Effects of Host Resistance Inducers and Copper Based Bactericides On Plant Growth and Bacterial Canker (Clavibacter michiganensis subsp. michiganensis) On Tomato Seedlings

Clavibacter michiganensis subsp. michiganensis is the causative agent of bacterial canker of tomato (Lycopersicon esculentum). Seed borne pathogen caused wilting of tomato, browning of vascular tissue and formation bird eye spots on fruit. In the study, the effectiveness of plant growth regulator (Prohexadione-Ca (PC)), plant activator (hydrogen peroxide (HP)) and copper compounds (copper sulfate pentahydrate (CSP) and copper hydroxide) were determined on plant growth and growth of bacterial population on three tomato cultivars ‘Newton’, ‘Orient’ and ‘Vuslat’. The best chemical was HP on preventing of bacterial growth (39.26-48.61%). Only PC treatments have decreased plant heights (38-46%) and bacterial population (about 12%). CSP applications caused the most effective results on increasing of plant heights (11-19%) however bacterial population increased between 4.15-7.69% in all of the cultivars. If integrated properly in plant health management programs, plant activators and growth regulators can be useful on plant health and growth.