M.S. CHANDAWAT, B.S. RATHORE* and. “Influence of Irrigation, Row Orientation and Nitrogen on Downy Mildew of Blond Psyllium”. Indian Phytopathology, vol. 56, no. 4, Nov. 2003, pp. 453-6, https://epubs.icar.org.in/index.php/IPPJ/article/view/18447.