How to prevent the occurrence of young silkworm, Vosangyi silkworm and lost silkworm

The cocoon yield is not only related to the single cocoon weight, but also largely depends on the number of seeds, so effective measures should be taken to prevent the occurrence of young silkworms, mulberry silkworms and lost silkworms. The specific measures are as follows:

First, select fine leaves to collect ants and leaves for 1-year-old and 2-year-old silkworms, choose mulberry leaves that are ripe and tender, fresh, and have a moisture content of not less than 75%. Avoid using old and immature leaves, otherwise it is easy to form young silkworms. We should also choose fresh and tender mulberry leaves to feed silkworms during the mid-feeding period and high-eating period.

2. The optimum room temperature and humidity of 1st instar silkworm is 26.7-27.8 ℃, the difference between dry and wet is 0.5 ℃, the room temperature of 3rd instar is 257.26 ℃, the difference between dry and wet is about 1 ℃, the room temperature of 4th instar is 24-25 ℃, the difference between dry and wet is 1-1.5 ℃. Vosangyi silkworm is easy to occur when the temperature is too high, too low, or suddenly high or low, and low temperature and humidity.

Third, the silkworm seat is evenly distributed and properly laid, which can not only promote the individual development, but also make the overall development neat and the silkworm body strong. According to the standard, the area of each silkworm pedestal of the 1st, 2nd, 3rd and 4th instar silkworm eggs should reach 1.1, 2.2, 5 and 5.18 square meters respectively, in order to prevent the silkworm head from being too dense to affect the silkworm eating mulberry. The size of the cut leaves and the amount of mulberry should be appropriate. If the leaf is cut too much, too much mulberry is easy to occur, and eating the residual mulberry will also form a weak silkworm. At the same time, when expanding the seat, we must keep the silkworm seat flat, especially before bedtime, do not upset the silkworm seat, in case the silkworm falls from the gap, and the silkworm is not eaten enough to form young silkworms or mulberry silkworms.

Fourth, after more than 95% of silkworms sleep in batches, coke bran can be used to stop mulberry for a small number of green-headed silkworms, and a net is put forward to raise green heads separately to prevent silkworms from being weak due to starvation.

Fifth, timely pay and food is too early, because it is early and late to nibble on mulberry, it is easy to cause uneven development of silkworm. The edible leaves should be fresh and tender, and the feeding leaves should be uniform to prevent the formation of weak silkworms.

Sixth, photosensitive ventilation to mulberry half an hour before opening the silkworm film (that is, anti-dry paper) for photosensitive ventilation, at the same time do a good job in the replacement of the silkworm plaque, inside and outside, and strive for uniform light. Lights should be turned on on rainy days to prevent the occurrence of mulberry silkworms and lost silkworms.

Seventh, commonly used coke bran lime in the feeding of 1-year-old and 2-year-old silkworms, Panax notoginseng coke bran (that is, three parts of fresh lime and seven parts of coke bran) is often used before mulberry, which not only plays a drying role in wet conditions, but also achieves the purpose of disinfection and disease prevention, at the same time, it can also promote silkworms not to eat residual mulberry leaves and reduce mulberry silkworms.

In addition, sleep removal, removal must be carefully operated to reduce the loss of silkworms. If the silkworm is underdeveloped, the silkworm sand after removal should be temporarily spread out on the ground, and the late-rising silkworms should be induced with silkworm blocks or mulberry leaves and carefully reared separately.