Introduction to New Potato Varieties Longshu No. 3, No. 5, and No. 6

I. Variety Introduction

Longshu No. 3 (formerly coded 161-2) is a new high-starch potato variety bred by the Grain Crops Research Institute of the Gansu Academy of Agricultural Sciences through crossbreeding. It was approved by the Gansu Provincial Crop Variety Approval Committee in 1995 and won the second prize of the Gansu Provincial Science and Technology Progress Award in April 2002. This variety is mid-late maturing, with a growth period (from emergence to maturity) of about 110 days. The starch content of the tubers is 20.09-24.25%, which is 3-5 percentage points higher than that of ordinary mid-late maturing varieties, making it very suitable for starch processing. It is highly resistant to late blight and has field resistance to mosaic and leaf roll virus diseases. It has high yield; in multi-site production trials and demonstrations, the average yield per mu was 2,793.2 kg, an average increase of 37.3% over the control. It is not only suitable for promotion and planting in the high-cold humid, semi-humid, and semi-arid areas of Gansu Province, but the planting range has also expanded to Ningxia, Shaanxi, Qinghai, **, Hebei, Inner Mongolia, Heilongjiang and other provinces and autonomous regions.

Longshu No. 5 (formerly coded 216-10) is a new large-tuber table potato variety completed by the Grain Crops Research Institute of the Gansu Academy of Agricultural Sciences in 2002. This variety is late maturing, with a growth period (from emergence to maturity) of about 115 days. It is an excellent table variety and can also be used as a raw material for starch processing. The plants are highly resistant to late blight and have good field resistance to mosaic and leaf roll virus diseases. In production trials and demonstrations, the yield per mu was 2,363.5-3,415.0 kg, an increase of 18.9-55.6% over the main locally planted varieties. It is not only suitable for promotion and planting in the high-cold humid, semi-humid, and semi-arid areas of Gansu Province, but the planting range has also expanded to Ningxia, Shaanxi, Qinghai, **, Hebei, Inner Mongolia, Heilongjiang and other provinces and autonomous regions.

Longshu No. 6 (formerly coded 19408-10) is a new potato variety for starch and whole flour processing completed by the Grain Crops Research Institute of the Gansu Academy of Agricultural Sciences in 2004. It was approved by the National Crop Variety Approval Committee in May 2005. This variety is late maturing, with a growth period (from emergence to maturity) of about 115 days. It has strong growth vigor and lush plants. It is a potato variety with high starch and low reducing sugar, suitable for both starch processing and whole flour processing. It has strong disease resistance, is highly resistant to late blight, and has very good field resistance to mosaic and leaf roll virus diseases. It has good yielding ability; in production trials and demonstrations, the yield per mu was 2,835.5-4,020.0 kg, an increase of 14.4-78.4% over the main locally planted varieties. It is not only suitable for promotion and planting in the high-cold humid, semi-humid, and semi-arid areas of Gansu Province, but is also suitable for promotion and planting in the Guyuan area of Ningxia, Hainan Prefecture of Qinghai, Zhangjiakou and Chengde areas of Hebei, and the Ulanqab League and Wuchuan areas of Inner Mongolia and other northern single-cropping regions.