ABSTRACT Preliminary study on the fungicidal effect of butterfly pea flower (Clitoria ternatea L.) against Fusarium oxysporum f.sp. cepae, the causal agent of moler diseases on shallot Butterfly pea (Clitoria ternatea) has been known worldwide to possess numerous anti microbe substances, both against bacteria, fungi, nematodes, and insects. Researches were mostly conducted against human microbial pathogens, whereas only a few against plant pathogens, especially in Indonesia. A preliminary study has been carried out to reveal the fungicidal effects of flower extract in inhibiting the in-vitro growth of Fusarium oxysporum f.sp. cepae (FOC), the causal agent of moler diseases, one of the most destructive diseases on shallot. Results showed that the boiling extract of flower of butterfly pea at 5% concentration inhibited 46% the growth of FOC over control. Key words: Fungicidal effect, Cliteria ternatea, Fusarium oxysporum f.sp. cepae, In-vitro ABSTRAK Kembang telang (Clitoria ternatea) sudah lama dikenal di seluruh dunia mengandung berbagai senyawa antimikroba, baik terhadap bakteri, jamur, nematoda. bahkan insekta. Target utama patogen yang banyak diteliti adalah terhadap patogen penyakit pada manusia. Penelitian terhadap patogen tanaman, terutama di Indonesia masih sangat kurang. Uji pendahuluan sudah dilakukan untuk mengetahui efek fungisidal bunga kembang telang dalam menghambat pertumbuhan in-vitro jamur Fusarium oxysporum f.sp. cepae (FOC), penyebab penyakit moler yang sangat merugikan pada tanaman bawan merah. Hasil pengujian menunjukkan bahwa air rebusan bunga kembang telang memiliki kemampuan dalam menghambat pertumbuhan biakan FOC. Pada konsentrasi 5%, efek penghambatannya mencapai 46% terhadap kontrol. Kata kunci: Efek fungisida, Cliteria ternatea, Fusarium oxysporum f.sp. cepae, In-vitro