Raspberry

This article is about the various species of raspberry in the plant genus Rubus. For the widely cultivated Eurasian red raspberry, see Rubus idaeus. For the eastern North American black raspberry, see Rubus occidentalis. For other uses, see Raspberry (disambiguation).
Fruit of four species of raspberry. Clockwise from top left: Boulder raspberry, Korean raspberry, Australian native raspberry, West Indian raspberry

The raspberry (/ˈræzˌbɛri/) is the edible fruit of a multitude of plant species in the genus Rubus of the rose family, most of which are in the subgenus Idaeobatus; the name also applies to these plants themselves.

Raspberries are perennial with woody stems.

Major kinds of cultivated raspberries

Fruits of a golden or yellow raspberry cultivar

Raspberries are an important commercial fruit crop, widely grown in all temperate regions of the world.

Many of the most important modern commercial red raspberry cultivars derive from hybrids between R. idaeus and R. strigosus.[1] Some botanists consider the Eurasian and American red raspberries to belong to a single, circumboreal species, Rubus idaeus, with the European plants then classified as either R. idaeus subsp. idaeus or R. idaeus var. idaeus, and the native North American red raspberries classified as either R. idaeus subsp. strigosus, or R. idaeus var. strigosus. Recent breeding has resulted in cultivars that are thornless and more strongly upright, not needing staking.

The black raspberry, Rubus occidentalis, is also cultivated, providing both fresh and frozen fruit, as well as jams, preserves, and other products, all with that species' distinctive flavor.

Purple raspberries have been produced by horticultural hybridization of red and black raspberries, and have also been found in the wild in a few places (for example, in Vermont) where the American red and the black raspberries both grow naturally. Commercial production of purple-fruited raspberries is rare.

Blue raspberry, is a local name used in Prince Edward Country, Ontario, Canada[2] for the cultivar 'Columbian', a hybrid (purple raspberry) of R. strigosus and R. occidentalis.[3]

Both the red and the black raspberry species have albino-like pale-yellow natural or horticultural variants, resulting from presence of recessive genes that impede production of anthocyanin pigments. Fruits from such plants are called golden raspberries or yellow raspberries; despite their similar appearance, they retain the distinctive flavor of their respective species (red or black). Most pale-fruited raspberries commercially sold in the eastern United States are derivatives of red raspberries. Yellow-fruited variants of the black raspberry are sometimes grown in home gardens.

Red raspberries have also been crossed with various species in other subgenera of the genus Rubus, resulting in a number of hybrids, the first of which was the loganberry. Later notable hybrids include boysenberry (a multi-generation hybrid), and tayberry. Hybridization between the familiar cultivated red raspberries and a few Asiatic species of Rubus has also been achieved.

Species

Until recently, the most commonly cultivated raspberries have been red-fruited hybrids between R. idaeus and R. strigosus.
Purple-fruited raspberry hybrids (and black raspberries) are of interest to growers because of their potential for nutraceuticals.[4]

Examples of raspberry species in Rubus subgenus Idaeobatus include:

Several species of Rubus, also called raspberries, are classified in other subgenera, including:

Uses

Fruit

Raspberries are grown for the fresh fruit market and for commercial processing into individually quick frozen (IQF) fruit, purée, juice, or as dried fruit used in a variety of grocery products. Traditionally, raspberries were a midsummer crop, but with new technology, cultivars, and transportation, they can now be obtained year-round. Raspberries need ample sun and water for optimal development. Raspberries thrive in well-drained soil with a pH between 6 and 7 with ample organic matter to assist in retaining water.[5] While moisture is essential, wet and heavy soils or excess irrigation can bring on Phytophthora root rot, which is one of the most serious pest problems facing the red raspberry. As a cultivated plant in moist, temperate regions, it is easy to grow and has a tendency to spread unless pruned. Escaped raspberries frequently appear as garden weeds, spread by seeds found in bird droppings.

An individual raspberry weighs 3–5 g (0.11–0.18 oz), and is made up of around 100 drupelets,[6] each of which consists of a juicy pulp and a single central seed. A raspberry bush can yield several hundred berries a year. Unlike blackberries and dewberries, a raspberry has a hollow core once it is removed from the receptacle.

Nutrients and phytochemicals

Raspberries, raw
Nutritional value per 100 g (3.5 oz)
Energy 220 kJ (53 kcal)
11.94 g
Sugars 4.42 g
Dietary fiber 6.5 g
0.65 g
1.2 g
Vitamins
Thiamine (B1)
(3%)

0.032 mg

Riboflavin (B2)
(3%)

0.038 mg

Niacin (B3)
(4%)

0.598 mg

Pantothenic acid (B5)
(7%)

0.329 mg

Vitamin B6
(4%)

0.055 mg

Folate (B9)
(5%)

21 μg

Choline
(3%)

12.3 mg

Vitamin C
(32%)

26.2 mg

Vitamin E
(6%)

0.87 mg

Vitamin K
(7%)

7.8 μg

Minerals
Calcium
(3%)

25 mg

Iron
(5%)

0.69 mg

Magnesium
(6%)

22 mg

Manganese
(32%)

0.67 mg

Phosphorus
(4%)

29 mg

Potassium
(3%)

151 mg

Zinc
(4%)

0.42 mg

Link to USDA Database entry
Percentages are roughly approximated using US recommendations for adults.
Source: USDA Nutrient Database

The aggregate fruit structure contributes to raspberry's nutritional value, as it increases the proportion of dietary fiber, which is among the highest known in whole foods, up to 6% fiber per total weight.[7] Raspberries are a rich source of vitamin C, with 26 mg per 100 g serving (32% Daily Value), manganese (32% Daily Value) and dietary fiber (26% Daily Value). Raspberries are a low-glycemic index food, with total sugar content of only 4% and no starch.[7]

Raspberries contain anthocyanin pigments, ellagic acid (from ellagotannins, see for instance the polyphenol ellagitannin), quercetin, gallic acid, cyanidins, pelargonidins, catechins, kaempferol and salicylic acid.[8][9] Yellow raspberries and others with pale-colored fruits are lower in anthocyanins.[8] Both yellow and red raspberries contain carotenoids, mostly lutein esters, but these are masked by anthocyanins in red raspberries.[10]

Commercial production

Top producers of raspberries in tons
Shown in 2011 order
Country 2010 2011
 Russia 125,000 27% 140,000 26%
 Poland 92,864 20% 117,995 22%
 Serbia 83,870 18% 89,602 16%
 United States 36,741 8% 48,948 9%
 Ukraine 25,700 5% 28,100 5%
 Mexico 14,343 3% 21,468 4%
 United Kingdom 17,000 4% 16,761 3%
 Canada 11,864 3% 12,285 2%
 Azerbaijan 10,100 2% 11,000 2%
 Spain 9,226 2% 9,559 2%
 Total 471,322100%543,421100%
Source: UN FAOSTAT [11]
Worldwide raspberry yield

Leaves

Raspberry leaves can be used fresh or dried in herbal teas, providing an astringent flavor. In herbal and traditional medicine, raspberry leaves are used for some remedies, there is no scientifically valid evidence to support their medicinal use.[12]

Cultivation

Cultivated raspberry, in flower in a garden

Various kinds of raspberries can be cultivated from hardiness zones 3 to 9.[1] Raspberries are traditionally planted in the winter as dormant canes, although planting of tender, plug plants produced by tissue culture has become much more common. A specialized production system called "long cane production" involves growing canes for a year in a northern climate such as Scotland or Oregon or Washington, where the chilling requirement for proper bud break is attained, or attained earlier than the ultimate place of planting. These canes are then dug, roots and all, to be replanted in warmer climates such as Spain, where they quickly flower and produce a very early season crop. Plants are typically planted 2-6 per m in fertile, well drained soil; raspberries are usually planted in raised beds/ridges, if there is any question about root rot problems.

The flowers can be a major nectar source for honeybees and other pollinators.

Raspberries are very vigorous and can be locally invasive. They propagate using basal shoots (also known as suckers), extended underground shoots that develop roots and individual plants. They can sucker new canes some distance from the main plant. For this reason, raspberries spread well, and can take over gardens if left unchecked.

Raspberries are often propagated using cuttings, and will root readily in moist soil conditions. Using cuttings preserves the genotype of the parent, and is the preferred method of propagation when making large plantings.

The fruit is harvested when it comes off the receptacle easily and has turned a deep color (red, black, purple, or golden yellow, depending on the species and cultivar). This is when the fruits are ripest and sweetest. Excess fruit can be made into raspberry jam or frozen.

High tunnel bramble production offers the opportunity to bridge gaps in availability during late fall and late spring. Furthermore, high tunnels allow less hardy floricane-fruiting raspberries to overwinter in climates where they wouldn't otherwise survive. In the tunnel plants are established at close spacing usually prior to tunnel construction.[13]

Selected important cultivars

fruits of Rubus 'Wyoming', a purple raspberry cultivar
a young leaf of 'Glen Prosen', a red cultivar
'Schönemann'

Numerous raspberry cultivars have been selected.

Two types of raspberry are available for commercial and domestic cultivation; the summer-bearing type produces an abundance of fruit on second-year canes (floricanes) within a relatively short period in midsummer, and double or "everbearing" plants, which also bear some fruit on first-year canes (primocanes) in the late summer and fall, as well as the summer crop on second-year canes. Those marked (AGM) have gained the Royal Horticultural Society's Award of Garden Merit.

Red, early summer fruiting
  • Boyne
  • Fertödi Venus
  • Rubin Bulgarski
  • Cascade Dawn
  • Glen Clova
  • Glen Moy (AGM)[14]
  • Killarney
  • Malahat
  • Malling Exploit
  • Malling Jewel (AGM)[15]
  • Titan
  • Willamette
Red, midsummer
  • Cuthbert
  • Glen Ample (AGM)[16]
  • Glen Prosen (AGM)[17]
  • Lloyd George
  • Meeker
  • Newburgh
  • Ripley
  • Skeena
  • Cowichan
  • Chemainus
  • Saanich
Red, late summer
  • Cascade Delight
  • Coho
  • Fertödi Rubina
  • Leo (AGM)[18]
  • Malling Admiral (AGM)[19]
  • Octavia
  • Schoenemann
  • Tulameen
Red, primocane, fall, autumn fruiting
  • Amity
  • Augusta
  • Autumn Bliss (AGM)[20]
  • Joan J. (Thornless)
  • Caroline
  • Fertödi Kétszertermö
  • Heritage
  • Josephine
  • Ripley
  • Summit
  • Zeva Herbsternte
Gold/Yellow, primocane, fall, autumn fruiting
  • Anne
  • Fallgold
  • Fertödi Aranyfürt
  • Goldenwest
  • Golden Queen
  • Honey Queen
  • Kiwi Gold
Purple
  • Brandywine
  • Glencoe
  • Royalty
Black
  • Black Hawk
  • Bristol
  • Cumberland
  • Jewel
  • Munger
  • Ohio Everbearer
  • Scepter

Diseases and pests

Raspberries are sometimes eaten by the larvae of some Lepidoptera species (butterflies and moths). Botrytis cinerea, or gray mold, is a common fungal infection of raspberries and other soft fruit under wet conditions. It is seen as a gray mold growing on the raspberries, and particularly affects fruit which are bruised, as it provides an easy entrance point for the spores.

Raspberry plants should not be planted where potatoes, tomatoes, peppers, eggplants, or bulbs have previously been grown, without prior fumigation of the soil. These crops are hosts for the disease Verticillium wilt, a fungus that can stay in the soil for many years and can infest the raspberry crop.

See also

References

  1. 1 2 Huxley, A., ed. (1992). New RHS Dictionary of Gardening. Macmillan ISBN 0-333-47494-5.
  2. ↑ Woolfrey, Sandra Marshall. A Country Mouse with one paw in the Village:Growing up in Prince Edward County (PDF).
  3. ↑ Hedrick, U.P.; Howe, G.H.; Taylor, O.M.; Berger, A.; Slate, G.L.; Einset, O. (1925). The small fruits of New York. Albany, New York: J. B. Lyon. page 96
  4. ↑ Kempler, C.; Hall, H.; Finn, C. (2012). "Raspberry". In M.L. Badenes; D.H. Byrne. Fruit Breeding 8. Springer US. pp. 263–304.
  5. ↑ Strik, B.C. (2008). "Growing Raspberries in Your Home Garden" (PDF). Growing Small Fruits. Oregon State University Extension Service. Retrieved 29 April 2016.
  6. ↑ Iannetta, P. P. M.; Wyman, M.; Neelam, A.; Jones, C.; Taylor, M. A.; Davies, H. V.; Sexton, R. (December 2000). "A causal role for ethylene and endo-beta-1,4-glucanase in the abscission of red-raspberry (Rubus idaeus) drupelets". Physiol. Plant. 110 (4): 535–543. doi:10.1111/j.1399-3054.2000.1100417.x.
  7. 1 2 "Nutrient data for raw raspberries, USDA Nutrient Database, SR-21". Conde Nast. 2014. Retrieved 16 April 2014.
  8. 1 2 Carvalho E, Franceschi P, Feller A, Palmieri L, Wehrens R, Martens S (2013). "A targeted metabolomics approach to understand differences in flavonoid biosynthesis in red and yellow raspberries". Plant Physiol Biochem 72: 79–86. doi:10.1016/j.plaphy.2013.04.001. PMID 23622736.
  9. ↑ Mazur SP, Nes A, Wold AB, Remberg SF, Aaby K (2014). "Quality and chemical composition of ten red raspberry (Rubus idaeus L.) genotypes during three harvest seasons". Food Chem 160: 233–40. doi:10.1016/j.foodchem.2014.02.174. PMID 24799233.
  10. ↑ Carvalho, Elisabete; Fraser, P.D.; Martens, S. (2013). "Carotenoids and tocopherols in yellow and red raspberries". Food Chemistry 139: 744–752. doi:10.1016/j.foodchem.2012.12.047.
  11. ↑ "Statistics from: Food And Agricultural Organization of United Nations: Economic And Social Department: The Statistical Division". UN Food and Agriculture Organization Corporate Statistical Database.
  12. ↑ Lone Holst; Svein Haavik; Hedvig Nordeng (13 June 2009). "Raspberry leaf – Should it be recommended to pregnant women?". Complementary therapies in clinical practice 15 (4): 204–8. doi:10.1016/j.ctcp.2009.05.003. PMID 19880082.
  13. ↑ "High Tunnel Raspberries and Blackberries", Department of Horticulture publication, Cathy Heidenreich, Marvin Pritts, Mary Jo Kelly., and Kathy Demchak
  14. ↑ RHS Plant Selector Rubus idaeus 'Glen Moy' PBR (F) AGM / RHS Gardening. Apps.rhs.org.uk. Retrieved on 2012-09-24.
  15. ↑ RHS Plant Selector Rubus idaeus 'Malling Jewel' (F) AGM / RHS Gardening. Apps.rhs.org.uk. Retrieved on 2012-09-24.
  16. ↑ RHS Plant Selector Rubus idaeus 'Glen Ample' PBR (F) AGM / RHS Gardening. Apps.rhs.org.uk. Retrieved on 2012-09-24.
  17. ↑ RHS Plant Selector Rubus idaeus 'Glen Prosen' PBR (F) AGM / RHS Gardening. Apps.rhs.org.uk. Retrieved on 2012-09-24.
  18. ↑ RHS Plant Selector Rubus idaeus 'Leo' PBR (F) AGM / RHS Gardening. Apps.rhs.org.uk. Retrieved on 2012-09-24.
  19. ↑ RHS Plant Selector Rubus idaeus 'Malling Admiral' (F) AGM / RHS Gardening. Apps.rhs.org.uk. Retrieved on 2012-09-24.
  20. ↑ RHS Plant Selector Rubus idaeus 'Autumn Bliss' (F) AGM / RHS Gardening. Apps.rhs.org.uk. Retrieved on 2012-09-24.

Further reading

External links

Wikisource has the text of the 1911 Encyclopædia Britannica article Raspberry.
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