Key points of cassava silkworm feeding

The breeding technology of cassava silkworm is divided into several links, and each link needs strict requirements and careful management to achieve the goal of high yield and high quality.

Suitable feeding time of cassava silkworm. Cassava silkworm has strong adaptability, and can be raised normally in May-165438+10 in South China. In order to raise cassava silkworm without affecting cassava yield, the best time should be August-65438+1October when cassava grows vigorously. At this time, the temperature is high, cassava grows vigorously and has many leaves, which is beneficial to picking cassava leaves and feeding cassava silkworms without affecting cassava yield.

3. Selection of improved varieties: The quality of silkworm eggs is directly related to the success, yield and quality of rearing. Practice has proved that "Huangbai" and "Nancan 1" which are suitable for breeding cassava silkworm eggs in Guangxi are the best. At present, these silkworm eggs are supplied by Wuming County Silkworm Egg Station.

3. Silkworm eggs are green. After the silkworm eggs are bought back, they are placed in an environment with a relative humidity of 90-95% and a temperature of 25-28℃. When drying at high temperature, a earthen pot or earthen basin can be used in rural areas to hold about two-fifths of cool and clean well water, and then the silkworm eggs are spread in a small basket, hung in a earthen pot near the water surface, and the mouth of the earthen pot is covered with a wet cloth. It takes about 8 ~ 10 days and nights to hatch into an ant silkworm.

4. Ant picking: After the ants hatch, cut the tender cassava leaves into small pieces and cover them thinly on the silkworm body. After the ants are attached, the cassava leaves on the silkworm plaque are gently collected for separate cultivation, so that the ants collected on the same day cannot be mixed together, avoiding uneven development and difficult feeding management.

5. Picking, transportation and storage of cassava leaves. Cassava for sericulture is very fresh in Harrison. The higher the nutritional value, the more you eat. Leaf picking should be carried out in the morning and evening, and rapid picking and transportation should be adopted in the older period to avoid sun and heat deterioration. When storing leaves, sprinkle water properly and store them in a cool and clean place.

Give leaves reasonably. Feeding leaves should not only ensure that silkworms are full, but also save leaves. Young silkworms are fed with mature and tender leaves and cut into small squares. 5-year-old silkworms can be fed with whole leaves.

Feeding of young silkworms. 1 ~ 3 years old is the young silkworm stage, which is the foundation and should be carefully raised and managed. Reasonable adjustment of rearing environment, careful selection of leaves for young silkworms, removal of silkworm droppings, timely expansion of silkworm nests, frequent disinfection of silkworms with bleaching powder to prevent diseases.

⒏ Raise big silkworms. Silkworm is the key period of silk gland growth, so it is necessary to have good leaves and adequate food, frequent ventilation, timely sand removal and swelling. Prevent ants and rats, wash leaves and feed them wet. Feed every 2 ~ 3 hours, day and night, to prevent silkworm starvation and reduce production.

Pet-name ruby sleep management. Cassava silkworm has to go through four times of sleep molting, during which the physiological changes of silkworm body are complicated, physical exertion is high, resistance is weakened, and it is prone to diseases, so it must be carefully cared for. Prevention of hunger and sleep, management of high temperature, direct sunlight and strong winds. Feed fresh leaves after sleep, and be careful not to give too many leaves.

⒑ Management. Cassava silkworm enters the 5th instar after peeling for four times, and gradually eats less after 5-6 days of satiety. Discharge a lot of soft feces and mucus, shorten the body and become transparent, and climb high. This is the characteristic of mature silkworms, which can be picked up and hung up. It is best to use plastic net or semi-dry poplar branches with leaves as coating material. Silkworms complete spinning in about 3 days after cocoon formation and pupate in about 5 days. When the pupa turns brown, cut the cocoon length of 1/2 from the perforated end of the cocoon with scissors, and pour out the pupa. When cutting the cocoon, don't hurt the pupa, and keep the cocoon skin white, dry and pollution-free.

Reasonable leaf picking and silkworm rearing and developing cassava cocoon production are the reuse of cassava by-products, which can directly increase the economic benefits of cassava planting. Cassava is drought-resistant, salt-tolerant and adaptable. Suitable for the development and utilization of barren hills and wasteland, it has developed rapidly in recent years. Raising cassava silkworm is a rich project with less investment and quick results.