Brief introduction of New varieties of Mulberry and Silkworm

1. Nongsang No. 12 is a new mulberry variety bred by artificial sexual hybridization by sericulture Research Institute of Zhejiang Academy of Agricultural Sciences in 1984. Main characters: compact crown, more clockwork, long and straight branches, thick mesophyll, dark green leaves, germination earlier than white lotus leaves, fast growth and strong adaptability. Regional test results: leaf yield per mu 1867kg, 18.73% higher than the control lotus leaf white, significantly higher than the control; ten thousand silkworm cocoon layer measurement 7kg, 8% higher than the control lotus leaf white product tax. 0.3%, significantly higher than the control; resistance to yellowing atrophy and mulberry blight was stronger than the control; the harm of mulberry thrips and red spiders was significantly higher than that of lotus leaves. The identification of regional test showed that Nongsang 12 was an excellent new mulberry variety with early growth and middle maturity. It has been approved by Zhejiang Province and National crop Variety approval Committee in 2000 because of its high leaf yield, excellent leaf quality and strong resistance to disease and insect pests. This city has introduced 2. 5% this spring. 320000 plants, planting 16 mu. two。 Fruit and leaf dual-use mulberry "Da 10": it is a single plant selected by the Silkworm Research Institute of Guangdong Academy of Agricultural Sciences from the garden of Nanhai County after many years of cultivation and identification. Jinhua City was introduced at the end of 1992. After years of cultivation and adaptability observation, it is proved that it is suitable for local cultivation because of its fast germination, fast growth, high yield of fruit leaves and wide adaptability. Main characteristics: early germination, high germination rate, fast growth, growing period 9 min 10 days earlier than that of lotus leaf. Fruit production performance: under normal conditions, each bud can bear 4Mel 6 or more; mulberry fruit is large, thick, seedless; fruit shape is 3.5-5cm, transverse diameter 1.5-2cm, single fruit weight reaches kg, the maximum fruit weight is 6.2g, which is much higher than that of ordinary mulberry fruit; mulberry yield can reach 1185kg/ mu in mature mulberry orchards that mainly produce fruit; mulberry yield can reach 567kg/ mu in adult mulberry groups mainly producing leaves. And fruit production or leaf production can be adjusted according to the market situation. Leaf yield performance: the annual leaf yield of fruit-based adult mulberry garden can reach 1550kg/ mu, and the annual leaf yield of adult mulberry garden can reach 2280kg/ mu. Planting density: planting 1000 trees per mu in leaf-producing mulberry orchards and 600 trees per mu in fruit-producing mulberry orchards, especially 600 trees. 22300 plants of this variety have been introduced into this city and 54 mu have been planted. Spring silkworm variety "Chunlei × Zhenzhu": it is the most abundant multi-silk silkworm variety among the three pairs of spring silkworm varieties popularized in Zhejiang Province in the 1990s. The cocoon yield of ten thousand silkworms (19.21kg) is higher than that of Zhejiang Lei × Chunxiao, which is 4.0% higher than that of Zhejiang Lei × Chunxiao. The cocoon shell weight 5.184kg of ten thousand silkworms is 12.45% higher than that of Zhejiang Lei × Chunxiao, and the whole cocoon weight is 1.93g, 0.09g and 4.89% higher than that of Zhejiang Lei × Chunxiao. Cocoon shell weight .52g, Jiaozhelei × Chunxiao 0.06g, 2.76% high, cocoon filament length 1391m. It is 16m taller and 1.16% longer than Zhejiang Lei × Chunxiao, and the comfort rate is 64.41%. It is 9.44% lower than Zhejiang Lei × Chunxiao. Among the three pairs of spring popularized varieties in / Jiangsu Province, this variety belongs to the variety with the highest cocoon production and silk yield, but its comfort is slightly worse. At present, Zhejiang Lei Chunxiao is about to be eliminated, Chunlei × Zhenzhu is likely to take its place.