What if silkworms don't cocoon?

In the production of silkworm farmers, the phenomenon that silkworms do not form cocoons occurs from time to time, which brings certain losses to sericulture production. First of all, it is necessary to find out the reason why silkworms do not cocoon, and then take measures to control them. The main reasons are:

1. Pathological factors. Such as purulent disease, malacia is infected before shanghai, it destroys the secretory function of silkworm silk glands, or pathogens produce a large number of toxic metabolites in the silkworm body, so that the nerves of silkworms are paralyzed and cannot be cocooned.

two。 Physiological factors. The silk gland in the middle part is abnormal, mainly because the feeding temperature is too high, the leaf quality is too tender, the secretory gland is out of balance and so on. The second is the abnormality of the anterior silk gland, which is mainly caused by exposure to a large amount of gas, fishy gas, alcohol and other bad gases in the process of feeding.

3. Trace pesticide poisoning. During the period of feeding or shedding, 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 shedding. The silk gland is broken or the temperature is too low, so that the silkworm stops spinning for a long time; the silk is too dense, so that the silkworm can not find the cocooning place, or the silk is not dry and the cocooning environment is improper.

Prevention and control methods:

1. Prevent silkworm disease and strengthen management. It is necessary to strictly disinfect, eliminate pathogens, cut off the route of infection, and do a good job in disinfecting silkworm rooms, silkworm utensils and around silkworm rooms. Use bleaching powder containing 1% available chlorine or 1%-2% fresh lime water supernatant spray disinfection; 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 silkworm house, keep the silkworm house warm and humid, the air fresh and the silkworm seat clean; add chloramphenicol in the strong silkworm period, 1-2 times per age, and should contain 500 units of chloramphenicol per milliliter.

two。 Strictly prevent trace pesticide poisoning. Mulberry leaves contaminated by pesticides should be prevented from being fed, and silkworm rooms, silkworm tools and sericulture supplies should be prevented from being contaminated by pesticides. So that the silkworm room does not pile up pesticides, silkworm tools do not put pesticides, sericulture supplies do not touch pesticides.

3. The operation of lifting should be meticulous. When cooking, it is necessary to achieve "three evenness" and "three dryness". Three evenly, that is, the mature silkworm is evenly mature and not biased; the density of the upper silkworm is uniform and not dense; and the ripe upper silkworm is uniform and not too old. Third, dry, that is, the room equipment, the environment is dry.