Causes and control of Bombyx mori Beauveria bassiana

Beauveria bassiana is caused by Beauveria bassiana invading silkworm through skin. The route of infection is contact infection, the silkworm is soft and then hard after death, and the whole body is covered with white conidia, which is called "Beauveria bassiana". Beauveria bassiana likes to be wet and afraid of dryness, and silkworms are prone to disease in wet places and rainy seasons; if the work of detoxification and disease prevention is neglected in silkworm period, it will cause the epidemic of Beauveria bassiana.

The causes of Bombyx mori Beauveria bassiana

The silkworm chamber and silkworm utensils co-reared with young silkworms in ① were not thoroughly disinfected according to the prescribed standards, and there were a lot of Beauveria bassiana residues.

There is no special silkworm room for raising large and small silkworms in ②, small silkworms are raised in houses, silkworms are raised outside, or silkworms are raised in front and back houses, which leads to the spread of Beauveria bassiana to young silkworms.

The disease and dead silkworm caused by Beauveria bassiana in ③ were not treated centrally, which expanded the spread of Beauveria bassiana.

The indoor humidity of ④ silkworm is high, and the times of removing silkworm sand is less.

⑤ silkworm room, silkworm tools disinfection less, silkworm body, silkworm seat less medicine.

⑥ despises the work of pest control in mulberry garden, the density of Lepidoptera pests in mulberry garden is high, and the occurrence of Beauveria bassiana pollutes the taste of mulberry and the surrounding environment, causing silkworm infection.

Control of Beauveria bassiana in silkworm, Bombyx mori

① strictly implements the breeding system of "special room, special equipment, special use, small silkworm room far away from big silkworm room".

The ② silkworm room, silkworm utensils and the surrounding environment should be strictly disinfected according to the standard, and can be fully sprayed with bleaching powder containing 1% available chlorine or 1000 times solution of Fangzhiling 2.

③ economic use of anti-ossification agents for silkworm body, silkworm seat disinfection, each age of silkworm should be disinfected with anti-stiff powder. After the occurrence of muscardine, the big silkworm was sprayed with 1500 times of water agent for 3 consecutive days, and then sprayed once every other day, which could control the spread of Beauveria bassiana.

④ diseased silkworms and dead silkworms should be picked up in time, put into disinfection tank and burned, must not be thrown at random, can not be collected and dried for sale, silkworm sand should be concentrated for retting, and must not be thrown at random.

⑤ smokes with wood chips, hay and other smoking materials, closes the doors and windows, and then opens the doors and windows an hour later to exhaust smoke, once a day, which can prevent the occurrence and spread of Beauveria bassiana.

⑥ adjusts the humidity in the silkworm room, and when the humidity is high in cloudy and rainy days, you can sprinkle more dry materials such as lime and coke chaff; remove silkworm sand frequently and keep the silkworm room clean and hygienic.

⑦ often carries out pest control in mulberry garden to control the population density of insects in the field and prevent cross-infection.

After the end of ⑧ @ 250, silkworm utensils, silkworm clusters and silkworms should be thoroughly and thoroughly disinfected with bleach containing 1% available chlorine, leaving no dead corners.