Abiu is a fruit-bearing tree originating in the humid forests of the Amazon, its natural range extending across large parts of Peru and Brazil. It is closely related to the Star Apple (Chrysophyllum cainito) and Sapodilla, (Manilkara zapota), and has long been cultivated on a limited basis in its native South America, more recently in South Florida, Malaysia and northern Australia.
It ia a fast-growing tree and may reach heights of 15 m (50 ft) or more in its natural habitat, though is more typically 5 to 10 m (15 to 30 ft) tall with a short trunk and a densely branched, wide-spreading rounded crown. The bark is grey or brown, smooth on young trees becoming rough and cracked with age. All parts of the tree, with the exception of the leaves and flowers, exude a sticky white latex when wounded.
The leaves are up to 25 cm (10 in) long, lance-shaped, tapering to points at both ends, glossy green on top and arranged alternately in clusters at the ends of the branches. They are evergreen, persisting on the tree in all seasons.
The flowers are small, white and mostly bisexual, with both female and male parts. They are borne singly or in clusters of up to eight directly on the branches and bloom at their fullest from spring to summer, with light blooms at other times in constantly humid areas.
The flowers are followed by nippled egg-shaped fruit of variable size, ranging from 5 to 12 cm (2 to 5 in) in diameter. They mature around three months after fruit-set, usually from summer to autumn in its native range, but with some fruit produced nearly year-round in constantly humid areas. When ripe they are bright yellow with a smooth, thin, leathery rind enclosing soft, jelly-like pulp. At the centre sit one to four large, smooth, brown oval seed.
The ripe fruit pulp is eaten fresh out-of-hand or is spooned out and used in chilled desserts. It is soft, white to cream-coloured, translucent and somewhat jelly-like, with a sweet, subtle caramel-like flavour. Care is taken to avoid the sticky latex found close to the rind on the inside of the fruit.
The fruit pulp contains very high levels of Vitamin C (Ascorbic acid) and good levels of Vitamin B3 (Niacin).
Abiu grows and fruits naturally in humid tropical lowland climates, generally in frost-free areas with annual lows of 17 to 25 °C, annual highs of 25 to 35 °C, annual rainfall of 1300 to 4000 mm and a dry season of 5 months or less. However, it may fail to thrive in areas where the average low of the coldest month is below 10 °C (50 °F).
New plants are mostly started from cuttings or seed, with each method having its own advantages and disadvantages. Cuttings exude a sticky latex which makes them difficult to propagate and the seed do not always come true to type, sometimes producing fruit with different characteristics to the parent. Also, the seed lose their viability quickly, usually one to two days after extraction from the fruit.
It performs best on rich, free-draining clay and loam soils of a moderately acid to neutral nature, generally with a pH of 5.5 to 7.5 and on site with full to partial sun exposure. It has poor tolerance to salt spray, soil salt and limestone soil conditions.
It is an early maturing, heavy bearing fruit tree, with some six-year-old trees reportedly yielding up to five hundred fruit a year and with flowering and fruiting starting in trees as young as two to three year old. Mulching to minimise water stress during dry periods and periodic applications of potassium and phosphorus rich manures help to increase survival rates and improve fruit production and quality.
It produces a large number of fruit and the seed, although short-lived survive passage through an animal's gut. At least one reference publication lists it as a weed, but there does not appear to be any record of it as a serious weed anywhere in the world. It is assessed to be a low weed risk species for Hawaii by the Hawaii Pacific Weed Risk Assessment project (HPWRA).
Food and Agriculture Organization of the United Nations (FAO) 1986, Food and Fruit-bearing Forest Species, 3 : Examples from Latin America, FAO Forestry Paper no 44/3, Rome
Janick, J., & Paull, R. E. 2008, The encyclopedia of fruit & nuts, CABI Publishing, Wallingford, Oxfordshire
Macmillan, H. F. 1943, Tropical planting and gardening : with special reference to Ceylon, 5th ed, Macmillan Publishing, London
Martin, F. M., et al. 1987, Perennial edible fruits of the tropics : an inventory, U.S. Dept. of Agriculture (USDA), Agricultural Research Service, U.S. Government Printing Office (GPO), Washington, D.C.
Morton, J. F. & Dowling, C. F. 1987, Fruits of warm climates, Creative Resources Systems, Winterville, North Carolina
Norrington, L. & Campbell, C. 2001, Tropical food gardens : a guide to growing fruit, herbs and vegetables in tropical and sub-tropical climates, Bloomings Books, Hawthorn, Victoria
Page, P. E. 1984, Tropical tree fruits for Australia, Queensland Department of Primary Industries (QLD DPI), Brisbane
Queensland Department of Primary Industries and Fisheries (QLD DPI) 2008, Queensland tropical fruit : the healthy flavours of North Queensland, Brisbane
Randall, R. P. 2007, The introduced flora of Australia and its weed status, Cooperative Research Centre for Australian Weed Management, Glen Osmond, South Australia
Watson, B.J., & Moncur, M. 1985, Guideline criteria for determining survival, commercial and best mean minimum July temperature for various tropical fruit in Australia (Southern Hemisphere), Department of Primary Industries Queensland (DPI QLD), Wet Tropics Regional Publication, Queensland
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