1. Open leaves and pay food at the right time to ensure uniform development. The leaves are opened only when all the silkworms shed their skins, and the sleeping silkworms cannot be seen and the silkworms are crawling around for food. Have to wait and press. Because of the uneven hatching of spring silkworms when harvesting ants, they must be regulated during the three-sleep stage to ensure uniform development to facilitate future feeding and management.
2. Handle the relationship between heating and ventilation and ventilation. The temperature of the fourth instar period should be kept at about 24-25 degrees Celsius, and the difference between dry and wet is 1.5-2 degrees Celsius. When the temperature is still lower than the requirements for sericulture, when the target temperature is required to continue to adjust the temperature, the film fence should be removed, and the doors and windows should be closed. For the plastic film used, when the indoor temperature in the fourth age is lower than the target temperature, "doors and fires" must be implemented. If the natural temperature is used, the doors and windows must be opened for ventilation. During the day, the doors and windows must be opened for ventilation, and the doors and windows can be closed at night for proper heat preservation. Promote cannibalization of mulberry. Never close doors and windows tightly because of heat preservation. In the end, the sultry heat can easily lead to the decline of Caner’s resistance and induce pus.
3. Reasonably allocate spring silkworm leaves. For fourth-instar silkworms, you should choose a leaf below the top of the new shoot. The lower leaf should be roughly cut. From now on, we will use the headless three-eyed leaf at the bottom of the technical strip to give the mulberry a little more leaves. Caner is full of food. Mulberry leaves can only be stored with damp cloth, not film, and cannot be stored in the sericulture room, or in other rooms where sundries are piled. Generally, the fourth-instar mulberry leaves should be stored in a special room to prevent the mulberry leaves from drying out and causing heat, deterioration and pollution. Silkworm disease occurs.
4. Do a good job of sand removal in time. In the fourth instar, the removal cannot be less than twice to prevent the silkworm excrement from accumulating too thick and causing the infection of silkworm disease.
5. Strengthen disease prevention and disinfection. Persist in opening the leaves, sleeping and each time before giving it to the mulberry, use anti-stiffening powder and fresh lime powder to disinfect the body and seat of the silkworm. The disinfectant powder must be spread evenly, like a thin frost. Feed the mulberry after 20 minutes each time the silkworm body is disinfected to increase the space for killing germs. And do a good job of adding food ********* once during the leaf opening and full feeding period, and once in the middle of the fourth instar to kill silkworm flies to prevent the occurrence of myiasis.
6. Intensify anti-virus security. When using the middle-lower tri-eye leaves, each silkworm farmer should not only prevent the mulberry garden from not passing the residual poisoning period, but also prevent the middle-lower leaves from the pest control in the vegetable and three-wheat farms. In addition, some farmers have used pesticides to soak seeds in violation of regulations in recent days for soaking rice seeds and raising seedlings. Due to the high wind force these days and the low temperature in the silkworm house of some silkworm farmers, the silkworms eat slowly and their resistance has declined, showing abnormal poisoning. Therefore, When treating insects in the vicinity of silkworm houses and mulberry fields, farmers should not use foggers, but also check the wind direction to treat insects. When applying medicine, they must notify silkworm farmers to close doors and windows in advance. Poultry farmers cannot use pesticides containing pesticides in the silkworm house or around the mulberry orchard. Poultry houses prohibit the use of pesticides containing pyrethroids or organic nitrogen. Forest pest control should avoid the silkworm stage. Before feeding the silkworms with the middle and lower three-eyed leaves and the suspected mulberry leaves, each silkworm breeder must conduct trial feeding to ensure the safety of the silkworms and reduce the occurrence of poisoning.
The fourth instar period is the key period to control the incidence of silkworms and the yield of cocoons. Large silkworms are infected, transmitted and spread during the fourth instar stage. The rearing of fourth-instar silkworms is not simply a matter of feeding some mulberry leaves, but it must be paid attention and carefully.
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