In spite of their wide geographic distribution, the various species in the genus Pyrus are intercrossable without major incompatibility barriers. Also, the high morphological diversity and the lack of distinguishing characters among the species have been reported. Therefore, the classification of species in this genus is problematic and often confusing, giving different populations designated as different species by some authors. It is likely that, when the genus is reviewed, there will be several changes to the nomenclature[].

Common Name: White Pear

General Information

Pyrus bretschneideri is a deciduous tree that can grow 5 - 15 metres tall[, ].
This species has a long history of cultivation for its edible fruit in northern China, and is also grown in Japan, central Asia and the USA. It includes many important forms with excellent quality fruit[, ].

Known Hazards

Although no specific information has been seen for this plant, the seed of many species in the family Rosaceae are likely to contain cyanogenic glycosides. When injested, these compounds break down in the digestive tract to release cyanide. Used in small quantities in both traditional and conventional medicine, this exceedingly poisonous compound has been shown to stimulate respiration, improve digestion, and promote a sense of well-being[]. It is also claimed by some to be of benefit in the treatment of cancer - though this claim has been largely refuted.
In larger concentrations, however, cyanide can cause gasping, weakness, excitement, pupil dilation, spasms, convulsions, coma and respiratory failure leading to death[].
The levels of toxin can be detected by the level of bitterness:- sweet almonds, for example, contain only very low levels of it and are safe to eat in quantity, whilst bitter almonds (which are used as a flavouring in foods such as marzipan) contain much higher levels and should only be eaten in very small quantities. Great caution should be employed if the taste is moderately to very bitter[].

Botanical References

,

Range

E. Asia - central China (Gansu, Hebei, Henan, Shaanxi, Shandong, Shanxi, Xinjiang).

Habitat

Slopes, dry cold regions; at elevations from 100 - 2,000 metres[].

Properties

Edibility Rating
Habit	Deciduous Tree
Height	6.00 m
Pollinators	Insects
Cultivation Status	Cultivated, Wild

Cultivation Details

Pyrus bretschneideri is a very cold-hardy plant, tolerating temperatures down to at least -15°c when dormant[].
Prefers a good well-drained loam in full sun[]. Grows well in heavy clay soils. Tolerates light shade but does not fruit so well in such a position. Tolerates atmospheric pollution, excessive moisture and a range of soil types if they are moderately fertile[]. Established plants are drought tolerant[].
This species is closely related to Pyrus ussuriensis ovoidea[].
The plant is commonly cultivated as a fruit crop in northern China, preferring sunny, dry, loamy soils. It includes many important forms with excellent fruit[].

Edible Uses

Fruit - raw or cooked[, ]. An excellent flavour and succulent, juicy flesh. Mainly eaten fresh close to the point of harvest, though some cultivars can be stored for later use[]. The ovoid to subglobose fruit is yellow with fine dots, it can be 20 - 30mm in diameter[, ].

Medicinal

None known

Other Uses

None known

Propagation

Seed - best sown in a cold frame as soon as it is ripe in the autumn, it will then usually germinate in mid to late winter. Stored seed requires 8 - 10 weeks cold stratification at 1°c and should be sown as early in the year as possible[]. Temperatures over 15 - 20°c induce a secondary dormancy in the seed[]. Prick out the seedlings into individual pots when they are large enough to handle and grow them on in light shade in a cold frame or greenhouse for their first year. Plant them out in late spring or early summer of the following year.