A new male silkworm hybrid, known as Qiuhuaping 30, has been developed by the Sericulture Research Institute of the Zhejiang Academy of Agricultural Sciences. This autumn male silkworm variety is characterized by its robust constitution, uniform growth across all stages, and excellent balance. It has a high ant head count of approximately 2,310 per gram, with a fifth instar duration of 6 days and 18 hours. The full-length development takes about 22.5 days, and it exhibits a hatching rate of 49.34% on the second day. The silk produced is long—about 1,240 meters—oval in shape, large, even, and white, with a high enamel layer and wire quality.
In terms of feeding techniques, this hybrid can be started earlier than typical varieties. It’s important to expand the feeding area promptly and avoid overeating or consuming unsuitable mulberry leaves. During the large silkworm stage, ensure that the mulberry is fresh and ripe. For small silkworms, maintain a higher temperature, use fresh mulberry leaves, and improve ventilation during the large silkworm period. The rearing temperature should be kept between 25°C and 25.5°C, with good air circulation to enhance the unwinding rate.
For managing the feeding process, proper mulberry leaf collection, transportation, and storage are essential. During the fourth instar, collect three-leaf shoots, while the fifth instar requires cut leaves from the shoot. In summer, pick budding buds and base leaves, and in autumn, focus on the basal leaves. At the end of the season, leave 5–6 leaves at the top of the shoot. Transport the leaves loosely, avoid direct sunlight, and immediately loosen them upon arrival to prevent spoilage. Store them in a cool, humid, and low-traffic environment, ensuring cleanliness and regular disinfection.
When feeding, ensure that the silkworms are fully satiated but also manage mulberry usage efficiently. Feed 3–4 times daily when using buds and leaves, and 2–3 times when using whole leaves. Before feeding, shake the leaves to loosen them and spread them evenly. When placing the leaves, align the tips and bases and feed them sequentially from one end to the other.
Expanding and evenly distributing the silkworms is crucial for optimal feeding. During the large silkworm stage, increase the area and ensure even distribution. A typical batch of 30,000 heads requires around 4 square meters for the largest stage, expanding up to 14 square meters in later stages. Regularly adjust the density to promote uniform growth and development.
Sand removal is an important step to keep the silkworms clean. Perform this task 4 times during the fourth instar and after each feeding, and once daily after the fifth instar. Follow standard procedures to ensure hygiene and prevent contamination.
Sleep processing should be delayed slightly, with the best time to start the sleep network being when the silkworms are ready. Maintain a temperature 0.5°C lower than the breeding temperature, ensure quiet conditions, and keep the environment dry initially. Moisturize the skin once the silkworms begin to sleep. Adjust feeding based on the color of the head, which should be pale brown for more than 90% of the population. In summer and autumn, advance feeding slightly due to higher temperatures, and control the amount of mulberry given to 80% of the maximum.
The feeding environment should remain relatively cool and dry. For the fourth instar, maintain a temperature of 24–25°C with a humidity difference of 2–3°C. The fifth instar prefers 23–24°C with a humidity difference of 3–4°C. Avoid temperatures below 20°C for the fourth instar and prolonged exposure above 28°C for the fifth instar to prevent stress.
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