Cocoon formation is not just a patent for silkworms. As long as it is a completely abnormal insect, it can form a bag-like protection at the pupal stage. It is usually woven from silk secreted by silk glands, such as cocoons of silkworm and castor silkworm. The cocoons of Eupolyphaga sinensis and Eupolyphaga sinensis are made of soil, the cocoons of scarab are made of secreted mucus and soil, and the cocoons of Hymenoptera are made of secreted calcium.
brief introduction
When dealing with silkworm cocoon formation, Jiaxing and Huzhou are the best methods. In other places, I don't know how to bake with fire to dehumidify, but let silkworms spin silk casually and form cocoons everywhere, which sometimes leads to cocoons knotting in stalks or boxes, which is airtight.
Therefore, the silk woven by Tunxi and Zhangzhou, and the silk woven by Henan and Sichuan are easy to rot. If the silk made in Jiaxing and Huzhou is used as clothes, even if it is washed 100 times or more, the quality of the silk is still intact.
Jiaxing and Huzhou cut bamboo sticks into silkworm foil, put wood under the silkworm foil, put a wooden shelf about six feet above the ground, put charcoal fire on the ground (note that explosive charcoal is not allowed here), and put a brazier every four or five feet. When silkworms start to cocoon up the mountain, their firepower is slightly less. Because silkworms like warmth, they are induced to cocoon immediately and stop crawling around.