cocoon.

The fourth stage is the adult. After about ten days, the silkworm breaks out of the cocoon and becomes an adult. It mates in a short period of time, lays sperm and eggs, and then gradually dies.

7. What is the sequence of changes during a silkworm’s life?

The growth process of silkworms is divided into four stages: egg, larva, pupa and adult.

1. The silkworms have hatched

The silkworm ants that have just hatched from their eggs are black and are called "ant silkworms". They are covered with fine hairs, which will not be noticeable after about two days.

2. The silkworms have grown up

Silkworms feed on mulberry leaves. After continuously eating mulberry leaves, their bodies turn white. After a period of time, they begin to shed their skin. The molting period lasts for about a day, and they do not eat or move, just like sleeping. This is called "hibernation."

3. The silkworms are spinning silk

After molting once, it becomes a second-instar larva. Each time it molts, it ages one year older. It has to molt four times in total, becoming a fifth-instar larva before it begins to spin silk and make cocoons.

4. The silkworms are producing cocoons

It takes two days and two nights for a five-year-old larva to form a cocoon, and then shed its skin for the last time in the cocoon to become a pupa.

5. Silkworms emerge from their cocoons

After about ten days, the moth emerges from its cocoon and becomes a silkworm moth. After emerging from the cocoon, the female moth emits a scent from its tail to attract the male to mate. After mating, the male dies. The female moth can lay about 500 eggs in one night and then slowly dies.