Pre-disinfection of silkworms is very important.

Disinfection before sericulture is an important guarantee and key link for sericulture. The silkworm rooms, silkworm tools and environment used for sericulture must be completely and thoroughly disinfected before sericulture every season, in order to kill pathogenic microorganisms, cut off the source of infection, and reduce the amount of microbial pathogens existing in the environment of sericulture to the extent that silkworm disease does not occur, so as to control the occurrence of silkworm disease from the source to ensure disease-free and high yield.

1 the range of disinfection before silkworm

The scope of pre-disinfection of silkworms includes: mulberry tools, silkworm tools, mulberry leaves, silkworm rooms and their environment, including feeding room, mulberry storage room, operation room, greening room, ant collection room, upper mulberry room, hospital dam and so on.

2 preparation before disinfection

2.1 Clean the silkworm room, silkworm tools and surrounding environment first clean the environment around the silkworm room, eliminate garbage, remove weeds, dredge the Yang ditch, remove sewage debris, and scrape off the topsoil around which silkworm sand has been piled up.

2.2 calculate the area and volume of silkworm chamber and the dosage of mulberry leaves and silkworm utensils. The correct calculation of the total area and volume of the silkworm chamber with or without canopy, so as to correctly prepare and calculate the dosage.

3 sequence and steps of disinfection of silkworm utensils in silkworm rooms

Silkworm tools removed from → silkworm room, cleaned → burned garbage → silkworm room, washed → silkworm tools, sun-dried → silkworm tools, soaked disinfected → silkworm tools, disinfected → environment disinfection → silkworm room. In the specific operation, we should do "one sweep, two washing, three scraping, four brushes, five elimination, six drying".

Cleaning: clean indoor and outdoor, centralized destruction of garbage, so that the pathogen is reduced.

Rinse: rinse the silkworm room, silkworm tools and surrounding environment with clean water, so that the pathogen is fully exposed.

Scraping: the silkworm room mud and surrounding land is scraped off the epidermis and concentrated to compost.

Brush: paint inside and outside the wall with 20% fresh lime paste.

Elimination: disinfect silkworm rooms and silkworm utensils with 1% bleach clarification solution.

Sun: after all the sericulture equipment is exposed in the sun, put it back on the silkworm rack and set aside.

4 physical disinfection

Physical disinfection: first, sunlight disinfection; second, boiling disinfection. Sunlight disinfection must go through many times of exposure, internal and external exposure, in order to achieve auxiliary disinfection effect. Steam disinfection requires the stove water temperature of more than 100℃, time of more than 30 minutes, preferably per cubic meter plus 30ml formalin, the effect is better.

5 chemical disinfection

5.1 bleach powder has comprehensive disinfection effect, strong germicidal efficacy, available chlorine 25-30%, and can kill viral diseases, fungal diseases, bacterial diseases and microparticle pathogens. Store in: low temperature, light shelter, dry place.

Usage: prepare an aqueous solution containing 1%, press 225 ml per square meter, and disinfect the silkworm room and silkworm utensils one week before sericulture. After disinfection, the doors and windows must be closed and kept moist for 30 minutes. The disinfected silkworm tools do not need to be washed and can be used after drying.

5.2 formalin formaldehyde has a strong reducing effect and has a strong ability to kill pathogens such as blood-type purulent disease, air disease, rigidity, aspergillosis, microparticle disease and so on. However, the disinfection effect of qualitative polyhedrosis is poor, and 1% fresh lime powder can be added to improve the disinfection effect.

Usage: prepare a mixture of 2% or 0.5% lime with a volume of 225 ml per square meter. Formalin is generally suitable for airtight silkworm rooms, green rooms, upper closet rooms, etc., while rooms that cannot be airtight are not suitable. Must be carefully cleaned before disinfection, the room temperature should be kept at 24 degrees for at least 5 hours, the doors and windows should be closed for one day and night, and can not be used until the smell of the medicine has dissipated.

When using formalin for disinfection, it must be noted that it should be carried out 10 days before sericulture, because its smell is strongly irritating, try to use a gas mask and wet towels to cover the mouth and nose to prevent poisoning accidents.

5.3 Lime paste disinfection just bought fresh disinfectant into 1% disinfectant, stir and disinfect at any time.

Fresh lime disinfection, silkworm room silkworm utensils with a target concentration of 1%, ground and surrounding environment with a concentration of 2-3%, wall painting concentration of 20%. The dosage is 25-30kg in each silkworm room or 50 silkworm foils, keep it moist for more than 30 minutes, and soak the silkworm foils for 30 minutes. Lime paste must be in a turbid state.

5.4 sulfur disinfection according to the volume of 15g per cubic meter, silkworm room silkworm equipment should be moisturized before disinfection. Generally, each silkworm room uses sulfur 1kg, add appropriate amount of cypress branches, close doors and windows to smoke, and wait for the gas to disappear.

5.5 sericulture disinfect the concentration of sericulture by 1-2% and add lime 0.5kg/m2. He Xiwen