Biological treatments to control bacterial canker of greenhouse tomatoes

Experiments were conducted to determine the effects of treatments on Clavibacter michiganensis subsp. michiganensis in vitro and on young seedlingsinoculated with the pathogen under greenhouseconditions. Lysozyme was bactericidal at 10 g/l concentration in vitro. Tomato plantstreated with lysozyme at 10 g/l and 100 g/lshowed significantly higher plant heightcompared with the inoculated control plants,and plants in these treatments were as tall asthose observed in untreated uninoculatedcontrol plants. Treatments with B. subtilis (Quadra 136) and Trichoderma harzianum (RootShield®), lysozyme,vermicompostea, Rhodosporidium diobovatum(S33), B. subtilis (Quadra 137) appliedas a spray at 0.3 g/l, 0.6 g/l, 10 g/l,concentrated, 1 × 109 CFU/ml, and 0.5 g/l,respectively, have the ability to prevent theincidence of bacterial canker of tomato plantscaused by C. michiganensis subsp.michiganensis under greenhouse conditions.