Treatment PO activity (ΔOD436nm mg-1 protein min-1) PPO activity (ΔOD490nm mg-1 protein min-1) LOX activity (μ mol conjugated diene mg-1 protein min-1 PAL activity (μ mol cinnamic acid mg-1 protein min-1) 14 days* 28 days 14 days* 28 days 14 days* 28 days 14 days* 28 days Untreated Non- inoculated ***0.38 ± 0.02 0.42 ± 0.03 0.07 ± 0.006 0.05 ± 0.007 2.35 ± 0.27 2.03 ± 0.12 2.28 ± 0.12 2.22 ± 0.06 Inoculated 1.35 ± 0.03 1.12  ± 0.06 0.31 ± 0.008 0.22 ± 0.002 7.71 ± 0.24 2.67  ± 0.14 11.04 ± 0.57 10.08 ± 0.48 Treated with SA (5 mM) Non-inoculated 0.82 ± 0.06 0.80 ± 0.04 0.15 ± 0.005 0.13  ± 0.005 4.04 ± 0.13 3.83  ± 0.16 10.98 ± 0.54 9.54 ± 0.88 Inoculated 2.05 ± 0.03 1.77 ± 0.01 0.85 ± 0.14 0.56 ± 0.003 9.45 ± 0.22 4.28 ± 0.21 18.42 ± 0.78 16.56 ± 0.50 Treated with ALE (10%) Non -inoculated 0.72 ± 0.05 0.67 ± 0.06 0.14 ± 0.011 0.12 ± 0.005 3.64 ± 0.18 3.49 ± 0.09 9.24 ± 0.77 8.28 ± 0.52 Inoculated 1.86 ± 0.03* 1.65 ± 0.11 0.67 ± 0.015 0.42 ± 0.02 8.53  ± 0.14 3.85 ± 0.30 14.70 ± 0.92 12.84 ± 1.53 CD at 5% 0.124 0.174 0.156 0.035 0.612 0.623 2.83 2.44 CD at 1% 0.174 0.259 0.223 0.048 0.858 0.873 3.97 3.42

SA: Salicylic acid; ALE: Acalypha leaf extract *after inoculation **Average of 4 replicate rhizome seeds/treatment ***3 replicates/treatment

Table 3: Effect of plant defence activators (SA and ALE) on disease development and enzyme activities in ginger leaves.