Rohayati Sitanggang, Syamsafitri, and Noverina Chaniago, “IDENTIFICATION AND MORPHOLOGICAL CHARACTERIZATION OF PERONOSCLEROSPORA MAYDIS CAUSING DOWNY MILDEW ON MAIZE IN LANGKAT AND SIMALUNGUN REGENCIES”, IJSET, vol. 4, no. 12, pp. 749–756, Dec. 2025.