Farmers in Nigeria have boosted cocoa production, thanks to a new kind of fast-growing, fungus-resistant bean.

The new type of bean reaches maturity in 18 months instead of four to five years like other types of beans.

The government wants to double production to 500,000 tonnes by next year.

But farmers say not enough is being done to increase yields.

Al Jazeera's Yvonne Ndege reports from the southwest state of Ondo.