乐发ll　　The plant height is 97±10.4cm. The sprout top is pointed and green, its middle part is green and bottom part is rounded and blue, with few pubescences. The stem is purple and its cross section is triangular. The leaf is dark blue and large, with many pubescences. The leaf margin is flat widening; the compound leaves are large and elliptic and closed spaced. Cymose flower bud is long elliptic and green. The sepal is lanceolate and light green. The flower stalk is light purple. The corolla is light red, with yellow green five-star wheel grain. The petal tip is white. The pistil stylus is long the stylus head is rounded, binary fission and green. The stamens are yellow and conical and evenly gather around the ovary. It is without natural berry. The potato is elliptic, and the skin is red, with reticulate patterns, and the potato meat is yellow. The bud eye is shallow and red and has 9.30±1.75 bud eyes. The bud eyebrow is arc and umbilical part is raised. The potato tuberization is concentrated and evenly. Its storability is medium and its dormant period is 45±5 days. The fruit number of single potato is 8.6±2.8 pieces. The yield per plant is 945±0.61g. The mean weight of single potato is 117.39±4.53g. It is middle-late maturing, with a growth period of 125±5 days and the whole growth duration of 165±5 days. The plant is drought-enduring and cold-resistant. It is resistant to late blight and ring rot.