First, the cause of silkworm not scab:
1, pathological factors. For example, pyogenic disease and softening disease are easy to be infected before epistasis, it destroys the silk gland secretory function of silkworm, or the pathogen produces a large number of toxic metabolites in the silkworm body, making the nerve paralysis of silkworms, and not cocooning;
2, physiological factors. The first is the abnormal silk glands in the middle of the country, which are mainly due to high or low feeding temperature, excessive leaf tenderness, abnormal silk glands caused by disorders in secretory glands, etc., and silk silk abnormalities, followed by anterior silk gland abnormalities, mainly due to contact during breeding. Excess gas, fish helium, alcohol and other undesirable gases cause spit disorder;
3, trace pesticide poisoning. During the rearing period or feeding period, the silkworm eats or touches the trace amount of pesticides and causes silkworm glands to be disordered in the body, but it cannot be spit.
4, improper operation of the cluster. The cluster operation is extensive, resulting in the silk glands breaking, or the temperature in the cluster is too low, the clusters are not clean, the clusters are too dense, the cluster environment is poor, etc., and the silkworms stop spinning for a long time without scarring.
Second, control methods:
1. Prevent silkworm disease and strengthen management. The first is to strictly control the disinfection, eliminate pathogens, cut off the infection routes, and do a good job of disinfection around the silkworm, silkworm, and silkworm. Can be used 1% chlorine bleach solution or 1% to 2% fresh lime water clarifier spray disinfection; Second, we must strengthen feeding and management, enhance silkworm body resistance. The silkworm strains with strong disease resistance were selected to avoid the influence of hot and humid weather in summer and autumn on the growth of silkworm, so as to keep the silkworm house suitable for temperature and humidity, fresh air, and clean silkworms. Adding chloramphenicol to silkworms at the age of 1 to 2 times per year should contain 500 units of chloramphenicol per ml;
2, prevent pesticide poisoning. It is necessary to prevent feeding of pesticide-contaminated mulberry leaves (to do test feeding before each time) to prevent silkworm, silkworm and sericulture supplies from being contaminated by pesticides, so that silkworm plots will not piling up pesticides, and silkworms will not contain pesticides. Sericulture supplies are not exposed to pesticides;
3, the cluster operation should be detailed. On the cluster, it is necessary to "triplely mix" and "three dry." Sanyun is mature and well-proportioned, and is not partial to life; the density of the upper clusters is uniform and not dense; the old clusters are uniform and old and not old. Three dry clusters, clusters, and the environment are dry.
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