Silkworm black tail disease is caused by Fusarium spp. infecting silkworm body. The spores of pathogenic Fusarium spp. are abundant in air and on mulberry leaves. Under the condition of high temperature and humidity, spores of Fusarium spp. Breeding, especially in the communal breeding room, neglects the ventilation and ventilation, the distance between cocoon and cocoon is too small, and when the cocoon is too thick, it is more likely to lead to the occurrence and spread of black-tailed silkworm disease.
Incidence characteristics. After the onset of silkworm disease, the amount of mulberry fruits gradually decreased, and some silkworms were stuck under the silkworms. Most of the diseased silkworms have anal excretion and black tail ulceration. The hindgut has indurated fecal matter. Some diseased silkworms discharge conchoidal feces or stick to the anus. The disease in sleep is mostly non-peeling silkworm. Both the size of the disease and the silkworm stage occurred, and the disease duration was longer. The death of the silkworm occurred 5-7 days after onset. When the small silkworm died at the beginning of the death, the soft silkworm died. When the silkworm dies, it vomits water. After death, the body skin is not easy to break. After 2-3 days of death, the body is shortened and sharpened, and there are still black lump in the tail. When the fifth instar larvae were lightly affected, although there were dark spots on the tail, they were still able to bear thin leeches. When the disease was heavy, larvae were often dead. Control methods
Disinfect thoroughly. Before silkworm rearing, silkworms and silkworms were sterilized according to standards. The 1% bleach solution can be used to spray silkworms and silkworms, and kept moist for 30 minutes. After disinfection, the silkworm room should be opened for ventilation, and the silkworm should be exposed to sunlight. At the same time strengthen the mulberry garden pest control work to prevent the mulberry field pests infected with Fusarium caused mulberry leaves and the surrounding environment.
Use antifreeze agents rationally. Silkworms, silkworms, and silkworms were sterilized once from each age, from silkworms, in middle ages, and before sleeping, and once every day when diseased silkworms were found. When the disease is severe, the use of smoked tobacco disinfectants to disinfect the silkworms and silkworms can prevent the spread of black tail disease.
Adjust the feeding temperature and humidity. High temperature and humidity are favorable to the growth and reproduction of Fusarium spores. The appropriate temperature and humidity should be selected according to the development degree of the silkworm during silkworm stage. The general silkworm stage temperature should be controlled at 25 °C -28 °C, dry-wet difference 0.5 °C -1.5 °C; silkworm period temperature control at 23 °C -25 °C, dry and wet difference of 3 °C -4 °C. At the same time, we must pay attention to the health of silkworms, dry materials on silkworms, and diligently eliminate silkworm excrement in order to prevent the silkworm sand from being too thick and causing fermentation.
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