O, C. C. .; A, D. S.; R, K. E.; O, B. B.; O, O. K. Synergistic Effect of Poultry Manure and Some Botanicals on Cowpea Root-Gall Nematode Infection in a Naturally Infested Soil of Owerri, Imo State, Nigeria. Ca J Agri Crop 2019, 4, 17-25.