Recently, it was hot and rainy, and white beetle frequently occurred, which became the “invisible killer†of silkworm cocoon production in our province. Experts called for silkworm farmers around the country to take effective measures as soon as possible to avoid losses. First, the incidence of the law 1, the source of infection White beetle is parasitized in the silkworm body caused by Beauveria bassiana. Diseased cocoon moths and insect feces form a large number of conidia, which are brought into the silkworm by contaminating the mulberry leaves and become a source of infection for the silkworms. When Beauveria bassiana was transmitted through conidia, it had the highest incidence rate in Guangdong from April to June or even July. 2, the pathogenesis of conidium attachment to the silkworm body wall, in the appropriate temperature and humidity conditions, water swelling, about 6-8 hours to germinate, invade the silkworm blood cavity parasitic and absorb a large number of silkworm water and nutrients until silkworm Die. Before silkworms die, hyphae generally do not invade other silkworm tissues and organs. The mortality of white silkworm disease from infection to morbidity is different due to strain virulence. Under normal circumstances, the 1-2 age is 2-3 days, 3rd instar 3-4 days, 4th instar 4-5 days, 5th instar 5-6 days. II. Prevention and control measures 1. The disinfection of silkworm silkworms with bedpans shall be carried out with the disinfection of silkworm silkworms, beddings, etc. (ie, immediately after the last batch of silkworms is disinfected with a disinfectant liquid, and then rinsed with water, and then Disinfection with a disinfectant solution. Disinfectant volume is prepared according to the disinfected area. The solution is ready for use. Disinfection should be done 2-3 days in advance. 2. Sulphur smoke, white silkworm disease, serious silkworm room, it is recommended that the liquid after 30 minutes to 1 hour disinfection, that is, before the room has not dried before smoked with sulfur 1 time. Under normal circumstances, smoking can be performed once a year before the start of construction. The specific method is: Put 15 grams of sulphur per cubic meter of silkworm in sulphur pots or tile pots, place the fire until the sulphur is melted, move away from the fire, and throw a match into the molten sulphur. Ignited, issued a blue flame, sealed fumes one night. After the sulphur fumigation, the silkworm room should open the doors and windows for ventilation and ventilation. After 2-3 days, the ants can feed silkworms. 3, small silkworm disinfection goose feathers, silkworm chopsticks, silkworm nets and other small silkworm boiled for 20 minutes, then dried in the sun storage and storage, plastic film, cedar board, etc. must also be used clofisol or disinfectant disinfection. 4. When silkworm silkworms were used for disinfection and prevention, all ages were insulted in batches to disinfect silkworm silkworms with lime. When silkworms were used, they were first sprinkled with “silkworm nets†and then sterilized before feeding. As the previous batch of silkworms has been treated with zombies, the silkworm silkworm nest should be disinfected with silkworm nest net for 1 time. In the case of zombies, silkworm silkworms should be disinfected once a day with silkworm nets until silkworms no longer appear. When the above silkworm silkworms are sterilized, they should be carried out in the morning and at night. The ants were captured by the hitting method, and silkworm silkworms were sterilized at the same time. The method is: firstly paste the sterilized nylon film on the silkworm nest, one person firmly holds the silkworm seed paper, the egg surface and the ant silkworm are facing the nylon film, and the other person uses the silkworm chopsticks on the back of the silkworm paper to make a strong impression. 3, all the ant silkworms fall down, and then the right amount of "silkworm nest net" is screened on the ant silkworm, and the mulberry leaves are evenly distributed after 10 minutes. 5. Timely isolation and elimination of dead silkworms. Found dead silkworms that have died of disease and put them into a disinfection cylinder (disinfectant liquid is placed in the cylinder and buried regularly). Eliminating the latest delaying silkworms and weak silkworms. Pay attention to the operation and minimize the flying of dust. The feeding, mulching, sand removal, and batch operations should be carried out on the shelf. It is forbidden to operate the nest on the ground. 6. If smokers are found to be more severe in the prevention of silkworm disease, they may use loose hair, hay, leaves, sawdust, chaff, etc. (with the best effect of pine hair) as smoking materials, 10-15 grams per cubic meter. The amount of incomplete combustion, the timely closing of doors and windows, as much as possible to make smoke spread out in half an hour, full of silkworm room, keep the smoke out of the air after 1 hour, 1 time per day, you can stop the spread of deadlock (before using ants to use this The method can prevent the occurrence of deadlock by continuously smoking tobacco for several times. 7. Sericulture treatment or operation should be preceded by small silkworm rear silkworm silkworm nets after every sand removal to avoid exposure to moist pathogens. 8, timely removal of dead silkworm sorghum residual mulberry and other used places, utensils, clean up and disinfect in a timely manner, severe disease should be disinfected after cleaning, in order to avoid pathogen spread. 9, eliminate pests, to prevent cross-infection do not use pollution mulberry leaves, such as the need to use, should be 1-2 days in advance with "Ke Wei Ling" agent spray Mulberry, even spraying. 10, to deal with silkworm silkworm disease must be stacked. Digging pits can be covered with mud and can also be covered with nylon film. Before covering, sprinkle the disinfectant on the surface of the silkworm sand. The stack is applied as organic fertilizer after 10 days. 11. Unifiedly clean environmental weeds and conduct thorough disinfection. Third, pay attention: 1, liquid disinfection to disinfect the spirit as well, such as the use of bleach to pay attention to the content of available chlorine. The liquid concentration is 200 ml/m3, ie 20 kg/100 m3. Spray evenly and keep moist for more than half an hour. 2. The silkworm silkworm is sterilized with the net of the compound silkworms as well, and the bleaching powder can also be used to prevent the stagnation powder. The small silkworm uses 2% effective chlorine and fresh lime. The large silkworm uses 3% effective chlorine and fresh lime, but the medicament has hygroscopicity. , unfavorable to the ground. Silkworm silkworm disinfectant powder: requirements of an age of 20 g/m3, second instar 30 g/m3, third instar 40 g/m3, fourth instar 50 g/m3, fifth instar 60 g/m3, That is, there is a thin layer of powder on the silkworm body, which is given to the mulberry after 10 minutes after spreading, and the total dose of each silkworm species is about 3-4 kilograms. 3, expired or disinfected drugs should not be used, do not blindly add drugs, so as not to increase the humidity of silkworm seats.
Toboli International Trading Co., Ltd. , http://www.jnapplefruit.com