IC50, median inhibitory concentration; A. tum., Agrobacterium tumefaciens; B. sub., Bacillus subtilis; P. lach., Pseudomonas lachrymans; R. sol., Ralstonia solanacearum; M. or., Magnaporthe oryzae. Positive controls (CK+) for bacteria and fungus (M. oryzae) were streptomycin sulfate and carbendazim, respectively. nd, not detected. Other compounds did not show obvious inhibitory activity at 250 μg mL–1. nd, no data.