Measures to prevent the occurrence of three-sleeping silkworms

At present, most of the silkworms reared in our province are four-molting silkworms. Under normal incubation and rearing conditions, four-molting silkworms should have four molts in one generation. However, if the incubation and rearing conditions are poor, the four-molting silkworm may only have three molts in one generation, resulting in reduced mulberry intake, small cocoon deformation and reduced yield.

The reasons for the occurrence of only three molting of four-molting silkworms are as follows: incubation at low temperature, dryness and darkness of about 20℃; exposure to more than 12 hours of light in one day during the juvenile period; tender mulberry leaves or high protein content in the feed; no heating protection after the silkworm eggs are collected, and they are directly placed at natural temperature for supplementary incubation, resulting in too long supplementary incubation time and low accumulated temperature; long-term exposure to high temperature during the rearing process of silkworms, etc.

To prevent the occurrence of three molting silkworms, the following five points should be done well: (1) must go to the sericulture technology promotion and service department, that is, the main channel to order seeds. (2)Must be supplemented as required. After the silkworm eggs are collected, they should be supplemented at an appropriate temperature, the air should not be too dry, the humidity should be controlled at about 80%, and attention should be paid to dark protection. (3)We must do a good job in organic fertilizer based, organic and inorganic combination of mulberry fertilizer management. Mulberry field partial application of nitrogen fertilizer, easy to make mulberry leaf protein content is too high, silkworm eat this mulberry leaf, easy to appear trimolter silkworm. (4)The quality of good leaves, especially in the process of raising young silkworms, do not feed too tender mulberry leaves, adhere to the feeding of suitable ripe leaves. (5)Avoid long-term contact with high temperature above 30℃ during breeding, and do a good job in heatstroke prevention and cooling in high temperature weather.