EKSPLORASI BAKTERI RHIZOSFER ASAL PERAKARAN ALANG-ALANG TERHADAP PENGENDALIAN LAYU FUSARIUM TIGA VARIETAS PISANG SECARA IN VITRORina SilvianaRiantikaauthorhis research was conducted at the Soil and Agroclimate Laboratory Department of Agroecotechnology Faculty of Agriculture Sultan Ageng Tirtayasa University, from March until May 2025. This research was a quantitative research that used exploratory and experimental methods, employing a completely randomized factorial design, with the first factor being bacterial isolates from alang-alang roots and the second factor being Fusarium wilt fungi from banana varieties, consisting of three replicates with 27 experimental units. The results of this research showed that the fungi found in the three banana varieties were the same type of fungus, namely Fusarium oxysporum f.sp. cubense. This research found that rhizosphere bacteria from alang-alang roots around the Uli variety showed significant results in inhibiting the growth of Fusarium wilt fungus in vitro. Fusarium wilt fungus from the Uli banana variety had great potential to be inhibited by rhizosphere bacteria from alang-alang roots. This was because the inhibition value obtained by Fusarium wilt fungi originating from Uli banana varieties showed the highest value, namely 54.40% (one day after stale), 36.11% (two days after stale), 46.90% (three days after stale), 43.18% (four days after stale), 43.27% (five days after stale), 45.43% (six days after stale), and 47.06% (seven days after stale) and there was an interaction between rhizosphere bacteria from alang-alang roots and Fusarium wilt fungi from three banana varieties on the first day after incubation, but there were no interaction from the second until the seventh day after incubation to all parameters observed. Keywords: Rhizosphere bacterial, Fusarium oxysporum f.sp cubense, in vitro.S Agriculture (General)SB Plant culture2025-12-17UNIVERSITAS SULTAN AGENG TIRTAYASA;AGRICULTUREThesis