'Esquimalt' Red Raspberry

HORTSCIENCE 40(7):2192–2194. 2005. the dates at which 5%, 50%, and 95% were reached (Table 1). Fruit fi rmness was measured as the force required to close the opening of ‘Esquimalt’ Red Raspberry the fruit with a push-pull spring gauge (Hunter Chaim Kempler,1 Hugh A. Daubeny2 and Brian Harding3 Spring Mechanical Force Gauge Series L; Ametek, Hatfi eld, Pa.) and was calculated on Agriculture and Agri-Food Canada, Pacifi c Agri-Food Research Centre, P.O. subsamples of ten randomly selected fruit, Box 1000, Agassiz, B.C., Canada V0M 1A0 three to fi ve times each harvest season. Fruit 4 samples were frozen until determination of Chad E. Finn pH and titratable acidity (as a percentage of U.S. Department of Agriculture-Agriculture Research Service, Horticultural citric acid) on a thawed subsample. ‘Esquimalt’ Crops Research Laboratory, Northwest Center for Small Fruit Research, was also evaluated in Washington (planted Corvallis, OR 97330 in 1999, WSU, Puyallup), Oregon (planted in 2000, Oregon State University–North Additional index words. Rubus idaeus, fruit breeding, fruit quality, fresh market, yield, Willamette Research and Extension Center), disease resistance and in Oxford, U.K. (planted in 2003, ADAS Horticulture). ‘Esquimalt’ was also evaluated ‘Esquimalt’ (Fig. 1) is a new fl oricane-fruit- the widely planted ‘Meeker’ and ‘Tulameen’, in British Columbia, Washington, and Oregon ing red raspberry (Rubus idaeus L.) cultivar were obtained from three replicated plantings grower fi elds. from the breeding program at the Pacifi c Agri- set in 1993, 1997, and 2000 at PARC’s substa- For all the variables, the interaction of Food Research Centre (PARC) of Agriculture tion in Abbotsford, B.C. (Table 1). The 1993 cultivar × planting year and cultivar × har- and Agri-Food Canada (AAFC), Agassiz, B.C. and 2000 planting were evaluated for 3 years, vest year was nonsignifi cant, hence the data ‘Esquimalt’ produces high yields of large, fi rm starting in 1995 and 2002 respectively, and the presented are means of all harvest years for fruit that ripen late, and is well suited to fresh 1997 planting was evaluated for 5 years start- each cultivar (Tables 1 and 2). ‘Esquimalt’ market sales. It is resistant to the common ing in 1999. Each planting was arranged in a yield and fruit size were signifi cantly higher strain of the North American raspberry aphid, randomized complete-block design in which than the other Pacifi c Northwest cultivars in Amphorophora agathonica Hottes, a vector of each cultivar was represented by three 3-plant this comparison (Table 1), which included the raspberry mosaic virus (RMV) complex. replications with 0.9 m between plants and ‘Qualicum’ and ‘Tulameen’, each of which is ‘Esquimalt’ is a B.C. First Nations word, which 3 m between rows. Yield, fruit weight, fruit recognized for high yield and large fruit size translates as “a place gradually shoaling”, and fi rmness, dates of harvest and postharvest fruit (Daubeny and Kempler, 1995, 2003). The is a city and a harbour on the southern tip of rot (caused primarily by Botrytis cinerea Pers. harvest season of ‘Esquimalt’ is late, starting Vancouver Island. The choice of name follows ex. Fr.) were measured each season from 1995 a few days later than ‘Meeker’, ‘Tulameen’, the tradition of naming PARC berry cultivars to 2004. Soluble solids concentration (SSC), and ‘Qualicum’, and almost 2 weeks later than with local First Nations words. fi rmness, titratable acidity and postharvest fruit ‘Malahat’, which is recognized for its earliness rot tests were carried out according to Barritt et (Kempler and Daubeny, 2000) (Table 1). The Origin al. (1980) and Daubeny and Pepin (1974). Fruit harvest duration is relatively long, similar to were harvested from 9 to 14 times a season, at that of ‘Malahat’ and ‘Tulameen’, and longer ‘Esquimalt’, which was tested as BC 89-2- 3- to 7-d intervals, depending on the length of than that of ‘Meeker’ and ‘Qualicum’. 89, was selected by H.A. Daubeny from a 1989 a cultivar’s harvest period and environmental ‘Esquimalt’ fruit is meaty, round to short cross of ‘Comox’ × ‘Glen Ample’. ‘Comox’, conditions. The average fruit weight for the conic in shape (Fig. 1) and has large drupe- released from PARC program in 1987, was season is a weighted mean, calculated from lets that can bleed when bruised; fruit color chosen as a parent because of its high yield the weight of a randomly selected 50 fruit is medium to light red and the fruit appears and good fruit quality (Daubeny, 1987). ‘Glen subsample from each plot on each harvest and shiny. Overall fruit appearance is attractive Ample’, released from the Scottish Crop Re- adjusted according to the yield for each harvest. and excellent. The ‘Esquimalt’ soluble solids search Institute in 1994, was chosen as a parent The fruit ripening season was characterized by concentration was signifi cantly lower then because of its high yield and adaptability to the the tested cultivars and fruit fi rmness was the fresh market (Daubeny, 1997; Raffl e and Allen, Fig. 1. ‘Esquimalt’ red raspberry. highest of all the tested cultivars, although 2001). The origin of ‘Esquimalt’ demonstrates the value of collaboration and exchange between breeding programs using germplasm of diverse origins. Performance and Description Performance data for ‘Esquimalt’ and sev- eral other Pacifi c Northwest cultivars, including Received for publication 17 May 2005. Accepted for publication 8 July 2005. This research was partially funded by the Raspberry Industry Development Council, Lower Mainland Horticultural Improvement Association, and the Washington Red Raspberry Com- mission. We gratefully acknowledge the assistance of L. Frey, M. Gross, and M. Bodnar, of Pacifi c Agri- Food Research Centre (PARC); M. Sweeney, British Columbia Ministry of Agriculture Food and Fisheries; T. Baumann, Univ. College of the Fraser Valley; P. Moore, Wash. State University, Puyallup; R. Martin, USDA Corvallis, Ore. PARC. contribution. 1Research scientist. 2Research scientist (retired). 3Research technician. 4Research geneticist. 2192 HORTSCIENCE VOL. 40(7) DECEMBER 2005 DDecemberBook.indbecemberBook.indb 22192192 110/19/050/19/05 55:29:50:29:50 PPMM Table 1. Yield and harvest season for ‘Esquimalt’ and other Pacifi c Northwest red raspberry cultivars.z Harvest Yield Fruit Fruit Harvest seasony duration Cultivar (kg/hill) wtx (g) rot (%) 5% 50% 95% (days) Esquimalt 5.52 aw 4.9 a 3.4 c 8 July a 24 July a 8 Aug. a 33 a Malahat 3.57 c 4.1 c 1.9 d 28 June d 11 July e 1 Aug. c 34 a Meeker 3.46 c 2.9 d 1.6 d 6 July b 20 July b 4 Aug. b 30 b Qualicum 4.56 b 4.4 b 5.4 a 4 July c 16 July d 31 July c 28 c Tulameen 4.38 b 4.4 b 4.5 b 6 July b 19 July c 9 Aug. a 34 a zYield, fruit weight and harvest dates are means from four plantings made in 1993, 1999, and 2000, harvested for 3 years each. yHarvest season = the date at which 5%, 50%, and 95% of the yield were harvested. xFruit weight was based on mean of 50 fruit/harvest. wMean separations within columns by Duncan’s multiple range test, P = 0.05. fi rmness was only signifi cantly higher than Phytophthora root rot (P. Moore, personal fruit well to pickers. The fruit are well spaced that of ‘Meeker’ (Table 2). Percent postharvest communication). In genotype trials at the on the laterals. fruit rot of ‘Esquimalt’ was similar to that of Oregon State University–North Willamette ‘Esquimalt’ has been characterized by ‘Meeker’ and ‘Qualicum’, lower than percent Research and Extension Center in Aurora, sequence repeat SSR marker analysis for 3 postharvest fruit rot of ‘Tulameen’, and higher Ore., ‘Esquimalt’ yield was signifi cantly higher markers; the patterns obtained were group 2, than percent postharvest fruit rot of ‘Malahat’, than ‘Meeker’and the other B.C. cultivars 5, and 1 for the fi rst, second, and third markers all of which are recognized for having lower in the trial (Table 3). The mean fruit size of respectively (Graham et al., 2002). levels of susceptibility to postharvest fruit rot ‘Esquimalt’ was signifi cantly higher than the than some other cultivars (Daubeny and Kem- other cultivars including of that of ‘Qualicum’ Disease and Pest Reaction pler, 1995; Kempler and Daubeny, 2000). The and ‘Tulameen’, two cultivars that are grown pH and the titratable acidity of ‘Esquimalt’ are mainly for the fresh market. ‘Esquimalt’ harvest ‘Esquimalt’ was selected in greenhouse very similar to those of ‘Qualicum’ and the other season started 1 week later than any cultivar. screening trails for resistance conferred by the tested cultivars. This similarity suggests that, The last harvest date of ‘Esquimalt’ was later gene Ag1 to the common biotype of A. agath- like ‘Tulameen’ and ‘Qualicum’, ‘Esquimalt’ is than that of ‘Meeker’, but was similar to that onica Hottes, the North American aphid vector acceptable for the fresh market. When fruit is of ‘Qualicum’ and ‘Tulameen’ (Table 3). In un- of the raspberry mosaic virus (RMV) complex. harvested before reaching the proper ripening replicated trials planted in 2002 in Forest Hill, Aphid colonization has been noted on plants in stage, a few drupelets often break. This may Oxford, U.K., the ‘Esquimalt’ harvest duration PARC trials. We assume that this is a resistant- create problems in harvesting fruit that is not lasted over 7 weeks. This duration was longer breaking biotype of the aphid, which has been completely ripe for long distance shipping. than that of ‘Glen Ample’ and ‘Tulameen’, the found on other cultivars with Ag1 gene (Kem- ‘Esquimalt’ fl owers are self fertile, and main fresh market cultivars that are grown in pler and Daubeny, 2000).

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