CATDOLL : CATDOLL: What does the silkworm need to grow?

1. What is the growth process of silkworms?

When they are just laid, they are light yellow or yellow, then after 1-2 days they turn into light adzuki bean color or adzuki bean color, then after another 3-4 days they turn into gray-green or purple and no longer change.

Then, the silkworms begin to hatch, which takes about 8-9 days. After the silkworm eggs hatch, they are covered with fine hairs and are called ant silkworms.

For many silkworm farmers, hatching silkworm eggs is a relatively big problem. In the past, farmers would buy silkworm eggs one by one and take them home to hatch them themselves. However, due to insufficient technology, the survival rate of most people's silkworm eggs was very low.

Later, some skilled silkworm farmers began to hatch silkworm eggs themselves, raise the silkworms to three years old, and then sell them to surrounding farmers. This not only increased their own income, but also reduced the risks of breeding for surrounding farmers.

The larval stage of a silkworm lasts about 25 days, and it molts four times in total, with each molting adding one year to its age.

From the time the ant silkworm molts for the first time, it is the first instar, which is about four to five days; it hibernates for one day, and then enters the second instar after waking up, which is about three to four days; after molting again, it enters the third instar, which is about four days; after the third molt, it enters the fourth instar, which is about six days.

Finally, the fourth molting, also known as the big sleep, begins, and the silkworm enters the fifth instar. The fifth instar lasts seven to nine days, and the silkworm stops eating mulberry leaves and prepares to spin silk and make cocoons.

2. How do silkworms grow?

The growth process of silkworms is divided into four stages: eggs, larvae, pupae and adults. The silkworms that have just hatched from the eggs are black. They look like ants and are called ant silkworms. Their bodies are covered with fine hairs, which will no longer be obvious after about two days.

Silkworms feed on mulberry leaves. After eating mulberry leaves continuously, their bodies will gradually turn white, and after a period of time, they will begin to shed their skin.

It takes about a day to molt, and the larvae do not eat or move, just like sleeping. This is called dormancy. After molting once, they are the second-instar larvae. Each time they molt, they grow one year older. They molt four times in total, and then they become the fifth-instar larvae to spin silk and make cocoons. The five-year-old larvae need two days and two nights to make a cocoon, and molt for the last time in the cocoon to become a pupa. After about ten days, they break out of the cocoon and become silkworm moths.

3. How do silkworms grow?

Silkworms eat mulberry leaves and slowly shed their skin to grow. Introduction: The life of a silkworm is divided into four stages: egg, larva, pupa, and moth. The newly hatched silkworm is called a first-instar silkworm. Because it is black and small, it is also called an ant silkworm. It will shed its skin four times during the larval stage. During this period, the silkworm grows one instar each time it sheds its skin, and its body grows a little bit, and it grows bigger, thicker, and whiter.

After molting four times, the silkworm becomes a fifth-instar silkworm. At that time, the silkworm will spin silk and make cocoons after eating mulberry leaves for a few days.

Silkworms are Lepidoptera insects. They feed on mulberry leaves and spin silk cocoons. They are one of the economic insects. Silkworms originated in China. As early as four or five thousand years ago, our ancestors planted mulberry trees and raised silkworms. This is one of the great discoveries recognized by the world. The growth process is as follows:

1. The silkworms that have just hatched from the eggs are black and hairy, like ants, and are called ant silkworms.

The ant silkworms grow slowly while eating mulberry leaves. After a while, they stop eating and moving, and enter a sleep state, just like a person sleeping.

After one or two days, it sheds its skin and starts eating mulberry leaves again, continuing to grow. This repeats four times until it reaches maturity.

2. Young silkworms not only grow fast but also tend to be crowded together. Therefore, you should expand and even out the seats before feeding them with leaves each time. After feeding, you should properly adjust the seat area of ​​the silkworms and leaves to achieve "one silkworm in three places" so that the silkworms do not touch each other, which is beneficial to their growth and development.

As the silkworm continues to eat mulberry leaves, its body slowly turns white, and after a period of time it begins to shed its skin. The shedding period lasts for about a day, during which it does not eat or move, like sleeping. This is called "hibernation."

The climate is good during the spring silkworm production period, the leaf quality is excellent, and the cocoon quality is good, making it easy to obtain high cocoon yields, which generally account for about 40% of the total annual cocoon production.

Therefore, raising spring silkworms well is the key to increasing silkworm farmers' income and completing the annual cocoon production task.

Although the climate is good, pathogens are few, and leaf quality is high during the spring silkworm period, silkworm diseases will occur in the later stage of spring silkworms if the disinfection of silkworm rooms and silkworm tools is neglected.

Young silkworms need to be fed with young leaves, while adult silkworms need to be fed with older leaves, because silkworms need to consume enough cellulose to spin enough silk to make cocoons.

If the mulberry leaves contain dew, etc., they need to be dried before feeding. If the mulberry leaves turn black and moldy, do not feed them to silkworms.

If the ambient temperature is too low, it is recommended to buy a heating lamp to heat the silkworms, so that you can raise silkworms all year round.

3. There is a pair of special organs called silk glands inside the body of the silkworm. The body of a mature silkworm is transparent and filled with silk.

It spins silk to make a cocoon around its body, and then sheds its skin again after spinning the silk, turning into a peanut-sized pupa, which does not eat or move, and stays dormant inside the cocoon. Ten days later, the pupa turns into a moth and emerges from the cocoon.

4. After the cocoon is out, the female moth's tail emits a smell to lure the male to mate. After mating, the male dies. The female moth can lay about 500 eggs in one night, and then slowly dies. From the first sleep to the fourth sleep, it takes about one month. So the life span of the silkworm is very short, just over a month. Extended information: Commercial value According to literature records and cultural relics, our ancestors began to plant mulberry trees and raise silkworms as early as the Neolithic Age more than 5,000 years ago.

The use of silk began at the end of the fishing and hunting era, while sericulture began at the beginning of the agricultural era, that is, the Yellow Emperor era.

During the Zhou Dynasty (1066-256 BC) sericulture had become specialized and came under official supervision.

By the Warring States Period (476-221 BC), silk had reached a high level of development, and had become the daily clothing of the poor and a commodity for free trade.

Many silk fabrics from the Warring States Period have been unearthed in various parts of China, including gauze, satin, damask, gauze, crepe, brocade, brocade, and embroidery. The beauty of their patterns and colors is astonishing.

During the Song and Yuan dynasties (960-1368 AD), silk production and silk weaving reached another peak. The Song Dynasty produced 3.4 million pieces of silk annually, and the rulers attached equal importance to the silk industry and farming.

There are often records of "combining agriculture and sericulture" in ancient Chinese books.

The idiom “A woman who does not raise silkworms may suffer from the cold” reflects the ancient people’s high awareness of sericulture.

4. What and what do the growth of silkworms need to indicate?

The growth of silkworms requires sufficient mulberry leaves, temperature changes, and a clean environment. In the process of raising silkworms, people must have sufficient food sources, and the mulberry leaves used to feed the silkworms must not be contaminated or corrupted. Silkworms are also very important to air and environmental hygiene, especially indoor temperature control. Windows should be opened frequently for ventilation to keep the room clean.

5. What is the growth process of silkworms?

The life of a silkworm goes through the process of silkworm eggs, ant silkworms, mature silkworms, silkworm cocoons, and silkworm moths, which takes more than 40 days. The specific process is as follows: 1. Silkworms reproduce with eggs. Silkworm eggs look like fine sesame seeds, about 1 mm wide and 0.5 mm thick. When the temperature rises, the silkworm eggs begin to develop. After 7-15 days, when the silkworm eggs become transparent and the outline inside can be seen, it means that the silkworms are about to come out! 2. The silkworms that have just hatched from the eggs are black like ants. We call them "ant silkworms". They are covered with fine hairs, which will not be obvious after about a few days. Silkworms have an appetite about 40 minutes after hatching, and the feeding process should begin at this time. 3. Silkworms live on mulberry leaves. After eating mulberry leaves continuously, their bodies turn white, and they begin to shed their skin after a period of time. Silkworms do not eat or move when they sleep. They seem to be sleeping, but they are actually shedding their old skins and replacing them with new ones to continue growing. During the whole breeding process, the silkworm will molt 4 times. Each time it molts, it will not eat or move. Try not to disturb it at this time, and don't throw it away thinking it is sick. Each dormancy period of the silkworm lasts about one day. 4. After molting once, it is the second-instar larva. It will be one year older each time it molts. It will molt four times in total and become a fifth-instar larva before it starts to spin silk and make cocoons. 5. Generally, it starts to make cocoons around 25 days. When the silkworm's back is shiny, yellow and transparent, it means that it is about to spin silk and make cocoons. At this time, a cross space should be provided for the silkworm to make cocoons. It takes two days to form a complete cocoon, and complete the last molting in the cocoon to become a pupa. 6. About ten days later, it will become a silk moth and break out of the cocoon. After the cocoon, the female moth's tail emits a smell to lure the male to mate. After mating, the male dies. The female moth can lay about 500 eggs in about one night, and then it will slowly die. Living habits Silkworms are oligophagous insects. In addition to mulberry leaves, they can also eat mulberry leaves, elm leaves, grape leaves, scorzonera, dandelions and lettuce leaves, but eating these will increase the mortality rate. The nutrients necessary for silkworms include protein, carbohydrates, lipids, vitamins, inorganic salts and water. Mulberry leaves are the most suitable natural food for silkworms. After eating mulberry leaves, the larvae grow rapidly. Under suitable temperature conditions, a silkworm molts once every 6-9 days from hatching to spinning cocoons, which takes about 24-32 days in total. It eats about 20-30g of mulberry leaves (5-6.2g of dry matter). Generally, after four dormancy and molting, the weight increases by about 10,000 times when it grows to the extreme. Spinning silk and making cocoons is an instinct of mulberry silkworms to adapt to the environment and survive. Mulberry silkworm cocoons can be reeled into silk, which is a precious textile raw material and is also widely used in military industry, electrical engineering and other fields. Silkworm pupae, moths and silkworm feces can also be used comprehensively. They are raw materials for many chemical and pharmaceutical industries, and can also be used as nutrients for plants. Silkworms are holometabolous insects. In one generation, they go through four developmental stages: egg, larva, pupa, and adult. The number of generations that occur naturally in a year is called diapause. One generation in a year is called monopodialism, two generations in a year is called dipodialism, and three or more generations in a year are called polypodialism. There are also polypodial species in tropical areas that do not diapause all year round. The temperature range for development varies with the development period, generally between 7 and 40 degrees Celsius, and the temperature range for normal development is 20 to 30 degrees Celsius.

6. What do silkworm larvae need during their growth?

Silkworm larvae need to shed their skin during their growth. Silkworms are insects that undergo complete metamorphosis. They go through four stages in their life: egg, larva, pupa, and adult. The skin of silkworms cannot grow as their bodies grow. Then the silkworms spin silk and make cocoons, preparing to emerge as adults.

Silkworm larvae need to shed their skin during their growth. Silkworms are insects that undergo complete metamorphosis. They go through four stages in their life: egg, larva, pupa, and adult. The skin of silkworms cannot grow with their bodies.

In the larval stage of silkworms, if their skin can no longer accommodate their grown bodies, their appetite gradually decreases or even stops eating. They spit out a small amount of silk, fix their abdomen and feet on the silkworm seat, raise their head and chest, and stop moving, as if they are asleep. This is called "sleeping". The sleeping silkworms may seem motionless on the outside, but they are preparing to shed their skin inside. After shedding their old skin, the silkworms enter a new stage of growth, and they shed their skin four times from ant silkworms (young silkworms that have just hatched from eggs) to spinning silk and making cocoons.

From hatching to spinning cocoons, a silkworm molts every 6-9 days, a total of about 24-32 days. Generally, after four dormancy and molting, the weight increases by about 10,000 times when it reaches the maximum growth. Then the silkworm spins silk and spins cocoons, preparing to emerge as an adult.

7. What is the whole process of silkworm growth and development?

Silkworms feed on mulberry leaves. After eating mulberry leaves continuously, their bodies turn white and they begin to shed their skins after a period of time. After molting once, they become second-instar larvae. Each molt adds one year to their age. They have to molt four times in total, and only when they become fifth-instar larvae can they start spinning silk and making cocoons.

Silkworms are completely metamorphosed insects. One generation of silkworms must go through four completely different developmental stages: eggs, larvae, pupae, and moths. Under normal feeding conditions, it takes 20 to 28 days for the larvae to hatch and eat mulberry leaves, and to spin silk and make cocoons. It takes about 3 days to spin silk and make cocoons, and then 1 to 2 days to pupate. After 10 to 15 days of pupal stage, they will turn into moths, and then moths will become adults. On the day of moth transformation, male and female adults mate and lay eggs. If the eggs laid are non-diapause eggs, then the next generation of ant silkworms can hatch after about 10 days. In this way, it takes about 40 to 60 days for silkworms to complete a generation, and they are passed down from generation to generation in constant metamorphosis.

8. What are the 8 growth stages of silkworms?

1. Incubation

The silkworms that have just hatched from eggs are called ant silkworms. They are covered with fine hairs, which will become less noticeable after about two days.

Silkworms live on mulberry leaves. After eating mulberry leaves continuously, their bodies turn white. After a period of time, they begin to shed their skin. 3. Silkworms do not eat or move when they sleep. On the surface, they are sleeping, but in fact, they are shedding their old skin and replacing it with a new one to continue growing. Silkworms shed their skin 4 times during the entire breeding process. Each time they shed their skin, they do not eat or move. At this time, try not to disturb them, and do not throw them away thinking they are sick. Each sleep period of silkworms lasts about one day. 3. Silkworms spin silk

4. After molting once, it is the second instar larva. Each molt is counted as one year older. It takes four molts in total to become the fifth instar larva before it starts spinning silk and making cocoons.

Generally, the silkworms start to spin cocoons around 25 days old. When the silkworms' backs are shiny, yellow and transparent, it means that they are about to spin silk and spin cocoons. At this time, a cross-space should be provided for the silkworms to spin cocoons. 6. It takes two days to form a complete cocoon, and the silkworms complete the last molting in the cocoon and become pupae. 7. Break out of the cocoon

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

9. What do silkworms need for growth and development?

1. Temperature: The suitable growth temperature for 1-3-year-old silkworms is 26-27°C, the suitable growth temperature for 4-year-old silkworms is 25-26°C, and the suitable growth temperature for 5-year-old silkworms is 24-25°C. 2. Humidity: The relative suitable humidity for 1-2-year-old silkworms is 90%, the relative suitable humidity for 3-year-old silkworms is 85%, the relative suitable humidity for 4-year-old silkworms is 70-75%, and the relative suitable humidity for 5-year-old silkworms is 70%.

1. What conditions are required for the growth and development of silkworms?

1. The suitable temperature for the growth of 1-2 year old silkworms is 26-27℃ and the relative humidity is 90%. The suitable temperature for the growth of 3-year old silkworms is 26-27℃ and the relative humidity is 85%. The suitable temperature for the growth of 4-year old silkworms is 25-26℃ and the relative humidity is 70-75%. The suitable temperature for the growth of 5-year old silkworms is 24-25℃ and the relative humidity is 70%. When the temperature is higher than 30℃, it needs to be cooled down, and when the temperature is lower than 20℃, it needs to be heated up.

2. During the period of young silkworms, if it is in the early stage of hibernation, the relative humidity in the room should be kept at about 80%. When the silkworms are about to start, the relative humidity in the room should be kept at about 85%.

3. During the period of adult silkworms, the temperature during dormancy should be about 0.5-1℃ lower than the temperature during instar growth. The humidity in the early stage of dormancy should be controlled at about 75-80%, and the humidity in the late stage of dormancy should be controlled at about 80-85%.

2. What is the relationship between the growth and development of silkworms

The growth and development of silkworms are related to temperature and humidity. In addition, ensuring the quality of mulberry leaves is also key.

1. 1st instar silkworm

(1) Mulberry leaves: Generally, the third mulberry leaf from the top bud on the mulberry tree is used. The leaf color is yellow with green. At the same time, the mulberry leaves are cut into small cubes 1.5 times the length of the silkworm body.

(2) Amount of mulberry leaves fed to silkworms: The total amount of mulberry leaves fed to silkworms with one sheet of silkworm seeds is about 1 kg.

2. 2nd instar silkworm

(1) Mulberry leaves: Generally, the fourth mulberry leaf from the top bud on the mulberry tree should be used. The leaf color should be green with yellow. The mulberry leaves should be cut into small cubes 1.5 times the length of the silkworm body.

(2) Amount of mulberry leaves fed to silkworms: The total amount of mulberry leaves fed to silkworms with one sheet of silkworm seeds is about 3 kg.

3. 3rd instar silkworm

(1) Mulberry leaves: Generally, the 5th to 6th mulberry leaves from the top bud on the mulberry tree are selected. The leaves are light green and shiny. At the same time, the mulberry leaves are cut into triangles before feeding.

(2) Amount of mulberry leaves fed to silkworms: The total amount of mulberry leaves fed to silkworms with one sheet of silkworm eggs is about 10-12 kg.

4. 4th instar silkworm

(1) Mulberry leaves: Generally, the 7th to 15th mulberry leaves from the top bud on the mulberry tree are selected, and the leaves must be fresh.

(2) Mulberry leaf feeding amount: For every 10g of mulberry leaf, the total feeding amount is about 65kg.

5. 5th instar silkworm

(1) Mulberry leaves: There must be no tender leaves, no old yellow leaves, no insect-infested leaves, and no poisonous leaves. At the same time, they must be sufficiently fresh and the storage time must not exceed 12 hours.

(2) Mulberry leaf feeding amount: For every 10g of mulberry leaf, the total feeding amount is about 385kg.