Puspita Sari, A. and Marsuni, Y. 2026. The Effectiveness of Kratom Leaf Extract (Mitragyna speciosa Korth) in Suppresses Ralstonia syzygii subsp. indonesiansis in Vitro. JURNAL PROTEKSI TANAMAN TROPIKA. 9, 1 (Feb. 2026), 1342–1349. DOI:https://doi.org/10.20527/jptt.v9i1.3665.