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Bulai merupakan penyakit utama pada tanaman jagung yang disebabkan cendawan patogen Peronosclerospora maydis. P. maydis menyebabkan potensi kehilangan hasil mencapai 100%. Berbagai pengendalian yang dilakukan belum memberikan hasil yang optimal dan bahkan menimbulkan dampak negatif terhadap lingkungan dan kesehatan manusia. PGPR Pseudomonas fluorescens diketahui berpotensi sebagai pengendali penyakit bulai yang ramah lingkungan. Penelitian ini bertujuan untuk mengetahui efektivitas P. fluorescens terhadap penekanan penyakit bulai pada tanaman jagung. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) dengan konsentrasi larutan P. fluorescens sebagai perlakuan terdiri dari: P1=0 ml/L, P2=50 ml/L, P3=75 ml/L, P4=100 ml/L, P5=fungisida fenamidon 50%. Hasil penelitian menunjukan bahwa P. fluorescens dapat efektif mengendalikan penyakit bulai, sedangkan perbedaan konsentrasi P. fluorescens tidak memberikan pengaruh yang signifikan dalam pengendalian penyakit bulai pada tanaman jagung. Kata kunci: Penyakit bulai, PGPR,  Pseudomonas fluorescens, tanaman jagung ABSTRACTDowney mildew is the main disease in maize that caused by the fungus pathogen Peronosclerospora maydis. P. maydis caused significant yield loss of up to 100%. The various controls of downey mildew did not bring out succeed and even have a negative impact for the environment and human health. PGPR Pseudomonas fluorescens considered can be used as biological control agents against downy mildew which is environmental friendly. This study aims to determine the effectiveness of P. fluorescens in the controling of downey mildew in maize. Randomized Block Design were used in this research with concentration of P. fluorescens as a treatment consist of:  P1 = 0 ml / L, P2 = 50 ml / L, P3 = 75 ml / L, P4 = 100 ml / L, P5 = fenamidone fungicide 50 %. The results showed that P. fluorescens effective to controling of downy mildew, while differences in P. fluorescens concentration has not significant effect for controlling downy mildew in maize. Keywords: Downy Mildew, PGPR,  Pseudomonas fluorescens, Maize

EFEKTIVITAS PLANT GROWTH PROMOTING RHIZOBACTERIA Pseudomonas fluorescens DALAM PENGENDALIAN HAYATI PENYAKIT BULAI PADA TANAMAN JAGUNG (Zea mays L.)