Techniques for rearing autumn silkworms

1. The characteristics of autumn silkworm period most of the mulberry cutting patterns in our city are spring fist cutting, with less spring leaves and more autumn leaves, which provides sufficient feed for the rearing of autumn silkworms. At the same time, the temperature was higher in the early stage and lower in the later stage, which was suitable for the physiological requirements of silkworm. Therefore, according to the climatic characteristics of silkworm period, corresponding technical measures should be taken to raise autumn silkworms and improve economic benefits.

2. Autumn silkworm rearing techniques (1) strengthen the management of fertilizer and water in mulberry garden and improve the quality of mulberry leaves: for the management of mulberry garden in autumn, we should focus on applying autumn fertilizer and controlling the fifth generation of mulberry borer, so as to improve the yield and quality of autumn leaves. Specifically, we should do the following work: first, apply 40-50 kg urea and 10 kg potassium chloride per mu before the end of August, combined with mulberry weeding and mixing into the soil, Silkworm farmers with conditions. The mulberry field is covered with pig and sheep garbage or rice straw or chicken and duck garbage to protect the moisture and fertilizer of the mulberry field and make the mulberry grow vigorously. Second, after more than a week of high temperature, sunny and hot weather, mulberry drought relief work should be carried out; third, we should do a good job of mulberry pest control in autumn. (2) strict disinfection and disease prevention: silkworm rooms and silkworm tools must be strictly disinfected to eliminate the source of the disease. The main diseases in autumn silkworm period are pus and Beauveria bassiana. Fresh lime powder has a strong killing effect on pus virus and Beauveria bassiana. In recent years, pus and Beauveria bassiana rarely occur in autumn silkworm rearing, which is directly related to the frequent use of lime powder. The method is to sprinkle fresh lime powder on the silkworm body and silkworm seat in front of the mulberry, and then give the mulberry. Fresh lime powder should also be sprinkled around the silkworm room. (3) the temperature is relatively high during the autumn silkworm period of strict conservation and timely collection of ants, and silkworm eggs should avoid high temperature, sun and rain during transportation. After it is shipped back, it should be put in a spacious and cool silkworm room for protection, do a good job of ventilation, and use natural temperature to promote green. The time of ant collection of autumn silkworm is earlier than that of spring silkworm, and it is generally required to finish ant collection before 9 o'clock in the morning. (4) careful feeding, good leaves eat more Rain Water in autumn, moderate light, better leaf quality, it is necessary to do a good job of mulberry harvesting, mulberry transportation, mulberry storage and so on. The leaves should be picked after the dew dries in the morning and after 4 o'clock in the afternoon, but not at high temperature at noon. According to the weather forecast, we should pick more leaves before it rains to avoid letting silkworms eat water leaves. The collected mulberry leaves should be stored in a low temperature and humid place to prevent fever and air drying. The young silkworms were covered with plastic film and were given mulberry 4 times a day, while the big silkworms were reared 4-5 times a day. Select suitable mature leaves in small silkworm stage, keep mulberry leaves fresh in big silkworm stage, do not feed withered leaves, steamed hot leaves and pest leaves, and do a good job of seat expansion and sand removal in time. (5) adjust temperature and humidity 1. Temperature regulation: autumn silkworms usually collect ants in mid-or late July or early August, and end in mid-August or late August. There is almost no heating in the whole silkworm period, and appropriate warming is needed when the target temperature is not reached in a special year or on a rainy day. 2. Humidity: the whole autumn silkworm period is in a wet state, and moisture drainage is an important work in the autumn silkworm period. It is necessary to remove sand frequently and do a good job of ventilation. Before giving mulberry for the first time every night, evenly sprinkle a layer of raw lime powder on the silkworm body and silkworm seat to absorb moisture and disinfect the silkworm body, so as to keep the silkworm seat dry and hygienic and prevent silkworm disease. (6) Disinfection and disease prevention. Because the silkworm varieties reared in the Mid-Autumn Festival are spring varieties and their disease resistance is relatively weak, the disease prevention of silkworms in the Mid-Autumn Festival is more important. 1. Strengthen the disinfection of silkworm body and silkworm seat. The silkworms were disinfected with bleaching powder anti-stiff powder (lime powder: bleaching powder = 8:1). In the age, sunny day, use fresh lime powder once every morning or evening, rainy day, use once in the morning and evening, until ripe, the amount should be sufficient and uniform to ensure disinfection effect. Especially what often happens in previous years, be sure to make good use of fresh lime powder. 2. Use correctly to kill silkworm flies. Change the original use method, because the body spray method has a good effect of killing eggs and feeding method has a good killing effect on maggots in the silkworm body, so the use of silkworm maggots must be combined with feeding, and feeding must ensure the time of medication. Use a continuous course of treatment (3-4 times). Be sure to spray once before putting on the cluster. 3. Daily disease prevention and hygiene work. Wash hands before and after sand removal; step on lime in and out of the silkworm room; reduce dust as much as possible when removing sand; the appliances for transporting silkworm sand are strictly separated from those for transporting mulberry leaves. Silkworm sand cannot be poured at random next to the silkworm room. It should be poured into the silkworm bunker far away from the silkworm room and covered with plastic film. After sand removal, the floor of the silkworm room is disinfected with 0.3% available chlorine bleaching powder. Mulberry storage rooms and mulberry utensils should be disinfected with 0.3% 0.5% available chlorine bleaching powder every two days. 4. Observe the development of silkworm, find silkworm disease in time, and strengthen isolation. Often observe the development of silkworms, when diseased silkworms are found, pick them up in time, put them into a lime bowl, or bury them deeply in a plastic bag containing lime. Hands that have picked up diseased silkworms must be washed before feeding normal silkworms.