There are seasonal restrictions on the sale of silkworm chrysalis, which can only be sold between 10 and March every year. When there is a cold storage, in April every year, when the temperature rises, put the cocoon-covered silkworm chrysalis into the cold storage and control the temperature (about MINUS 2 or 3 degrees Celsius), so that the silkworm chrysalis can survive for more than three months.

The price of silkworm chrysalis in summer is twice as high as that in winter, and the cost can be recovered in a few months.

In recent years, the price of cocoon shell began to rise, and the cocoon shell cut by knife can also be used. Cocoon shells can be sold for more than 30 yuan a catty after processing, and most of them are processed into silk quilts. The price of live silkworm chrysalis is about six yuan a catty.

Silkworm pupa, also called bee, is a high-protein nutrient. Late silkworm excrement (silkworm excrement), silkworm chrysalis, cocoon, Beauveria bassiana (silkworm infected with Beauveria bassiana and dying), etc. , are used as medicine.

Silkworms will become pupae after spinning and cocooning for about 4 days. Silkworm pupa is shaped like a rotating pestle, which is divided into three parts: chest and abdomen. The head is small, with compound eyes and tentacles; The chest has chest feet and wings; The bulging abdomen has nine nodes. The color is brown. Professional workers can distinguish men and women from the lines and brown spots on the abdomen of silkworm chrysalis. When the silkworm chrysalis is just pupated, its body color is light yellow, the pupa is tender and soft, and it will gradually turn yellow, brown or brown, and the pupa skin will become hard. After about 12 to 15 days, when the pupa body becomes soft again and the pupa skin is a little shriveled and brown cocoon color, it will become a moth. Silkworm pupae can be eaten to supplement nutrition.