Inhibitor effect (mm)

Concentrations of essential oil (μg/mL)

20

10

5

2.5

1.25

0.75

C(+)

C(−)

R1

26

16

12

10

0

0

22

0

R2

27

14

12

8

0

0

20

0

R3

27

16

10

8

0

0

21

0

R4

24

14

10

9

0

0

20

0

R5

25

14

10

8

0

0

21

0

R6

25

14

11

9

0

0

21

0

$\overline{x}$ ± s

25.7 ± 1.21

14.7 ± 1.03

10.8 ± 0.98

8.7 ± 0.82

0

0

20.8 ± 0.75

0

%

123

70.1

51.9

41.3

0

0

-

-