A brief introduction to new mulberry and silkworm varieties, explained in one article

1. Nongsang No. 12: A new mulberry variety bred by the Sericulture Research Institute of the Zhejiang Academy of Agricultural Sciences in 1984 through artificial sexual hybridization. Main traits: compact crown, many shoots, long and straight branches, thick leaf flesh, dark green leaf color, sprouting earlier than Heye Bai, fast growth, strong adaptability. Regional trial results: leaf yield per mu 1867 kg, 18.73% higher than the control Heye Bai, significantly higher than the control; cocoon shell weight per 10,000 silkworms 7 kg, 8.03% higher than the control Heye Bai, extremely significantly higher than the control; resistance to yellowing-type dwarf disease and mulberry bacterial blight stronger than the control; damage from mulberry thrips and red spider mites obviously lighter than on Heye Bai. Regional trial identification shows that Nongsang No. 12 is an excellent early-growing, mid-maturing new mulberry variety. It has high leaf yield, excellent leaf quality, and strong disease and insect resistance, and passed the approval of the Zhejiang Province and National Crop Variety Approval Committee in 2000. This city has introduced 23,200 plants this spring, planted on 16 mu. 2. Dual-purpose fruit and leaf mulberry "Da 10": Bred by the Sericulture Research Institute of the Guangdong Academy of Agricultural Sciences from a single plant selected in Nanhai County after years of cultivation and identification. Jinhua City introduced it at the end of 1992, and after years of cultivation and adaptability observation, it has been proven to sprout and grow quickly, with high fruit and leaf yields and wide adaptability, suitable for local cultivation. Main characteristics: early sprouting, high sprouting rate, fast growth, growth period 9-10 days earlier than Heye Bai. Fruit production performance: under normal conditions each bud can bear 4-6 fruits, or even more; the mulberries are large, thick-fleshed, and seedless; fruit length 3.5-5 cm, transverse diameter 1.5-2 cm, single fruit weight up to kg, maximum fruit weight 6.2 g, greatly exceeding ordinary mulberries; in mature mulberry orchards mainly for fruit production, mulberry fruit yield can reach 1185 kg/mu; in mature mulberry orchards mainly for leaf production, mulberry fruit yield can reach 567 kg/mu; and whether fruit production or leaf production is the main purpose can be adjusted according to market conditions. Leaf production performance: mature mulberry orchards mainly for fruit production can reach an annual leaf yield of 1550 kg/mu, and mature mulberry orchards mainly for leaf production can reach an annual leaf yield of 2280 kg/mu. Planting density: fruit mulberry orchards mainly for leaf production are best planted at 750-1000 plants per mu; fruit mulberry orchards mainly for fruit production are best planted at 450-600 plants per mu, especially 600 plants. This city has introduced 22,300 plants of this variety, planted on 54 mu. Spring-use silkworm variety "Chunlei x Zhenzhu": Among the three pairs of spring-use silkworm varieties promoted in Zhejiang Province in the 1990s, it is the high-yield, high-silk-volume silkworm variety with the strongest performance; cocoon yield per 10,000 silkworms 19.21 kg, 0.74 kg higher than Zhelei x Chunxiao, 4.0% higher; cocoon shell weight per 10,000 silkworms 5.184 kg, 0.574 kg higher than Zhelei x Chunxiao, 12.45% higher; whole cocoon weight 1.93 g, 0.09 g higher than Zhelei x Chunxiao, 4.89% higher; cocoon shell weight .52 g, 0.06 g higher than Zhelei x Chunxiao, 2.76% higher; cocoon silk length 1391 m, 16 m longer than Zhelei x Chunxiao, 1.16% longer; reelability rate 64.41%, 9.44% lower than Zhelei x Chunxiao. Among the three pairs of promoted spring-use varieties in Zhejiang Province, this variety has the strongest constitution and the highest cocoon and silk yields, though its reelability is slightly poorer. At present Zhelei x Chunxiao is about to be eliminated, and Chunlei x Zhenzhu may replace it.