“Effect of Different Dates of Sowing Cowpea on the Severity of Leaf Rust Caused by Uromyces Phaseoli Var. Vignea”. Tropical Agriculture 66, no. 2 (April 30, 1989). Accessed April 26, 2025. https://journals.sta.uwi.edu/ojs/index.php/ta/article/view/1850.