Gibson, R W, and W W Page. “The Determination of When Maize Plants Were Infected With Maize Streak Virus from the Position of the Lowest Diseased Leaf”. African Crop Science Journal 5, no. 2 (February 1, 1997). Accessed September 28, 2026. https://www.ajol.info/index.php/acsj/article/view/27860.