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Rice ear bug is one of the factors causing rice growth failure. This research aims to increase the rice ear bug’s mortality number using extract liquid from a biological agent Beuveria bassiana at various concentration levels. Beauveria bassiana liquid sprayed on rice ear bugs in a net type hood on rice plant clumps. The dosage of beuveria bassiana extracts mixed into the water at ratios in 2 ml/L, 5 ml/L, 8 ml/L, and 10 ml/L. The result shows that the best-used dosage in controlling the bug is 10 ml of Beuveria bassiana extract liquid in 1 liter of water. It is shown from the percentage of rice ear bug’s mortality, which is the highest (76.92%) for 12 days of observation. Meanwhile, using a dosage of 10 mL/L shows the physical change of the bug’s dead body. The fungus appears on the whole bug’s dead body. The fungus spreads from day 8 of observation while the dosages of 8 mL/L and 10 mL/L are used. Moreover, the lowest mortality percentage is 28.57%, while 2 mL/L dosages are used for 12 days.