DIAMOND Bank Plc, a Nigerian lender, plans to slow lending growth as companies in Africa’s largest economy face an increased risk to earnings from a slump in the naira, Chief Executive Officer Uzoma Dozie said. The bank, which operates in four other West African nations, plans to cut loan growth to 10% this year from 20% in 2014 as “the market is very bearish,” Dozie said during an interview Tuesday in Lagos, the commercial capital.