NAGARAJAN S. Is Puccinia graminis f.sp. tritici – virulence Ug99 a threat to wheat production in the North West Plain Zone of India?*. Indian Phytopath. 2012;65(3):219-226. Accessed October 20, 2025. https://epubs.icar.org.in/index.php/IPPJ/article/view/22169