Prevention and control methods of silkworm without cocooning

First, the reasons why silkworms do not cocoon:

1. Pathological factors. For example, purulence and malacia are easy to be infected before the upper cluster, which destroys the secretory function of the silk gland of the silkworm, or the pathogen produces a large number of toxic metabolites in the silkworm, which paralyzes the nerves of the silkworm and cannot spin cocoons.

2. Physiological factors. The first is the abnormality of the central silk gland, mainly because the feeding temperature is too high or too low, the leaf quality is too tender, the secretory gland is maladjusted, and the silk gland is abnormal, and the second is the abnormality of the anterior silk gland. it is mainly caused by excessive exposure to bad gases such as gas, fishy gas and alcohol in the process of feeding.

3. Trace pesticide poisoning. During the period of feeding or clustering, ingestion or contact with trace pesticides caused the imbalance of endocrine glands in the silkworm body, but could not spin silk.

4. Improper operation of the upper cluster. The extensive operation of the upper cluster leads to the rupture of the silk gland, or the temperature in the cluster is too low, the cluster is not clean, the upper cluster is too dense, the upper cluster environment is poor, and other reasons make the silkworm stop spinning for a long time without cocooning.

Second, prevention and control methods:

1. Prevent silkworm disease and strengthen management. First, it is necessary to strictly control disinfection, eliminate pathogens, cut off the route of infection, and do a good job in disinfection of silkworm rooms, silkworm utensils and around silkworm rooms. 1% available chlorine bleaching powder or 1%-2% fresh limewater clarification solution can be used for spray disinfection; the second is to strengthen feeding management and enhance the resistance of silkworm. Select silkworm eggs with strong disease resistance to avoid the effect of muggy weather in summer and autumn on the growth of silkworm, keep the silkworm house warm and humid, the air fresh and the silkworm seat clean. Chloramphenicol should be added to the silkworm during the strong silkworm period, once or twice per age, containing 500 units of chloramphenicol per milliliter.

2. Strictly prevent trace pesticide poisoning. It is necessary to prevent feeding mulberry leaves contaminated with pesticides (try to feed mulberry every time), prevent silkworm rooms, silkworm tools and supplies from being contaminated by pesticides, so that silkworm rooms do not pile up pesticides, silkworm tools do not put pesticides, sericulture supplies do not come into contact with pesticides.

3. The operation of the cluster should be meticulous. It is necessary to achieve "three evenness" and "three dryness" on the cluster. Three evenly, that is, the mature silkworm is evenly mature, not biased; the upper cluster density is uniform, not dense; the upper cluster is mature evenly, not too old. Three dryness, that is, cluster room, cluster tools, dry environment.