France, Sept. 20 -- Ghana is a crucial market for Nigeria's onion industry, importing nearly 100,000 tonnes every year. When hundreds of tonnes of Nigerian onions were seized at Kotoka market in Accra earlier this year, tensions rose quickly.

Several onion seizures took place from April onwards, prompting traders in northern Nigeria to suspend onion deliveries to Ghana.

The dispute centred on the way Nigerian onions were sold on Ghanaian markets, and the prices charged.

Nigerian traders were selling their onions at prices they had set themselves, which angered Ghanaian traders, said David Olujinmi, an economic analyst at SBM Intelligence in Lagos.

"They believe the Nigerians are coming in with their products and driving down prices be...