Genetic Variability among Different Populations of Root Knot Nematodes Based on Their Encumbrance Response to Pasteuria Isolates Using PCR-RFLP oleh Muhammad Kamran, Nazir Javed, Ihsan Ullah, Shahid Nazir, Shakra Jamil, Muhammad Zafar Iqbal, Huma Abbas, Sajid Aleem Khan, Muhammad Ehetisham ul Haq