The White Sapote
Casimiroa edulis La Llave
| Fig. 60. The white sapote (Casimiroa edulis), a common fruit of the Mexican and
Central American highlands, is now grown in California and Florida. (X
1/2) |
In
the highlands of Mexico and Central America, where it is believed to be
indigenous, the white sapote ranks among the principal cultivated
fruits. Outside of this region it is not well known, although it has,
in recent years, attracted attention in California and Florida.
The
Aztecs of ancient Mexico used the term tzapotl to designate soft sweet
fruits such as the sapodilla and its allies. The lack of acidity and
the heavy sweetness of these fruits makes them less acceptable to
palates accustomed to apples and peaches than the mangosteen and
certain other tropical fruits. They are, however, liked by many
northerners, and natives of tropical regions consider them perfect.
The
white sapote is a medium-sized erect or spreading tree, having
palmately compound leaves, small inconspicuous flowers, and yellowish
green fruits the size of an orange. The fruits have a thin membranous
skin, yellowish flesh of soft melting texture and sweet or slightly
bitter flavor, and one to five large oval or elliptic seeds.
In
its native region the white sapote is a fruit of the highlands.
Throughout Mexico and Guatemala it is found at elevations of 2000 to
3000 feet, and occasionally as high as 9000 feet. It is not grown in
regions subject to heavy rainfall.
It has borne fruit at La
Mortola, in southern Italy, and is occasionally seen elsewhere on the
Riviera. It is said also to have fruited in the island of Jersey.
Although introduced into California from Mexico about 1810, it has not
yet become extensively cultivated in that state, and large trees are
rare. One of the oldest, believed to have been planted more than a
century ago, is growing on De La Guerra Street in Santa Barbara. A
number of younger trees, most of them propagated by F. Franceschi and
distributed about 1895, are fruiting in various parts of southern
California; although some of these produce small bitter fruits, others
bear large ones of delicious flavor. In Florida the species has not
been cultivated so long as in California, but it has proved quite
successful in the southern part of the state.
The Aztec name for
this fruit is cochiztzapotl, meaning "sleep-producing sapote." It is
commonly known in Mexico at the present day as zapote bianco (white
sapote). In Guatemala it is called matasano.
The fruit is
usually eaten fresh, but attempts have been made in Central America to
prepare a sweet preserve from it on a commercial scale. Some of the
early writers considered the white sapote unwholesome, and stated that
it would induce sleep if indulged in too freely, but recent experience
does not indicate that there are grounds for such beliefs. Francisco
Hernandez observed that the seed, if eaten raw, was poisonous to
animals and men. An analysis of the fruit made at the University of
California shows it to contain: Water 72.64 per cent, ash 0.44, protein
0.64, total sugars 20.64 (invert sugar 8.44, sucrose 12.20), fat 0.46,
crude fiber 1.26, and starch and the like 3.92.
In its climatic
requirements the tree is distinctively subtropical. It is not
altogether successful in Central America below 3000 feet, and it
thrives at elevations of 5000 to 6000 feet. It is even found in places
which are too high (i.e., too cold) for the avocado. It prefers a
well-drained sandy loam, but may be grown on clay if the drainage is
good, and in Florida it has done well on shallow sandy soils underlaid
with soft limestone. It is drought-resistant, but succeeds much better
in dry regions if irrigated like the orange.
While young, the
tree should be watered liberally to encourage growth, and when it is
about three feet high it should have the terminal bud removed, in order
to induce branching; three or four laterals will develop, and these in
turn, after they have grown to a length of one or two feet, should have
the terminal buds removed. Unless this is done, the tree may grow ten
or twelve feet high before it branches.
Seeds should be planted
as soon as possible after their removal from the fruit in flats of
light porous soil, or singly in three-inch pots, covering them to the
depth of an inch. If the weather is warm, or artificial heat is
provided, germination will take place within three or four weeks. The
young plants should be grown in pots until two or three feet high, when
they may be set out in the open ground.
Seedlings
do not come
into bearing until seven or eight years old, and many produce fruit of
inferior quality. For this reason propagation should be effected by
some vegetative means. Shield-budding is successfully practiced, the
method being essentially the same as with the avocado. Stock plants
should be selected from young vigorous seedlings whose stems are about
3/8 inch in diameter at the base. Budwood is taken from the ends of the
branches, but of fairly well matured wood which has acquired an
ash-gray color. The buds are cut about 1 1/2 inches long, leaving any
wood that may adhere to them, and are inserted in T-incisions, after
which they are bound firmly in place with waxed tape. At the end of two
to four weeks, depending on the weather, they may be unwrapped and then
rewrapped loosely, leaving the bud exposed so that it may start into
growth, at the same time lopping back the stock to a point three or
four inches above the bud. In the tropics budding can probably be done
at almost any season of the year; in California spring and summer, when
the stock plants are in most active growth, are the best times.
Seedling
variation results in some trees being very productive, while others
bear little fruit. No budded trees have yet come into bearing. The
ripening season in Guatemala is April and May; in Florida it is May; in
Mexico it extends from May to July; and in California it begins in
September and ends in November. Because of its thin skin and delicate
texture, the fruit does not ship well, unless picked while still hard
and dispatched so as to reach its destination before it has had time to
soften.
Several horticultural varieties have been described, but
none has been propagated or planted extensively. Harvey and Maechtlen
are two which have been offered by the trade in California; Parroquia
and Gillespie have been described, but not propagated.
Back to White Sapote Page
|