The silkworm will stop eating and will not move, and its body will have black spots.

Before they die, silkworms will stop eating and will not move, and their body color will gradually turn yellow or black spots will appear. After death, the body of the silkworm will gradually dry out and flatten, and shrink in size. If the silkworm is sick, the body may rise, and pus may appear where the silkworm has crawled.

Silkworms are native to China, distributed in temperate, subtropical and tropical areas. It is a fully metamorphic insect, the life of the egg, larva, pupa, adult four morphologically and functionally completely different stages of development. Silkworm is a thermophile, the temperature directly affects physiological activities; small silkworms warm and humid, large silkworms dry, air circulation, silkworms to daytime and nighttime darkness is appropriate; mulberry leaves is the most economically viable feed for silkworms.

The process of the silkworm baby cocoon

1, mature silkworms will first spit out the silk, and then bonded to it on the nest, and then spit out the silk connected to the surrounding support, and gradually formed a cocoon network. Cocoon network does not have a cocoon shape, just some loose and messy cocoon silk layer to serve as a cocoon support.

2, knotting the cocoon coat knotting cocoon net, continue to spit out the messy silk circle, thickening the inner layer of the cocoon net, spitting way to bend, spitting cocoon knotting cocoon, began to appear cocoon outline, cocoon coat of the silk is thin and brittle, irregular arrangement, the silk content of gelatin is also more.

3, the silkworm will spit out of the silk row into a neat "8" shaped silk circle, every weaving more than 20 silk circle (called a silk column) will move the body, and then continue to spit silk weaving the following silk column, weave a good head and then weave the other end.

4. Finally, because of the large number of silk spitting, resulting in a greatly reduced body, the head and chest will slow down the swing speed, resulting in a loss of rhythm, spitting will begin to look messy, the formation of loose and soft cocoon layer, which is known as the chrysalis lining.