Key points of Disease Control techniques for Silkworm, Bombyx mori

In the process of rearing silkworms, the occurrence of silkworm disease is closely related to the physique of larvae, pathogens and environmental conditions. Farmers do not thoroughly disinfect the silkworm rooms and tools used by farmers, extensive management techniques during the rearing period, and poor environmental conditions, which are not conducive to the growth and development of larvae, which can easily lead to the invasion of pathogenic microorganisms, resulting in diseases caused by the physical decline of larvae, resulting in a large number of diseases of larvae, and causing great economic losses to silkworm farmers.

In order to effectively control the occurrence of larval diseases, it is necessary to give priority to control during the period of rearing silkworm larvae, combined with control measures to ensure high quality and high yield. The prevention and control measures must be done in the following aspects.

1 thoroughly disinfect and eliminate the source of infectious diseases

1.1 cleaning hygiene

Before sericulture, the use places and silkworm tools should be thoroughly cleaned and cleaned, and the indoor and outdoor diseased silkworm corpses and silkworm sand, the residual cocoon silk and weed garbage on sericulture equipment should be thoroughly removed. The ground should be washed with clean water in order to improve the disinfection effect of the medicine.

1.2 eliminate the source of the disease

Eliminating the source of disease is an important measure for the comprehensive control of silkworm rearing to prevent the disease of larvae, and the source of disease is the main source of disease with serious harm in production. Therefore, it is necessary to thoroughly disinfect sericulture utensils and surrounding environment and eliminate the source of disease. Ensure the safety of sericulture.

1.3 disinfection of silkworm rooms

After the sericulture room is cleaned, the ground is washed with clean water, then the floor, walls and roof are sprayed with bleach, and finally the doors and windows are closed and fumigated with poison.

1.4 disinfection of silkworm utensils

After washing silkworm utensils, use bleach solution for disinfection, the medicament should be accurate, and the spray solution should be uniform. After disinfection, the silkworm tools are placed outdoors and exposed to the sun.

1.5 eliminate weak silkworms

In the process of feeding, it is necessary to strictly promote and batch, eliminate late-sleeping silkworms and young silkworms or raise them separately, ensure the neat growth and development of population larvae, minimize mixed rearing of silkworms, and prevent infection of silkworm disease, which is also an important measure to prevent the occurrence of silkworm disease.

1.6 Silkworm period disinfection

Before collecting ants and before feeding, the larvae should be disinfected with silkworm pedestal disinfectant respectively when they are sleeping and when they are ripe, so as to protect the larvae from the virus. In the process of feeding, an appropriate amount of quicklime should be used for silkworm body and silkworm seat disinfection.

2 to strengthen hygiene and epidemic prevention to keep the silkworm room clean

2.1 the silkworm room should be clean

To keep the sericulture room clean and hygienic, clean the residual leaves and silkworm sand that fell to the ground after mulberry, and reduce the flying dust as much as possible when cleaning.

2.2 Storage mulberry should be anti-virus

Mulberry storage places should be kept clean and sanitary, disinfection of mulberry storage rooms should be done regularly, and at the same time, the virus should be prevented from being brought into mulberry storage rooms.

2.3 wash hands for Sang

In order to prevent germs from coming into contact with larvae and mulberry leaves, workers should wash their hands before giving mulberry to ensure that the larvae eat leaves safely.

2.4 cleaning up silkworm sand

The silkworm sand should be removed in time, and the silkworm sand should be centrally piled away from the sericulture room. After sand removal, the ground was disinfected with 0.3% available chlorine bleach and 1% lime paste.

2.5 treatment of silkworm disease

The eliminated weak silkworms and diseased silkworms should not be discarded casually, but should be centrally disinfected every day, and then buried deep in the ground as fertilizer.

2.6 add food to prevent disease

During the feeding period, in addition to using lime and silkworm seat net to disinfect the silkworm room, silkworm tools, silkworm body and silkworm seat, chloramphenicol should be used at the same time to control bacterial silkworm disease. Chloramphenicol must be added once at age 2 and twice at age 5.

(3) eliminating insect pests in mulberry garden to ensure the safety of larvae eating leaves.

3.1 catching and killing insect pests

Catching and killing mulberry pests is an important measure to ensure safe production; therefore, it is necessary to catch and kill mulberry pests in time to prevent pests from eating mulberry leaves to spread silkworm larval diseases.

3.2 Drug treatment

When there are more insect pests in mulberry orchards and the mulberry leaves are heavily polluted, 0.2%-0.3% available chlorine bleaching powder can be used to spray foliar disinfection.

(4) strengthening technical management to improve cocoon quality

4.1 good leaves are full of food

In the process of feeding, excellent mulberry leaves should be selected for mulberry according to different instar stages of the larvae, so as to ensure that the larvae are full of good leaves, enhance their physique and obtain excellent cocoon quality.

4.2 High temperature protection

The high temperature environment in the young silkworm stage is disadvantageous to the growth and development, so it is necessary to do 3 sparse in the sericulture room, that is, sparse silkworm frame, thin silkworm plaque and sparse silkworm head. Do not close the doors and windows of the silkworm room and keep the room well ventilated. When you encounter high temperature, spray clean water to the floor and walls to cool down.

4.3 suitable temperature for feeding

The optimum temperature for 1-year-old, 2-year-old, 3-year-old, 4-year-old, 5-year-old and 5-year-old were 26 ℃, 26 ℃, 24 ℃, 2 ℃, 22 ℃ and 4 ℃ respectively. The indoor temperature in the big silkworm period should not be lower than 24 ℃. When the temperature is less than 24 ℃, close the doors and windows to increase the temperature, and pay attention to ventilation.

4.4 Prevention of hunger

Summer sericulture is in the high temperature season, mulberry leaves dry quickly, easy to lose water, larvae do not like to eat, will lead to larval hunger. In order to maintain the moisture of the leaves, the 1st and 2nd instar plaques should be covered with anti-dry paper and covered with plastic film, and the 3rd instar larvae should only be covered with plastic film. After entering the dormant period, the larvae should remove the upper film to ensure that the larvae eat leaves normally and are not hungry.

4.5 Preservation of mulberry leaves

The recovered mulberry leaves should be preserved in a humid environment to make them fresh and moist. If mulberry leaves wilt seriously, spray clean water half an hour before feeding leaves and feed them with moist leaves.

4.6 Prevention of poisoning

In order to prevent larval pesticide poisoning, people who have been exposed to pesticides and tools carrying pesticides should be prohibited from entering the sericulture room to avoid larval pesticide poisoning.