FIG. 2.

Effect of sodium salicylate (SA) and ammonium sulfate amendment on effectiveness of P. syringae Cit7 and Cit7(pNAH7) in reduction of foliar severity of bacterial speck of tomato under greenhouse conditions. Sodium salicylate and ammonium sulfate were applied at concentrations of 0.3 and 0.6 g/liter, respectively. Control plants were treated with buffer or nutritional amendments but no biological control agent. Reduction in disease severity was derived from the mean of four repeated experiments. Same letter indicates no significant difference (P = 0.05).