Yams are among the most important staple foods
in the world, especially in some parts of the tropics and subtropics. The role
played by yam in the food economy in most West African countries cannot be
over-emphasized. It is one of the most important dietary sources of energy
produced within the tropics. Nigeria produces yams for local consumption and
the export market.
The country is a leading exporter of yam in
the world. Water yams are consumed when white yam becomes scarce or expensive. One of the most pressing problems facing the
countries of the
third world is food scarcity. It is reported that nearly 1 billion people are
challenged by severe hunger in these nations of which 10% die from
hunger-related complications.
A substantial part of this problem from hunger
stems from inadequate agricultural storage and produce preservation from
microbes-induced spoilages. According to Arya, of all losses caused by plant
diseases, those that occur after harvest are the costliest. Cassava, yam and
sweet potato are important sources of food in the tropics. Others are cocoyam,
rice, maize, wheat, sorghum, millet and various fruits, legumes and vegetables.
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