Detailed Explanation of Key Technical Points for Rearing Large Silkworms in Autumn

The main reason for the instability of autumn silkworm production is the damage caused by silkworm diseases. As the number of @#@250@#@ increases, the number of pathogens increases, the spread area expands, and the viruses are fresh and multiply quickly, resulting in a high disease rate. After repeated use of silkworm rooms and silkworm tools, if disinfection is not thorough and rearing management is relaxed, combined with the harsh environment of high temperature and high humidity or high temperature and dryness in autumn, as well as the poor quality of mulberry leaves, the silkworms have weak disease resistance, all of which are the main reasons for the easy outbreak of silkworm diseases during the large silkworm stage in autumn.

1. Strengthen disinfection and disease prevention, eliminate pathogens

The effective measure to prevent silkworm diseases is disinfection, eliminating opportunities for pathogen infection. When silkworm diseases occur, the pathogen source must be immediately isolated, with more lime or dry materials scattered, and the frequency of removing excrement increased. If it is a viral silkworm disease, disinfecting the silkworm seat with fresh lime powder every day can reduce infection in the silkworm seat. If it is a bacterial silkworm disease, chloramphenicol can be added to the feed. If it is a muscardine disease, disease-preventing powder can be used to disinfect the silkworm body. If it is @#@261@#@ disease, "Mie Can Ying" can be used to spray the silkworm body or add to the feed. When using chemicals, standards and methods must be strictly mastered.

2. Spread sparsely and feed to satiation, prevent hunger

During the large silkworm stage, it is required to grasp the "three sparses" well, namely, the silkworm stands in the silkworm room should be placed sparsely, the silkworm trays on the silkworm stands should be placed sparsely, and the silkworm heads in the silkworm trays should be placed sparsely. In autumn, the temperature is high and dry, so clean water can be sprayed on mulberry leaves. But when the silkworms are about to molt or mature, and at night, do not feed wet leaves. Feeding wet leaves should be to the extent that the leaf surface is moist but not dripping. And strengthen ventilation and air exchange. Among silkworm farmers, there is the experience that "autumn silkworms rely on wind for rearing." If there is no wind outdoors, fans can be used to make the air circulate. Pay attention to supplementary feeding of mulberry, especially during the peak feeding period, supplement mulberry once between two feedings, so that good mulberry leaves are fed to satiation.

3. Strengthen molt and emergence management, strictly pick green and batch

In autumn, mulberry leaves are uneven in old and tender, making it easy for molting and emergence to be uneven. When there are unhealthy silkworms, uneven molting and emergence are also likely to occur. If molting and emergence are uneven, it is necessary to pick green and batch, and eliminate the unhealthy late-molting silkworms and small silkworms.