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A P R I L 2 0 1 618 POTATO GROWER 2015 Processing Potato Trial Larimore North Dakota by Asunta Susie Thompson Potato Breeder NDSU The northern plains potato produc- tion areas of Minnesota and North Dakota produce potatoes for all mar- kets including tablestock seed and processing. About 60 of produc- tion is for processing chips and frozen including French fries. Russet Burbank is grown on about 35 of the acreage in North Dakota with Prospect Russet being grown on about 15. Russet Burbank while the industry standard has several shortcomings it is a long-season cul- tivar it requires high amounts of inputs including fertilizer and water and it is susceptible to many pests but more importantly to many stresses including temperature and moisture. Cultivars possessing excel- lent processing quality including low sugar accumulation and high specific gravity and that are more environ- mentally and economically sustain- able are of interest to producers processors and consumers. In order to identify superior geno- types the North Dakota State University NDSU potato breeding program conducts crossing selec- tion evaluation and cultivar devel- opment activities across North Dakota and western Minnesota. In 2015 field research trials were grown at eight sites. Five were irrigated Larimore Oakes Inkster Williston and Park Rapids and three were non-irrigated Hoople Crystal and Grand Forks sites. These trials are important in identifying selections with high yield potential disease and pest resistance stress tolerance and consumer quality attributes for tablestock and processing genotypes. This report summarizes the results from the Larimore Processing Trial. Twenty-four advancing dual-purpose russet selections and commercially acceptable cultivars were included in the trial planted on April 25. The field plot design was a randomized complete block with four replicates cultural practices typical of the grow- ing area were used during the grow- ing season including sprinkler irriga- tion. Rows were 36 inches apart with a 12-inch within-row spacing. Vines were flailed on September 16 and the trial was harvested on September 24. Typically we flail within a day or two of harvest in order to mimic what many process growers are doing in terms of green digging. Days to vine kill were 144 while days to harvest totaled 152. Agronomic and quality evaluations yield and grade and French fry qual- ity are summarized in Tables 1 2 and 3 respectively. Percentage stand ranged from 89 to 100 Table 1. Many entries particularly those with Dakota Trailblazer as a parent tend to have strong dormancy. Vine sizes significantly differed as expected and ranged from very small for ND091933ABCR-7Russ ND8068- 5Russ and ND102647-3Russ to very large for Dakota Trailblazer and ND113174B-2Russ. Vine maturity ranged from 1.0 very early for ND8068-5Russ and ND091933ABCR- 7Russ to 4.3 medium late for ND113174B-2Russ. Stems per plant is indicative of seed quality physio- logical age and seed size tuber eye number genetic and length of dor- mancy genetic. Stem numbers ranged from 1.1 for Dakota Russet to 2.0 for ND8068-5Russ. Seed quality was excellent in 2015 and this was reflected in the stem numbers. Most cultivars peak performance will be in the 1.5 to 3.0 stem range. Total yields were significantly differ- ent ranging from 222 cwt.acre for ND049546b-10Russ to 488 cwt.acre for Alpine Russet Table 2. Yield of US No. 1s ranged from 202 for ND091933ABCR-7Russ to 446 for Alpine Russet. Percentage US No. 1s ranged from 65 for Shepody to 92 for Dakota Russet and WND8624-2Russ. Due to a more normal growing season late April through mid-September the tuber size profile for all clones tended to be larger than in 2014 when we experi- enced a very short growing season and the size profile was small. The percentage of 6 to 12 ounce size tubers for most clones was in the upper 40 to mid-50 percentage range. Several clones could have per- haps been vine killed earlier because they had an excessively high per- centage of oversized tubers ND019194AB-1Russ ND049251B- 9Russ ND060761B-3Russ ND081764B-4Russ ND091938BR- 2Russ ND113174B-2Russ Dakota