Table 4 Herbicidal activity of different solvent extracts of C. Spicata against C. intybus (GPI germination percent Inhibition, RLI root length Inhibition, SLI shoot length Inhibition, CSREA   C. Spicata rhizome extract in acetone; CSREH  C. Spicata rhizome extract in hexane, CSREM   C. Spicata rhizome extract in methanol, CSAEA  C. Spicata aerial part extract in acetone, CSAEH  C. Spicata aerial part extract in hexane, CSAEM  C. Spicata aerial part extract in methanol, SD standard deviation, the Tukey’s test (p < 0.05) indicates that there is no statistically significant difference between mean values in a column that is followed by the same letter.)

CSREA

250

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

500

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

1000

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

CSREH

250

20.00 ± 0.71^a

77.89 ± 0.15^b

86.00 ± 0.08^b

500

28.00 ± 0.84^b

73.16 ± 0.08^a

76.00 ± 0.11^a

1000

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

CSREM

250

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

500

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

1000

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

CSAEA

250

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

500

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

1000

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

CSAEH

250

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

500

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

1000

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

CSAEM

250

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

500

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

1000

100.00 ± 0.00^c

100.00 ± 0.00^c

100.00 ± 0.00^c

Pendimethalin

100.00 ± 0.00

100.00 ± 0.00

100.00 ± 0.00