sentences:  The bark of the tree is also used as an ingredient in traditional medicines and the shell of nut is said to be able to repel mosquitoes and is also said to protect existing trees.The Bambara groundnut ("Vigna subterranea") is also grown in abundance; Burkina Faso produced some 20,000 tonnes in 1989, after peanuts (160,000 tonnes) and cowpeas (74,000 tonnes).Between 1982 and 1985, an attempt was made to improve the Bambara groundnut, an initiative which involved the participation of plant breeders in the Grain Legumes Programme.