Silkworms need to go through four stages in their life: eggs, ants, pupae, moths, and moths, the moth period is usually 3-5 days, and after a long time, they will die, and *** lasts for more than fifty days. Silkworms are beneficial insects that can spit silk cocoons.

One, the silkworms go through four stages

1, egg: is oval, a little smaller than a grain of rice, gray-green or gray-purple color, about 1700 ~ 1800 per square centimeter.

2, larvae (silkworms): the shape of the silkworm is divided into head, thorax and abdomen. The head is usually called the mouth, thorax three links, there are three pairs of thoracic legs, abdominal ten links, there are four pairs of abdominal legs. Each square centimeter ant silkworms about 2100 ~ 2300 head.

3, pupa (cocoon): ripe silkworms on the cluster about the fifth day of pupation. The body of the pupa is spindle-shaped, yellowish brown.

4, adult (moth): with a pair of white scaly wings, but can not fly. Crossing and laying eggs for 2 to 3 days and then die. A moth lays about 400-600 eggs.

Two, age distinction

Silkworms in the development process, from hatching to cocoon, generally after four sleep, five age. Silkworms go through due to species, feeding season and feeding conditions and other different lengths. In the spring of 25 to 28 days, it can be on the cluster cocoon. Silkworms grow and develop to a certain point when they have to take off the old skin and grow new skin. During the period of shedding the skin, it does not eat and does not move, which is called sleep. Between sleep and sleep is called age.

Generally, the age of one to the age of three called the small silkworm period, the age of four to the age of five called the large silkworm period.

The first age: from hatching to the first shedding of skin, called the first age. The sleep period is called the first sleep. Age after three to three and a half days. At the beginning of the silkworm body is small, full of bristles, body color black and brown like ants, so it is called ant silkworm.

The second age: after the first shedding of skin to the second shedding of skin before the second age, sleep period is called the second sleep. The age period is about three days. The second age is shorter than the other ages.

Third age: from the second shedding of skin to the third shedding of skin, called the third age. The sleep period is called third sleep. Age after about four to four and a half days. At this time the spots on the body of the silkworm can be recognized.

The fourth age: from the third time after the skin to the fourth time before the skin is called the fourth age. Sleep period is called four sleep. Commonly known as the big sleep. Age after about five to six days, the silkworm body mottled more clearly.

Fifth age: from the fourth peeling to the cluster, called the fifth age, after about 7 to 8 days. Silkworm body fat, mottled clear, from the ant silkworm to the fifth age of the full-feeding period, the weight increased by about 10,000 times.

Three, the age of the development of the period of distinction: silkworms in the same age of the development process, due to the degree of appetite, body color and other changes, can be divided into five periods, a correct grasp of these five periods, for a reasonable to the mulberry and sleep up processing is very helpful.

Small eating period: after the silkworm peeling, commonly known as the beginning of the silkworm, the skin, the mouthparts are very tender and soft, need to go through some time, before starting to eat mulberry. In the first day after peeling off the skin, the silkworms eat less mulberry, so it is called the period of less food.

Mid-feeding period: the color of the body gradually turns green, the body is slender, the folds on the skin unfold, and the amount of mulberry eaten is between the low-feeding period and the full-feeding period.

The amount of mulberry given during the period of low and middle feeding should be controlled appropriately.

Maximum feeding period: the color of the body is greenish-white and glossy, gradually turning from green to white. Appetite is strong, eating mulberry for a longer period of time, growth has reached the maximum of this age.

Hypnophagous stage: body color changes from greenish white to fried rice color (yellowish in white), skin is taut and shiny. Appetite decreases, spit out the silk, and gradually sleep, which is called the sleep silkworm. Five years after the full-feeding period called ripening silkworms.

The last feeding of silkworms before sleep is called "stop mulberry", also called "stop eating". Sleep up after the fourth feed silkworms called "pay food". From the rate of food to stop eating is called "food in the mulberry". From the stop eating to pay for food is called "stop eating period", also called "sleep", from the silkworm hatching to cocoon is called the full age through.

Silkworm technology

One, spray mulberry leaves used to add food for silkworms: a city catty of water with 5 ml of fermentation solution, spray 10 city catty of mulberry leaves to add food, once a day. Silkworms love to eat, feces do not stink, fast growth, cocoon thick, good quality, can increase production by about 10%.

Two, spraying silkworm body cooling heat: high summer temperatures, silkworms are prone to disease, room temperature is too high silkworms are also prone to heat stroke death. Can be in the hot weather, according to a catty of water plus 5 ml of fermentation solution, sprayed on the silkworms, every day in the afternoon, spray once.

Three, spray mulberry leaves to preserve freshness: high summer temperatures, picking mulberry leaves stacked for a long time will be yellow and deteriorate, the fall climate is dry, picking mulberry leaves, stay a long time will be dried up and hardened, according to a catty of water plus 5 ml of fermentation solution, used to spray mulberry leaves wet, and then the mulberry leaves into a woven bag or piled up on the ground, with a plastic cover, save 24 hours is still fresh and green as the beginning.

Four, spray mulberry leaves to promote growth: one pound of water plus 1-2 ml of fermentation solution, spray mulberry leaves in the mulberry field, spray 2-3 times a month, add 0, 2% of potassium dihydrogen phosphate is more effective. Spray to the mulberry leaves all wet not dripping appropriate. Mulberry leaves grow fast, the leaves are green and fat, and the yield can be increased by 20-25%. It can also reduce pests and diseases.

Note: In the use of vitality 99 fermentation liquid before and after 6 hours can not use antimicrobial agents, fermentation liquid regardless of how long to save, as long as there is a sweet and mellow currant smell, can be used, if the odor is not to be used.