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The demand for rice as an important food crop in Indonesia is still constrained by the attack of blast disease caused by  Pyricularia grisea . Controlling using synthetic chemical pesticides has a negative impact on the environment so that the use of biological agents is an alternative option. This study aims to determine the effectiveness of several biological agents against the pathogen  P. grisea  that causes blast disease in rice plants in vitro. The study used a completely randomized design (CRD) with 6 levels of treatment and was repeated 3 times using the dooble culture method. The results of the study showed that the inhibition of  P. grisea  was the highest in the treatment of  P. grisea  ×  Trichoderma  sp. and  P. grisea  ×  Gliocladium  sp. namely 67.04% and 51.85% compared to other treatments. The  P. polymyxa  and  P. fluorescence  treatments showed low inhibition, namely 23.70% and 28.89%. Biological agents  Trichoderma  sp. and  Gliocladium  sp. able to inhibit the growth of the fungus  P. grisea . Each biological agent has a different percentage of inhibition in that caused by the inhibitory mechanism of the biological agent.

Efikasi Beberapa Agens Hayati Terhadap Penekanan Pertumbuhan Pyricularia grisea Secara In Vitro