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Bacterial Leaf Blight Disease caused by bacteria  Xanthomonas oryzae  pv.  Oryzae  is an endemic disease found in all rice plantation in Indonesia. The bacteria infects plants from the vegetative to generative phase and is able to reduce production by up to 30%. Most of farmers control the disease by using chemical pesticides that cause pollution to the environment. While this study offers control by using biological pesticides with the bacteria  Paenibacilus polymyxa  Mace. The research aims to control Bacterial Leaf Blight Disease using  P. polymyxa  Mace in several varieties of rice plants ( Oryza sativa  L.) as well as to obtain effective concentrations of  P. polymyxa  Mace Bio agent to control Bacterial Leaf Blight Disease. Experiments were conducted using Split-plot design with 3 (three) replication. The main plot was the Concentration of  P. Polymyxa  Mace consist of 4 levels, they were P0=Control/Untreated, P1=2.5 mL.L-1 water, P2=5 mL.L-1 water, P3=7.5 mL.L-1 water, and as a Sub Plot was a Variety (V) consist of 3 levels, they were V1=Cibogo Variety, V2=Mekongga Variety, V3=Ciherang Variety. The results showed that that the Mekongga variety is the most resistant variety to the pathogen  Xanthomonas oryzae  pv. Oryzae. The use of  P. Polymyxa  Mace as biological agents effective to control Bacterial Leaf Blight caused by the pathogen  X oryzae  pv. Oryzae on several rice plant varieties ( Oryza sativa  L.), and the best concentration of  P. Polymyxa  Mace to control Bacterial Leaf Blight disease was 5 mL.L-1 water.

Control of bacterial leaf blight disease in several varieties of rice plants (Oryza sativa L.) by using bacteria of Paenibacilus polymyxa Mace