Mokalu, N. and Kaligis, J.B. 2021. DISEASE CONTROL PURPLE BLOTCH (Alternaria porri L.) USING a PESTICIDEPLANT EXTRACT of BETEL LEAF ON the ONION PLANT (Allium ceppa L.). Jurnal Agroekoteknologi Terapan. 2, 1 (Mar. 2021), 7–10. DOI:https://doi.org/10.35791/jat.v2i1.34063.