Bacterial leaf blight (also called bacterial canker) can cause considerable damage in tomato plants. These bacteria can be transferred in seeds, young plants, fruit, water and during work on the plant. The bacteria can also survive in soil and substrate.

Recommended products:

Bacterial leaf blight in tomatoes is best treated by administering Argentum via LVM. In addition add SalicylPure to the A fertilizer feeder. 

A good alternative (yet more labour intensive) is to spray Argicin®Plus.

Laboratory tests run by Groen Agro Control show that crops cope 99% better with Clavibacter by their increased vitality and robustness. 
We are pleased to advise parties who wish to make use of this expertise in practise.