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), pp. 1342–1349. doi: 10.20527/jptt.v9i1.3665.