“DISEASE CONTROL PURPLE BLOTCH (Alternaria Porri L.) USING a PESTICIDEPLANT EXTRACT of BETEL LEAF ON the ONION PLANT (Allium Ceppa L.)”. 2021. Jurnal Agroekoteknologi Terapan 2 (1): 7-10. https://doi.org/10.35791/jat.v2i1.34063.