OKIGBO, R. N.; NMEKA, I. A. Control of yam tuber rot with leaf extracts of <i>Xylopia aethiopica</i> and <i>Zingiber officinale</i>. African Journal of Biotechnology, [S. l.], v. 4, n. 8, p. 804–807, 2005. DOI: 10.4314/ajb.v4i8.15186. Disponível em: https://www.ajol.info/index.php/ajb/article/view/15186. Acesso em: 8 aug. 2026.