‘Rinka’ is an early maturing russet skin type new cultivar of Japanese pear (Pyrus pyrifolia Nakai) released in 2013 by the Institute of Fruit Tree and Tea Science (NIFTS), National Agriculture and Food Research Organization. The cultivar originated from a cross between ‘269-21’ (‘Hosui’ × ‘Osa – nijisseiki’) and ‘Akiakari’ in 1996, was selected as a promising tree in 2006, and subjected to the 8th national trial as Nashi Tsukuba 55 from 2007, which was conducted at 38 experimental stations in 37 prefectures throughout Japan. The cultivar was ultimately selected and released as ‘Rinka’ and was registered as No. 23912 under the Plant Variety Protection and Seed Act of Japan on March 3, 2015. ‘Rinka’ trees were intermediate and produced many fruit spurs and moderate amounts of axillary flower buds in the national trial. The date of full bloom of ‘Rinka’ averaged April 20, 2 days earlier than that of 'Kosui', and the harvest time averaged August 25, 2 days later than that of 'Kosui' in the national trial. It was resistant to black spot and there was no serious problem of diseases and insect pests under standard spraying program. ‘Rinka’ is cross-compatible with other leading cultivars as its S-genotype is S1S3, which is different from them. Since the number of fruitlets per cluster at 30 days after full bloom was averaged 3.1, which was fewer than that of ‘Kosui’ in the national trial, ‘Rinka’ possesses self-thinning trait. The fruit shape of ‘Rinka’ is oblate and uniformity of fruit is medium. The fruit weight averaged 448 g in the national trial, heavier than that of 'Kosui'. The flesh firmness of ‘Rinka’ was 4.5 lbs, softer than that of ‘Kosui’. The soluble solids content and pH in juice of ‘Rinka’ averaged 12.3% and 4.8, respectively, both of which were lower than those of ‘Kosui’. The eating quality of ‘Rinka’ was judged to be comparable with that of ‘Kosui’. The dead flower bud rate of ‘Rinka’ in Kagoshima prefecture (southwestern Japan) from 2011 to 2012 averaged approximately 5%, notably lower than that of ‘Kosui’, which averaged more than 40%. Therefore, ‘Rinka’ is expected to be a suitable cultivar for adapting to warmer climate.
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