Equipment and workers should begin work in the cleanest field and finish with the contaminated field.Ĭopper sprays every five to seven days may help reduce the spread of bacterial canker. Any equipment used in the problem field should be washed and disinfected prior to entering a clean field. At one time it was believed that a rotation of at least five years was necessary, however, it is now known that the level of bacteria in a contaminated field drops dramatically after the first year of rotation. Bacteria that overwinter on a wooden surface may be carried to the plants in water droplets next season during the splashing of overhead irrigation.Ī contaminated field should be rotated out of tomatoes for at least three years. A simple washing of wooden surfaces is inadequate because of the cracks and crevices that may allow the bacteria to escape a surface wash. Wooden structures, such as benches or trays should be soaked in a disinfestant such as bleach (10 percent) or GreenShield for a minimum of an hour and preferably overnight. with a 10 percent solution of bleach or a commercial disinfestant (GreenShield is an example). If a greenhouse is contaminated, remove all plant material from the greenhouse (including weeds and dead plant tissue on the floor), wash and disinfect floor surfaces, hoses, equipment, etc. Once a greenhouse or field is contaminated with bacterial canker, steps must be taken to assure that future crops remain disease free. Bacterial canker can be introduced into a clean field via transplants, machinery and wooden stakes or other equipment that has been previously used in an infested field. Young plants are more susceptible than older plants. Although yield losses vary among years, bacterial canker has the potential to be devastating. michiganensis ( Cmm), and causes plant stunting, wilting and fruit spotting. Bacterial canker is caused by the bacterium, Clavibacter michiganensis subsp. Bacterial cankerīacterial canker is diagnosed yearly in Michigan tomato fields. Check the label of any pesticide referenced to ensure your use is included. Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts.
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