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Pear
Species of fruit

Pears, fruits of the Pyrus genus in the Rosaceae family, are grown worldwide and harvested from late summer to mid-autumn. Native to Europe, North Africa, and Asia, the medium-sized pear tree produces pomaceous fruit valued fresh, canned, juiced, dried, or fermented as perry. Over 3,000 varieties exist, differing in shape and flavor. Besides fruit, pear wood is prized for making woodwind instruments and furniture. Pear trees belong to a species valued both for their edible fruit and ornamental qualities.

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Etymology

The word pear is probably from Germanic pera as a loanword of Vulgar Latin pira, the plural of pirum, akin to Greek apios (from Mycenaean ápisos),1 of Semitic origin (pirâ), meaning "fruit". The adjective pyriform or piriform means pear-shaped.2 The classical Latin word for a pear tree is pirus;3 pyrus is an alternate form of this word sometimes used in medieval Latin.4

Description

The pear is native to coastal, temperate, and mountainous region, It is found from Western Europe and North Africa east across Asia.56 They are medium-sized trees, reaching up to 20 m tall, often with a tall, narrow crown; a few pear species are shrubby.78

The leaves are alternately arranged, simple, 2–12 cm (1–4+1⁄2 in) long, glossy green on some species, densely silvery-hairy in some others; leaf shape varies from broad oval to narrow lanceolate.9 Most pears are deciduous, but one or two species in Southeast Asia are evergreen.1011 Some pears are cold-hardy, withstanding temperatures as low as −25 to −40 °C (−13 to −40 °F) in winter, but many grown for agriculture are vulnerable to cold damage.1213 Evergreen species only tolerate temperatures down to about −12 °C (10 °F).14

The flowers are white, rarely tinted yellow or pink, 2–4 centimetres (1–1+1⁄2 in) diameter, and have five petals, five sepals, and numerous stamens.1516 Like that of the related apple, the pear fruit is a pome, in most wild species 1–4 cm (1⁄2–1+1⁄2 in) diameter, but in some cultivated forms up to 18 cm (7 in) long and 9 cm (3+1⁄2 in) broad.17 The shape varies in most species from oblate or globose, to the classic pyriform "pear shape" of the European pear with an elongated basal portion and a bulbous end.18

The fruit is a pseudofruit composed of the receptacle or upper end of the flower stalk (the so-called calyx tube) greatly dilated.19 Enclosed within its cellular flesh is the true fruit: 2–5 'cartilaginous' carpels,2021 known colloquially as the "core".22

Pears and apples cannot always be distinguished by the form of the fruit;23 some pears look very much like some apples, e.g. the nashi pear.2425

History

Pear cultivation in temperate climates extends to the remotest antiquity, and evidence exists of its use as a food since prehistoric times. Many traces have been found in prehistoric pile dwellings around Lake Zurich.26 Pears were cultivated in China as early as 2000 BC.27 An article on Pear tree cultivation in Spain is brought down in Ibn al-'Awwam's 12th-century agricultural work, Book on Agriculture.28

The word pear, or its equivalent, occurs in all the Celtic languages, while in Slavic and other dialects, differing appellations still referring to the same thing are found—a diversity and multiplicity of nomenclature, which led Alphonse Pyramus de Candolle to infer a very ancient cultivation of the tree from the shores of the Caspian to those of the Atlantic.29

The pear was also cultivated by the Romans, who ate the fruits raw or cooked, just like apples.30 Pliny's Natural History recommended stewing them with honey and noted three dozen varieties. The Roman cookbook De re coquinaria has a recipe for a spiced, stewed-pear patina, or soufflé.31 Romans also introduced the fruit to Britain.32

Pyrus nivalis, which has white down on the undersurface of the leaves, is chiefly used in Europe in the manufacture of perry (see also cider).333435 Other small-fruited pears, distinguished by their early ripening and globose fruit, may be referred to as P. cordata, a species found wild in southwestern Europe.363738

The genus is thought to have originated in present-day Western China39 in the foothills of the Tian Shan, a mountain range of Central Asia, and to have spread to the north and south along mountain chains, evolving into a diverse group of over 20 widely recognized primary species.40 The enormous number of varieties of the cultivated European pear (Pyrus communis subsp. communis), are likely derived from one or two wild subspecies (P. c. subsp. pyraster and P. c. subsp. caucasica), widely distributed throughout Europe, and sometimes forming part of the natural vegetation of the forests.4142 Court accounts of Henry III of England record pears shipped from La Rochelle-Normande and presented to the king by the sheriffs of the City of London.43 The French names of pears grown in English medieval gardens suggest that their reputation, at the least, was French; a favoured variety in the accounts was named for Saint Rieul of Senlis, Bishop of Senlis in northern France.44

Asian species with medium to large edible fruit include P. pyrifolia, P. ussuriensis, P. × bretschneideri, and P. × sinkiangensis.45 Small-fruited species, such as Pyrus calleryana, may be used as rootstocks for the cultivated forms.4647

Subdivision

The genus can be divided into two subgenera—Pyrus and Pashia. Subgenus Pyrus, the Occidental clade, is distributed mainly in the western portion of Eurasia and North Africa, while subgenus Pashia, the Oriental clade, is native to East Asia. The two subgenera come in contact in Xingjiang, China, and in fact P. sinkiangensis appears to have arisen from a hybridisation event between P. communis and either P. pyrifolia or P. bretschneideri, i.e. a hybridisation between a member of the Occidental clade and a member of the Oriental clade.48 As of December 2024, Plants of the World Online accepts the following 74 species.49

Species and selected hybrids

Subgenus Pyrus Subgenus Pashia Not classified
  • Pyrus alpinotaiwaniana

Cultivation

According to Pear Bureau Northwest, about 3,000 known varieties of pears are grown worldwide.50 The pear is normally propagated by grafting a selected variety onto a rootstock, which may be of a pear or quince variety. Quince rootstocks produce smaller trees, which is often desirable in commercial orchards or domestic gardens. For new varieties the flowers can be cross-bred to preserve or combine desirable traits. The fruit of the pear is produced on spurs, which appear on shoots more than one year old.51

There are four species which are primarily grown for edible fruit production: the European pear Pyrus communis subsp. communis cultivated mainly in Europe and North America, the Chinese white pear (bai li) Pyrus × bretschneideri, the Chinese pear Pyrus ussuriensis, and the Nashi pear Pyrus pyrifolia (also known as Asian pear or apple pear), which are grown mainly in eastern Asia.52 There are thousands of cultivars of these three species.53 A species grown in western China, P. sinkiangensis, and P. pashia, grown in southern China and south Asia, are also produced to a lesser degree.5455

Other species are used as rootstocks for European and Asian pears and as ornamental trees.5657 Pear wood is close-grained and has been used as a specialized timber for fine furniture and making the blocks for woodcuts.5859 The Manchurian or Ussurian Pear, Pyrus ussuriensis (which produces unpalatable fruit primarily used for canning) has been crossed with Pyrus communis to breed hardier pear cultivars.60 The Bradford pear (Pyrus calleryana 'Bradford') is widespread as an ornamental tree in North America, where it has become invasive in regions.616263 It is also used as a blight-resistant rootstock for Pyrus communis fruit orchards.6465 The Willow-leaved pear (Pyrus salicifolia) is grown for its silvery leaves, flowers, and its "weeping" form.6667

Cultivars

Main article: List of pear cultivars

The following cultivars have gained the Royal Horticultural Society's Award of Garden Merit:68

The purely decorative cultivar P. salicifolia 'Pendula', with pendulous branches and silvery leaves, has also won the award.76

Harvest

Summer and autumn cultivars of Pyrus communis, being climacteric fruits, are gathered before they are fully ripe, while they are still green, but snap off when lifted.7778 Certain other pears, including Pyrus pyrifolia and P. × bretschneideri, have both climacteric and non-climacteric varieties.798081

Diseases and pests

Main articles: List of pear diseases and Lepidoptera

Pear production – 2022
Country(Millions of tonnes)
 China19.3
 United States0.58
 Argentina0.57
 Turkey0.55
 Italy0.52
World26.3
Source: FAOSTAT82

Production

Main article: List of countries by pear production

In 2022, world production of pears was 26 million tonnes, led by China with 73% of the total (table).83 About 48% of the Southern Hemisphere's pears are produced in the Patagonian valley of Río Negro in Argentina.84

Storage

Pears may be stored at room temperature until ripe.85 Pears are ripe when the flesh around the stem gives to gentle pressure.86 Ripe pears are optimally stored refrigerated, uncovered in a single layer, where they have a shelf life of 2 to 3 days.87

Pears ripen at room temperature. Ripening is accelerated by the gas ethylene.88 If pears are placed next to bananas in a fruit bowl, the ethylene emitted by the banana causes the pears to ripen.89 Refrigeration will slow further ripening. According to Pear Bureau Northwest, most varieties show little color change as they ripen (though the skin on Bartlett pears changes from green to yellow as they ripen).90

Uses

Cooking

Pears are consumed fresh, canned, as juice, and dried. The juice can also be used in jellies and jams, usually in combination with other fruits, including berries. Fermented pear juice is called perry or pear cider and is made in a way that is similar to how cider is made from apples.9192 Perry can be distilled to produce an eau de vie de poire, a colorless, unsweetened fruit brandy.93

Pear purée is used to manufacture snack foods such as Fruit by the Foot and Fruit Roll-Ups.949596

The culinary or cooking pear is green but dry and hard, and only edible after several hours of cooking. Two Dutch cultivars are Gieser Wildeman (a sweet variety) and Saint Remy (slightly sour).97

Timber

Pear wood is one of the preferred materials in the manufacture of high-quality woodwind instruments and furniture, and was used for making the carved blocks for woodcuts. It is also used for wood carving, and as a firewood to produce aromatic smoke for smoking meat or tobacco. Pear wood is valued for kitchen spoons, scoops and stirrers, as it does not contaminate food with color, flavor or smell, and resists warping and splintering despite repeated soaking and drying cycles. Lincoln98 describes it as "a fairly tough, very stable wood... (used for) carving... brushbacks, umbrella handles, measuring instruments such as set squares and T-squares... recorders... violin and guitar fingerboards and piano keys... decorative veneering." Pearwood is the favored wood for architect's rulers because it does not warp. It is similar to the wood of its relative, the apple tree (Malus domestica) and used for many of the same purposes.99

Nutrition

Raw pear is 84% water, 15% carbohydrates and contains negligible protein and fat (table). In a 100 g (3+1⁄2 oz) reference amount, raw pear supplies 239 kilojoules (57 kilocalories) of food energy, a moderate amount of dietary fiber, and no micronutrients in significant amounts (table).

Research

A 2019 review found preliminary evidence for the potential of pear consumption to favorably affect cardiovascular health.100

Cultural references

Pears grow in the sublime orchard of Alcinous, in the Odyssey vii: "Therein grow trees, tall and luxuriant, pears and pomegranates and apple-trees with their bright fruit, and sweet figs, and luxuriant olives. Of these the fruit perishes not nor fails in winter or in summer, but lasts throughout the year."101

"A Partridge in a Pear Tree" is the first gift in the cumulative song "The Twelve Days of Christmas".102

The pear tree was an object of particular veneration (as was the walnut) in the tree worship of the Nakh peoples of the North Caucasus – see Vainakh mythology and see also Ingushetia – the best-known of the Vainakh peoples today being the Chechens of Chechnya. Pear and walnut trees were held to be the sacred abodes of beneficent spirits in pre-Islamic Chechen religion and, for this reason, it was forbidden to fell them.103

See also

Further reading

  • Joan Morgan (2015). The Book of Pears: The Definitive History and Guide to Over 500 Varieties. Chelsea Green Publishing. ISBN 978-1603586665.
  • Media related to Pyrus at Wikimedia Commons
  • Pear at the Wikibooks Cookbook subproject

References

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