ABRAR M. KHAN2, AZMAT ULLAH KHAN1 and. “Incidence and Severity of Cucurbit Powdery Mildew in Uttar Pradesh”. Indian Phytopathology, vol. 45, no. 2, Jan. 2012, pp. 190-3, http://epubs.icar.org.in/index.php/IPPJ/article/view/21605.