Fig. 3From: Evaluation of biological efficacy of Trichoderma asperellum against tomato bacterial wilt caused by Ralstonia solanacearumChanges in polyphenol oxidase (PPO) activity in tomato plants of different treatments. Mean values were three replicates. Bars represent standard error. Plants inoculated with R. solanacearum alone (RS); plants inoculated with T. asperellum alone (T4 and T8); T. asperellum-treated tomato plants challenged with R. solanacearum (RS + T4 and RS + T8)Back to article page