Apple

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The apple is a tree and its pomaceous fruit, of species Malus domestica in the family Rosaceae, and is one of the most widely cultivated tree fruits. It is a small deciduous tree reaching 5-12 m tall, with a broad, often densely twiggy crown. The leaves are alternately arranged, simple oval with an acute tip and serrated margin, slightly downy below, 5-12 cm long and 3-6 cm broad on a 2-5 cm petiole. The flowers are produced in spring with the leaves, white, usually tinged pink at first, 2.5-3.5 cm diameter, with five petals. The fruit matures in the autumn, and is typically 5-8 cm diameter (rarely up to 15 cm).

Botanical origins

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Wild Malus sieversii apple in Kazakhstan

The wild ancestor of Malus domestica is Malus sieversii. It has no common name in English, but is known where it is native as "alma"; in fact, the city where it is thought to originate is called Alma-Ata, or "father of the apples". This tree is still found wild in the mountains of Central Asia in southern Kazakhstan, Kyrgyzstan, Tajikistan, and Xinjiang, China. Some individual M. sieversii, planted by the US government at a research facility recently, resist many diseases and pests that affect domestic apples, and research with it to develop new disease-resistant apples is continuing.

Other species that were previously thought to have made contributions to the genome of the domestic apples are Malus baccata and Malus sylvestris, but there is no hard evidence for this in older apple cultivars. These and other Malus species have been used in some recent breeding programmes to develop apples suitable for growing in climates unsuitable for M. domestica, mainly for increased cold tolerance.

Apples have been a very important food in all cooler climates, and it was probably the earliest tree to be cultivated. To a greater degree than other tree fruit, except possibly citrus, apples store for months while still retaining much of their nutritive value. Winter apples, picked in late autumn and stored just above freezing have been an important food in Asia and Europe for millennia, as well as in Argentina and in the United States since the arrival of Europeans.

The word apple comes from the Old English word aeppel which was used to refer to any round object. This word in turn comes from the Latin word abella, which is the name of a town in Campania. The scientific name malus, on the other hand, comes from the actual Latin word for apple.

Apple cultivars

See List of Apple cultivars for a listing

There are more than 7,500 known cultivars of apples. Different cultivars are available for temperate and subtropical climates. Apples do not flower in tropical climates because they have a chilling requirement.

Commercially-popular apple cultivars are soft but crisp. Other desired qualities in modern commercial apple breeding are a colourful skin, absence of russeting, ease of shipping, lengthy storage ability, high yields, disease resistance, typical 'Red Delicious' apple shape, long stem (to allow pesticides to penetrate the top of the fruit), and popular flavour.

Old cultivars are often oddly shaped, russeted, and have a variety of textures and colours. Many of them have excellent flavour (often better than most modern cultivars), but may have other problems which make them commercially unviable, such as low yield, liability to disease, or poor tolerance for storage or transport. A few old cultivars are still produced on a large scale, but many have been kept alive by home gardeners and farmers that sell directly to local markets. Many unusual and locally important cultivars with their own unique taste and appearance are out there to discover; apple conservation campaigns have sprung up around the world to preserve such local cultivars from extinction.

Although most cultivars are bred for eating fresh (dessert apples), some are cultivated specifically for cooking (cooking apples) or producing cider. Cider apples are typically too tart and astringent to eat fresh, but they give the beverage a rich flavour that dessert apples cannot.

Modern apples are, as a rule, sweeter than older cultivars. Most North Americans and Europeans favour sweet, subacid apples, but tart apples have a strong minority following. Extremely sweet apples with barely any acid flavour are popular in Asia and especially India.

Tastes in apples vary from one person to another and have changed over time. As an example, the U.S. state of Washington made its reputation for apple growing on Red Delicious. In recent years, many apple connoisseurs have come to regard Red Delicious as inferior to cultivars such as Fuji and Gala due to the merely mild flavour and insufficiently firm texture of the Red Delicious.

Growing apples

Apple breeding

In this hybrid of an orchard apple with a red-fruited crabapple cultivar, the pulp of is the same colour as the peel.

Seeds of the above apple, which are same colour as the rest of the fruit.

Like most perennial fruits, apples are ordinarily propagated asexually by grafting. Seedling apples are different from their parents, sometimes radically. Most new apple cultivars originate as seedlings, which either arise by chance or are bred by deliberately crossing cultivars with promising characteristics. The words seedling, pippin, and kernel in the name of an apple cultivar suggest that it originated as a seedling. Apples can also form bud sports (mutations on a single branch). Some bud sports turn out to be improved strains of the parent cultivar. Some differ sufficiently from the parent tree to be considered new cultivars.

Some breeders have crossed ordinary apples with crabapples or unusually hardy apples in order to produce hardier cultivars. For example, the Excelsior Experiment Station of the University of Minnesota has, since the 1930s, introduced a steady progression of important hardy apples that are widely grown, both commercially and by backyard orchardists, throughout Minnesota and Wisconsin. Its most important introductions have included Haralson (which is the most widely cultivated apple in Minnesota), Wealthy, Honeygold, and Honeycrisp. The sweetness and texture of Honeycrisp have been so popular with consumers that Minnesota orchards have been cutting down their established, productive trees to make room for it, a heretofore unheard of practice.

Starting an orchard

Apple orchards are established by planting two to four year old trees. These small trees are usually purchased from a nursery where they are produced by grafting or budding. First, a rootstock is produced either as a seedling or cloned using tissue culture or layering. This is allowed to grow for a year. Then, a small section of branch called a scion is obtained from a mature apple tree of the desired cultivar. The upper stem and branches of the rootstock are cut away and replaced with the scion. In time, the two sections grow together and produce a healthy tree.

Rootstocks affect the ultimate size of the tree. While many rootstocks are available to commercial grower, those sold to homeowners who want just a few trees are usually one of two cultivars: a standard seedling rootstock that gives a full-size tree, or a semi-dwarf rootstock that produces a somewhat smaller tree. Dwarf rootstocks are generally more susceptible to damage from wind and cold. Full dwarf trees are often supported of posts or trellises and planted in high density orchards which are much simpler to culture and greatly increase productivity per unit of land.

Some trees are produced with a dwarfing "interstem" between a standard rootstock and the tree, resulting in two grafts.

After the small tree is planted in the orchard, it must grow for 3-5 years (semi-dwarf) or 4-10 years (standard trees) before it will bear sizable amounts of fruit. Good training of limbs and careful nipping of buds growing in the wrong places, are extremely important during this time, to build a good scaffold that will later support a fruit load.

Location

Apples are relatively indifferent to soil conditions and will grow in a wide range of pH values and fertility levels. They do require some protection from the wind and should not be planted in low areas that are prone to late spring frosts. Apples do require good drainage, and heavy soils or flat land should be tilled to make certain that the root systems are never in saturated soil.

Pollination

Apples are self-incompatible and must be cross-pollinated to develop fruit. Pollination management is an important component of apple culture. Before planting, it is important to arrange for pollenizers, cultivars of apple or crab apple that provide plentiful, viable and compatible pollen. Orchard blocks may alternate rows of compatible cultivars, or may have periodic crab apple trees, or grafted-on limbs of crab apple. Some cultivars produce very little pollen, or the pollen is sterile, so these are not good pollenizers. Quality nurseries have pollenizer compatibility lists.

Growers with old orchard blocks of single cultivars sometimes provide bouquets of crab apple blossoms in drums or pails in the orchard for pollenizers. Home growers with a single tree, and no other cultivars in the neighborhood can do the same on a smaller scale.

During the flowering each season, apple growers usually provide pollinators to carry the pollen. Honeybee hives are most commonly used, and arrangements may be made with a commercial beekeeper who supplies hives for a fee. Orchard mason bees are also used as supplemental pollinators in commercial orchards. Home growers may find these more acceptable in suburban locations because they do not sting. Some wild bees such as carpenter bees and other solitary bees may help. Bumble bee queens are sometimes present in orchards, but not usually in enough quantity to be significant pollinators.

Symptoms of inadequate pollination are small and misshapen apples, slowness to ripen, and low seed count. Well pollinated apples are the best quality, and will have 7 to 10 seeds. Apples having less than 3 seeds will usually not mature and will drop from the trees in the early summer. Inadequate pollination can result from either a lack of pollinators or pollenizers, or from poor pollinating weather at flowering time. It generally requires multiple bee visits to deliver sufficient grains of pollen to accomplish complete pollination.

A common problem is a late frost that destroys the delicate outer structures of the flower. It is best to plant apples on a slope for air drainage, but not on a south facing slope (in the northern hemisphere) as this will encourage early flowering and increase susceptibility to frost. If the frost is not too severe, the tree can be wetted with water spray before the morning sun hits the flowers, and it may save them. Frost damage can be evaluated 24 hours after the frost. If the pistil has turned black, the flower is ruined and will not produce fruit.

Growing apples near a body of water gives an advantage by slowing spring warm up, which retards flowering until frost is less likely. Areas of the USA, such as the eastern shore of Lake Michigan, the southern shore of Lake Ontario, and around some smaller lakes, where this cooling effect of water, combined with good, well-drained soils, has made apple growing concentrations possible in these areas.

Home growers may not have a body of water to help, but can utilize north slopes or other geographical features to retard spring flowering. Apples (or any fruit) planted on a south facing slope in the northern hemisphere (or north facing in the southern hemisphere), will flower early and be particularly vulnerable to spring frost.

Thinning

Apples are prone to biennial bearing. If the fruit is not thinned when the tree carries a large crop, it may produce very little flower the following year. Good thinning helps even out the cycle, so that a reasonable crop can be grown every year.

Pests and diseases

The trees are susceptible to a number of fungal and bacterial diseases and insect pests. Nearly all commercial orchards pursue an aggressive program of chemical sprays to maintain high fruit quality, tree health, and high yields. A trend in orchard management is the use of Integrated Pest Management (IPM), which reduces needless spraying when pests are not present, or more likely, are being controlled by natural predators.

Spraying for insect pests must never be done during flowering because it kills pollinators. Nor should bee-attractive plants be allowed to establish in the orchard floor if insecticides are used. White clover is a component of many grass seed mixes, and many bees are poisoned by insecticides while visiting the flowers on the orchard floor.

Among the most serious disease problems are fireblight, a bacterial disease; and Gymnosporangium rust, apple scab, and black spot, three fungal diseases.

The plum curculio is the most serious insect pest. Others include Apple maggot and codling moth. For other Lepidoptera larvae which feed on apple trees, see List of Lepidoptera which feed on Malus.

Apples are difficult to grow organically, though a few orchards have done so with commercial success, using disease-resistant cultivars and the very best cultural controls. The latest tool in the organic repertoire is to spray a light coating of kaolin clay, which forms a physical barrier to some pests, and also helps prevent apple sun scald.

Harvest

Mature trees typically bear 100-200 kg (5-10 bushels) of apples each year. Apples are harvested using three-point ladders that are designed to fit amongst the branches. A few cultivars, left unpruned, will grow to be extremely large, causing them to bear a great deal of fruit that is difficult to harvest. Dwarf trees will bear about 50-100 kg (3-5 bushels) of fruit per year.

Cultivars vary in their yield and the ultimate size of the tree, even when grown on the same rootstock.

Commerce and uses

45 million metric tons of apples were grown worldwide in 2002, with a value of about 10 billion USD. China produced almost half of this total. Argentina is the second leading producer, with more than 15% of the world production. The United States is the third leading producer, accounting for 7.5% of world production. Turkey is also a leading producer. France, Italy, South Africa and Chile are among the leading apple exporters.

In the United States, more than 60% of all the apples sold commercially are grown in Washington state. Imported apples from New Zealand and other more temperate areas are competing with US production and increasing each year.

Apples can be canned, juiced, and optionally fermented to produce apple juice, cider, vinegar, and pectin. Distilled apple cider produces the spirits applejack and Calvados. Apple wine can also be made. They make a popular lunchbox fruit as well.

Apples are an important ingredient in many winter desserts, for example apple pie, apple crumble, apple crisp and apple cake. They are often eaten baked or stewed, and they can also be dried and eaten or re-consitituted (soaked in water, alcohol or some other liquid) for later use. Puréed apples are generally known as apple sauce. Apples are also made into apple butter and apple jelly. They are also used cooked in meat dishes.

In the UK, a toffee apple is a traditional confection made by coating an apple in hot toffee and allowing it to cool. Similar treats in the US are candy apples (coated in a hard shell of crystallized sugar syrup), and caramel apples, coated with cooled caramel.

Apples are eaten with honey at the Jewish New Year of Rosh Hashanah to symbolize a sweet new year.

Health benefits

Apples have long been considered healthy, as indicated by the proverb an apple a day keeps the doctor away. Research suggests that apples may reduce the risk of colon cancer, prostate cancer and lung cancer. They may also help with heart disease, weight loss and controlling cholesterol.

A group of chemicals in apples could protect the brain from the type of damage that triggers such neurodegenerative diseases as Alzheimer's and Parkinsonism. Chang Y. "Cy" Lee of Cornell University found that the apple phenolics, which are naturally occurring antioxidants found in fresh apples, can protect nerve cells from neurotoxicity induced by oxidative stress. The researchers used red delicious apples grown in New York state to provide the extracts to study the effects of phytochemicals. Lee said that all apples are high in the critical phytonutrients and that the amount of phenolic compounds in the apple flesh and in the skin vary from year to year, season to season and from growing region to growing region (November/December 2004 issue of the Journal of Food Science). The predominant phenolic phytochemicals in apples are quercetin, epicatechin, and procyanidin B2 (PMID 14558772).

Apples are historically known for producing "apple milk". A derivative of apple curd, apple milk is widely used throughout Tibet.

Cultural aspects

Apples as symbols

Apples appear in many religious traditions, often as a mystical and forbidden fruit. One of the Greek hero Heracles' Twelve Labours was to travel to the Garden of the Hesperides and pick the golden apples off the Tree of Life growing at its center. In Norse mythology, Iðunn was the keeper of the 'apples of immortality' which kept the Gods young. The 'fruit-bearing tree' referred to by Tacitus in his description of Norse runic divination may have been the apple, or the rowan. This tradition is also reflected in the book of Genesis. Though the forbidden fruit in that account is not identified, popular European Christian tradition has held that it was an apple that Eve incited Adam to share with her. The influence of the antiquity was still strong, and the pagan symbology was absorbed into the new religion. This tradition was reflected in artistic renderings of the fall from Eden. The larynx in the human throat has been called Adam's apple because of a notion that it was caused by the forbidden fruit sticking in the throat of Adam. Celtic mythology includes a story about Conle who receives an apple which feeds him for a year but also makes him irresistibly desire fairyland.

Another reason for the adoption of the apple as Christian symbol is that in Latin, the words for "apple" and for "evil" are identical (malum). It is often used to symbolize the fall into sin, or sin itself. When Christ is portrayed holding an apple, he represents the Second Adam who brings life. When held in Adam's hand, the apple symbolizes sin. This also reflects the evolution of the symbol in religion. In the Old Testament the apple was significant of the fall of man; in the New Testament it is an emblem of the redemption from that fall, and as such is also represented in pictures of the Madonna and Infant Jesus.

Another Greek mythological figure, Paris, had to give a golden apple inscribed Kallisti "To the most beautiful one", (which had come from the goddess of discord, Eris) to the most beautiful goddess, thus indirectly causing the Trojan War. Atalanta, also of Greek mythology, was distracted during a race by three golden apples thrown for that purpose by a suitor, Hippomenes. In ancient Greece, throwing an apple at a person's bed was an invitation for sexual intercourse. Another instance in Roman and Greek mythology is the story of the Pleiades.

At times artists would co-opt the apple, as well as other religious symbology, whether for ironic effect or as a stock element of symbolic vocabulary. Thus, secular art as well made use of the apple as symbol of love and sexuality. It is often an attribute associated with Venus who is shown holding it.

The ancient Kazakh city of Almaty, 'Father of Apples' (Turkic language alma, apple, + ata, father), owes its name to the forests of wild apples (Malus sieversii) found naturally in the area.

The apple blossom is the state flower of Arkansas and Michigan.

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Yabloko party symbol

The name of the Russian party Yabloko means "apple". Its logo represents an apple in the constructivist style.

Apple Computer and Apple records have also adopted the apple for their companies.

Traditions

Swiss folklore holds that William Tell courageously shot an apple from his son's head with his crossbow, defying a tyrannical ruler and bringing freedom to his people.

Irish folklore claims that if an apple is peeled into one continuous ribbon and thrown behind a woman's shoulder, it will land in the shape of the future husband's initials.

Danish folklore says that apples wither around adulterers.

In some places, bobbing for apples is a traditional Halloween activity. Apples are said to increase a woman's chances of conception as well as remove birthmarks when rubbed on the skin.

In the United States, Denmark and Sweden, an apple (polished) is a traditional gift for a teacher. This stemmed from the fact that teachers during the 16th to 18th centuries were poorly paid, so parents would compensate the teacher by providing food. As apples were a very common crop, teachers would often be given baskets of apples by students. As wages increased, the quantity of apples was toned down to a single fruit.

External links and references

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Complete nutritional info.
Over 700 apple variety listings from AllAboutApples.com
Wild apples in Kazakhstan: 1995 and 1996 expeditions
Over 2000 apples in the UK's National Fruit Collections
U.S Apple Association Guide with some years and places of cultivar origins
Apple Facts from the UK's Institute of Food Research
An article about storing apples and the effects. Good for those interested in shipping apples. from the Agricultural Research Service
Apple flavours and descriptions from OrangePippin.com