MANGO

Forms: The mango exists in two races, one from India and the other from the Philippines and Southeast Asia. The Indian race is intolerant of humidity, has flushes of bright red new growth that are subject to mildew, and bears monoembryonic fruit of high color and regular form. The Philippine race tolerates excess moisture, has pale green or red new growth and resists mildew. Its polyembryonic fruit is pale green and elongated kidney-shaped. Philippines types from Mexico have proven to be the hardiest mangos in California.

Adaptation: Mangos basically require a frost-free climate. Flowers and small fruit can be killed if temperatures drop below 40° F, even for a short period. Young trees may be seriously damaged if the temperature drops below 30° F, but mature trees may withstand very short periods of temperatures as low as 25° F. The mango must have warm, dry weather to set fruit. In southern California the best locations are in the foothills, away from immediate marine influence. It is worth a trial in the warmest cove locations in the California Central Valley, but is more speculative in the coastal counties north of Santa Barbara, where only the most cold adapted varieties are likely to succeed. Mangos luxuriate in summer heat and resent cool summer fog. Wet, humid weather favors anthracnose and poor fruit set. Dwarf cultivars are suitable for culture in large containers or in a greenhouse.

Flowers: The yellowish or reddish flowers are borne in inflorescences which appear at branch terminals, in dense panicles of up to 2000 minute flowers. These flowers respire a volatile substance, causing allergic and respiratory problems for some persons. Pollinators are flies,

hoverflies, rarely bees. Few of the flowers in each inflorescence are perfect, so most do not produce pollen and are incapable of producing fruit. Pollen cannot be shed in high humidity or rain. Fertilization is also ineffective when night temperatures are below 55° F. Mangos are monoecious and self-fertile, so a single tree will produce fruit without cross pollination. Polyembryonic types may not require pollination at all. Branches may be ringed to induce flowering, but the results are mixed.

Fruits: The fruits grow at the end of a long, stringlike stem (the former panicle), with sometimes two or more fruits to a stem. The fruits are 2 to 9 inches long and may be kidney shaped, ovate or (rarely) round. They range in size from 8 ounces to around 24 ounces. The flower scar at the apex is prominent, in some cultivars bulging from the fruit. The leathery skin is waxy and smooth, and when ripe entirely pale green or yellow marked with red, according to cultivar. It is inedible and contains a sap that is irritating to some people. The quality of the fruit is based on the scarcity of fiber and minimal turpentine taste.
The flesh of a mango is peachlike and juicy, with more or less numerous fibers radiating from the husk of the single large kidney-shaped seed. Fibers are more pronounced in fruits grown with hard water and chemical fertilizers. The flavor is pleasant and rich and high in sugars and acid. The seed may either have a single embryo, producing one seedling, or polyembryonic, producing several seedlings that are identical but not always true to the parent type. It is impossible to distinguish true-to-type from zygotic seedlings from the same fruit. Some seedlings produce numerous tiny, parthenocarpic fruits which fail to develop and abort. Mango trees tend to be alternate bearing