Table 1.

Minimum inhibitory concentrations (MICs) of 4-hydroxybenzoic acid and vanillic acid against various plant pathogens

Plant pathogenic microorganism	MICsa (mM) of phenolic acids
	4-Hydroxybenzoic acid	Vanillic acid
Pseudomonas syringae pv. tomato DC3000	10	10
Erwinia carotovora subsp. carotovora ATCC39048	10	10
Erwinia carotovora subsp. atroseptica BAA672	10	5
Xanthomonas campestris pv. vesicatoria Ds1	10	10
Fusarium oxysporum f. sp. lycopersici	>10b	10
Colletotrichum orbiculare	>10	10

^aThe lowest concentration was determined after incubation for 48 h at which the growth of plant pathogens was inhibited.

^b>10 indicates that the growth of the microorganism was not inhibited up to the concentration of 10 mM.