CATDOLL : CATDOLL: How many stages does the silkworm breeding season have? (From which month to which month does the silkworm breeding season start?)

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

The life of a silkworm is divided into four stages: egg, larva, pupa, and adult. Generally, the hatching period is 10 to 11 days, the larval stage is about 25 days, the pupa stage is 14 to 18 days, and the moth stage is 3 to 5 days. The life of a silkworm is about 56 days.

So the answer is: four stages: egg, larva, pupa and adult; about 56 days.

2. 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.

3. Silkworm breeding season?

Sericulture is generally carried out in spring and summer. Sericulture is an important skill of the working people in ancient my country. The method of planting mulberry trees and raising silkworms was invented by Leizu, the wife of Huangdi. Sericulture can eventually produce an important silk product, namely: silk. Silk occupies an important position in human economic life and cultural history. The main commodity of the famous historical event of the Silk Road was silk.

4. How many stages are there in the life of a silkworm?

The silkworm goes through four different stages in its life: egg, larva, pupa and adult.

Silkworms hibernate as eggs and hatch into larvae when mulberry trees sprout in spring. The larvae feed on mulberry trees and grow, then go into hibernation and molt after 4 days and begin to spin cocoons after about 25 days.

After two days, the silk is spun and the silkworms shed their skins and pupate in the cocoon after another 2-3 days. After about 10 days, the pupae become adults, which are silkworm moths. Male and female moths mate and lay eggs, and then die. In order to meet the production requirements of raising silkworms multiple times a year, the silkworm seed farm adjusts the incubation period of silkworm eggs through various technical measures such as staggered seed production seasons, cold storage of silkworm seeds, and hydrochloric acid impregnation, so that silkworm seeds can be supplied in different seasons in spring, summer and autumn. When the silkworms are dormant, they do not eat or move. On the surface, they are sleeping, but in fact they are molting, that is, they are shedding their old skins and putting on new ones in order to continue to grow. The silkworms that have just shed their skins are called awake silkworms, which means they wake up after sleeping. The larval stage of silkworms is based on dormancy and is divided into five instars. The larvae that have just hatched from silkworm eggs are called first-instar silkworms. After eating mulberry leaves for about 3 days, they start to sleep for about 1 day. After waking up from the first sleep, they are second-instar silkworms. After about two and a half days of the second instar, they start to sleep for about 1 day. After the second sleep, they are third-instar silkworms. The third instar lasts about 3.5 days, and the silkworm begins to sleep for about 1 day. The fourth instar lasts about 4 days, and the silkworm begins to sleep for about two days. After the fourth sleep, the silkworm becomes the fifth instar. The fifth instar lasts about 6-8 days. Before the cocoon is formed, the silkworm stops eating mulberry leaves, and the body shrinks and becomes translucent, which is called mature silkworm. The silkworms from the first to the third instar are usually called young silkworms, and the silkworms from the fourth and fifth instars are called adult silkworms.

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

The life of a silkworm: eggs laid by silkworm moths → hatching → cocoons and pupae → moths, completing the cycle of a new generation. This is the life history of a silkworm.

Silkworm eggs: Silkworm eggs look smaller than sesame seeds, and are round and flat. A female moth can lay 400 to 500 eggs. Silkworm eggs are light yellow when they are first laid, and turn into light red bean or red bean color after 1 to 2 days, and then turn into gray-green or purple after 3 to 4 days, and then they will not change again. Hatching silkworms is a bit like hatching chicks. When we were young, we usually put silkworm eggs in the pockets of our clothes and use our body temperature to accelerate the hatching. We would take them out and have a look when we had nothing to do. Silkworm eggs are like chicken eggs, with a hard shell on the outside, and yolk and serosal membrane inside. The embryo in the fertilized egg continuously absorbs nutrients during the development process, and gradually develops into an ant silkworm, which breaks out of the egg shell.

Ant silkworm: When the silkworm emerges from the eggshell, it is very thin and looks a bit like an ant, so it is called an ant silkworm. The ant silkworm is about 2 mm long and 0.5 mm thick. It will eat mulberry leaves 2 to 3 hours after crawling out of the eggshell.

Silkworm sleep: Silkworms eat a lot of mulberry, and the faster they eat, the faster they grow. When their body color gradually fades and their appetite gradually decreases until they completely fast, they will spit out a small amount of silk, fix their abdominal feet on the silkworm seat, raise their head and chest, and stop moving, as if they are asleep. This is silkworm sleep. The sleeping silkworm may seem motionless on the outside, but it is preparing to shed its skin inside. After shedding the old skin, the silkworm's growth enters a new stage, and it sheds four times from ant silkworm to spinning silk cocoon. Having a dormant nature is one of the growth characteristics of silkworms.

Silkworm age: from the first molt to the first molt is the first age; after waking up from sleep, it enters the second age; after molting again, it enters the third age; after the third molt, it enters the fourth age, and the fourth molt is the long sleep. After the long sleep, it enters the fifth age. The fifth-age silkworms grow very fast. The longest silkworm we raised this time reached 8 cm.

Mature silkworms: When silkworms reach the end of the fifth instar, they gradually show the characteristics of maturity: first, the feces they excrete clearly change from dark green to leaf green; their appetite decreases, and the amount of mulberry food they eat drops significantly; their chest becomes transparent; their bodies turn a little yellow, and then they stop eating completely. Their bodies shorten, and their abdomens tend to be transparent. Their head and chest are raised, they spit out silk threads from their mouths, and they swing left and right and up and down to find a place to build their cocoons. These silkworms are called mature silkworms.

Cocooning: After the silkworms are mature, they are placed in a special container or on a cocooning device, and the silkworms will spin silk and spin cocoons. (The cocooning device is the place for making cocoons. Some branches or chopsticks can be used to make a #-shaped or trident frame.) The process of silkworm cocooning is roughly as follows: the mature silkworms find a good place to make cocoons, first spin out silk, and stick it on the cocooning device to form a cocooning frame, that is, a cocooning net. Continue to spin out messy silk circles to thicken the inner layer of the cocoon net, and then spin silk in an 8-shaped manner, and the outline of the cocoon begins to appear, forming a cocoon coat. After the cocoon coat is formed, the cocoon cavity gradually becomes smaller, and the silk continues to be spun to thicken, which begins the process of forming a cocoon layer. When the silkworm's body is greatly reduced due to spinning a large amount of silk, a loose and soft cocoon silk layer is finally formed, which is called the pupa lining.

Silkworm pupa: About 4 days after the silkworm makes a cocoon, it will turn into a pupa. 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.

Silkworm moth: The silkworm moth that emerges from the cocoon loses its ability to fly because of its two pairs of small wings. The female moth is large and crawls slowly. The male moth is small and crawls faster, with its wings vibrating rapidly, looking for a mate. Generally, after mating for half a day, the female moth can lay fertilized eggs. After mating, the male dies, and the female moth can lay about 500 eggs in one night, and then slowly dies.