NAGARAJAN, S. “Is Puccinia Graminis f.sp. Tritici – Virulence Ug99 a Threat to Wheat Production in the North West Plain Zone of India?*”. Indian Phytopathology 65, no. 3 (July 22, 2012): 219–226. Accessed October 20, 2025. https://epubs.icar.org.in/index.php/IPPJ/article/view/22169.