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Green-Seeds.com
Fruits
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ACEROLA
Malpighia punicifolia L.
Malpighiaceae
 Common Names: Barbados
Cherry, West Indian Cherry, Cereza, Cerisier, Semeruco
Related Species: Mapighia
punicifolia has been renamed M. emarginata by recent authorities. Acerola
is listed under M. glabra in the Index of CRFG Publications, 1969-1989.
Distant Affinity: Ciruela
del Monte (Bunchosia argentea), Ciruela Verde (Bunchosia armeniaca), Nance
(Byrsonima crassifolia)
Origin: The acerola
is believed to originate from the Yucatan (linguistic evidence) and is distributed
from South Texas, through Mexico (especially on the West Coast from Sonora
to Guerrero) and Central America to northern South America (Venezuela, Surinam,
Columbia) and throughout the Caribbean (Bahamas to Trinidad). Acerola has
now been successfully introduced in sub-tropical areas throughout the world
(Southeast Asia, India, South America), and some of the largest plantings
are in Brazil.
Adaptation: The acerola
is typically found in dry, thorn-woodlands as a deciduous tree. It grows
in San Diego County, coastal Southern California and in more extreme areas
with protection. There are trees in Riverside, Calif. and San Bernardino
County. In general, acerola has poor cold tolerance, with young plants typically
killed at temperatures below 30° F. Trees can survive brief exposure
to 28° F with loss of leaves. Trees are sensitive to wind (shallow root
systems). The acerola is drought tolerant, and will adopt a deciduous habit;
irrigation results in leaf and
flower flush. Plants can easily adapt to pot culture in well-draining,
limed soil.
DESCRIPTION 
Growth Habit: Large,
relatively fast growing bushy shrub or small tree (to 15 feet). Can be pruned
to any desired shape, but grows best as a managed shrub. Multiple or single
trunks which can be trained. Occasionally, bushes appear to be composed
of canes. Branches are brittle, and easily broken. Leaves may be irritating
to some people. The root system is shallow, and trees can be toppled by
wind, but they can be uprighted and recover over time
Foliage: Acerola leaves
are dark to light green, glossy when mature, obviate to lanceolate, with
minute hairs which can be irritating. Foliage will drop during water stress,
but recovers well with flush and flowering.
Flowers: The flowers
are sessile or on short-peduncled cymes, with small pink to white flowers
with five petals. Up to 90% of flowers fall from tree, but "Blossom Set"
can be used to counter this effect. Flowering can occur throughout the year,
but is typically in cycles associated with rain. Irrigation can be used
to induce flowering.
Flowering occurs primarily on old growth. Pollination rarely observed,
but thought to be by the solitary bee, Centris. Honeybees do not appear
effective (contested). Cross-pollination may or may not be required depending
on variety or strain (contested). In available cultivars, fruit does set
without obvious pollinators or need for cross-pollination.
Fruit: Fruits are round
to oblate, cherry-like but with 3 lobes. They are bright red (rarely yellow-orange)
with thin skin, easily bruised. The pulp is juicy, acid to sub-acid occasionally
nearly sweet, with a delicate flavor and apple notes. The fruit is very
high in Vitamin C, up to 4,000 mg per 100 g fresh weight, but typically
around 1,500 mg C. Green fruits have twice the Vitamin C level of mature
fruits. Fruits develop to maturity in less than 25 days. Seeds typically
three with fluted wings, forming a triangle. Many aspects of seed viability
have not been studied.
CULTURE
Location: The plant
prefers full sun for fruit development, giving rise to the problem of winter
protection in harsher climates. Shaded trees fruit, but at reduced fruit
densities, and the plants themselves become somewhat spindly. Due
to its shallow and smaller root system, acerola can be interplanted with
other crops more closely than many trees.
Soil: Acerolas grows
in marl, limestone, clay and other heavy soils as long as it drains well;
waterlogging of roots will cause plant death. Soil pH should be 6.5-7.5
as acid soils do not promote vigorous growth. Liming of trees and working
into the soil is a common practice and necessary for high productivity.
Irrigation: The acerola
does best with 1000-2000 mm of water. However, as mentioned, acerola is
drought-tolerant. Irrigation can be used to cause flowering and can regulate
flower cycles. Under good constant irrigation, acerola will flower all year,
with between 1 and 3 flowering peaks. Acerola does well with both overhead
and drip irrigation.
Fertilization: Acerolas
requires a good, balanced fertilization schedule, and regular (once a year)
liming of soil. Foliar sprays are very effective, and are used commercially.
Mineral nutrition is very important, with good levels of boron and iron
required.
Pruning: The plant will
tolerate heavy pruning, but requires time for recovery. In more tropical
areas, plants do not seem overly affected by pruning. Plants are pruned
commercially with citrus pruners. Can be kept as a small bush (e.g. 5 ft)
and will produce well.
Frost Protection: As
with most frost-sensitive plants, the acerola will need some protection
when grown in areas were frost can occur. Growing with overhead protection
or growing next to a wall or building may be sufficient, but the plant may
also be covered with heavy cloth or plastic sheeting draped over a frame
for added protection. Container grown plants can be moved too a frost secure
area.
Propagation: Acerolas
can be propagated by seed, cutting, grafting, and other standard methods.
The plant does not appear stringent in its requirements. Seed viability
can be very low; in some groves, seedlings are never observed.
Cuttings are considered the simplest method of propagation and, with the
use standard IBA hormone, give near 100% success rates. Grafting onto
rootstocks has not been systematically studied, although grafts onto Byrsonima
crassifolia rootstock have been successful.
Pests and Disease: The
Acerola is susceptible to root-knot nematode (Meloidogyne spp.) which causes
serious problems with young trees and slower losses of productivity in older
trees. It is also attacked by a variety of common insects, such as aphids,
whitefly and scale. In other areas of the world (Mexico, Caribbean) weevils
(Anthonomus spp.) are serious pests, and can limit fruit production. In
tropical areas, Cercospora fungi can be a major cause of disease.
Harvest: The fruit deteriorates
rapidly once removed from tree; sensory differences can be noted within
4 hours. The fruit undergoes rapid fermentation, and is typically unusable
by 3-5 days. Unrefrigerated fruit develops mold quickly. The best uses are
direct eating, jams and jellies, and syrups. Juices, which are popular in
Brazil, do not hold their sensory characteristics for extended periods.
The fruit has also been used for baby food, as a supplement source for Vitamin
C, as an ice cream and pop-sickle ingredient, and in many home recipes.
Frozen fruit falls apart when thawed.
In the tropics, there
are typically 3 harvest periods per year. In more temperate areas, one and
possibly 2 harvests occur. With regular irrigation, some fruit production
may occur through much of the year. Eight year old trees can yield from
30 to 60 pounds of fruit. From seed, plant can fruit in the 2nd or 3rd year;
cuttings may fruit in the first year. Productivity increases over a 15 to
20 year period, and then levels or declines. Forty year old productive trees
are known in southern Florida.
Commercial Potential:
Plantings of acerola are increasing worldwide, with Brazil leading the way.
The increased plantings are a direct result of increased use of acerola
for a natural source of Vitamin C for nutritional supplements.
CULTIVARS
B-17
A common variety. High in vitamin
C and subacid to acid.
Dwarf
A low-growing cultivar, to about
2 ft. tall. Grows well in a hanging basket. Can take colder weather than
others, to 22° F.
Florida Sweet
A common California variety. Fruit
large, 1-1/4 inches in diameter. Skin thick. Flesh very juicy, flavor
applelike, semisweet. Vitamin C content
about 1,500 to 2,000 mg. per 100 mg. Tree erect, with open-type
growth and outstanding yields. Originated
in Homestead, FL by the Florida Sub-Tropical Engineering
Station.
Manoa Sweet
Orange-red fruit of the sweet type.
Tree upright, spreading, very productive. Originated in Honolulu, HA by
Henry Y. Nakasone, University of
Hawaii. Introduced in 1963.
Other named
varieties include: Beaumont, Haley, Hawaiian Queen, Maunawili, Red Jumbo,
Rehnborg and Tropical
Ruby. Varieties other than B-17 and Florida Sweet are not often encountered
in Southern California, although several
are now available from Pacific Tree Farms, Chula Vista, CA.
FURTHER READING
Cooper, F. The acerola comes to California loaded with vitamin C. CRFG
Yearbook 3, 1971, pp 2-8.
Facciola, Stephen. Cornucopia: a
Source Book of Edible Plants. Kampong Publications, 1990. p. 127.
Morton, Julia F. Fruits of Warm Climates,
Julia F. Morton, Publisher, 1987, pp. 204-209.
© Copyright
1996, California Rare Fruit Growers, Inc.
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Tel: +84 (8) 847 6901 - Fax: +84 (8) 844 1392 - Email: info@green-seeds.com
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