By Beatrice Gachenge Reuters November 29, 201 NAIROBI (Reuters) - Africa's coffee output could leap by a third within the next five years as farmers scramble to replace mature trees with disease-resistant seeds to cash in on soaring global prices for the beans, a senior industry official said. Poor prices, drought, disease and political instability in major producers such as Ivory Coast have led to neglect of coffee farms, while some farmers ditched the commodity in favour of planting staple foods such as maize. But Denis Seudieu, chief economist at the International Coffee Organisation, told Reuters that countries like Uganda, Kenya, Cameroon and Tanzania have come up with hardier seedlings that produce higher yields, and are reaching out to new markets. "If major producing countries aggressively implement and rehabilitate the coffee sector by supporting and trickling benefits to farmers, we are optimistic in five years production will increase by ...