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Bacterial soft rot of carrot (Pectobacterium aroidearum) – identify and control
Bacterial soft rot of carrot, Pectobacterium aroidearum, was first signaled in 1991 in America, and it is now spread to all crops. It causes damage both in the field and in warehouses.
Symptoms. During years with colder summers and abundant rains, the affected roots have wet-looking like spots, that are yellow-brown and located at the soil level. The spots can unite and then a large surface of the roots will have sunken tissues, filled with mucus and brown.
The bacterial soft rot of carrot pathogen will survive the winter on the rotten roots that are located in the soil. The bacteria will penetrate the plants through wounds that have been caused by insects or by maintenance procedures. The bacteria will make their way into the plant using the intercellular spaces and then will liquefy the cell walls, which leads to the formation of sunken tissues. The range of host plants for this bacteria is very wide, as all root vegetables are affected.
Prevention and control. When choosing the land for the leguminous vegetables, the range of host plants for the bacteria must be taken into account. Clay soils should be avoided. Phosphorus fertilizers and limestone adding will increase the plant’s resistance to this bacteria. Before storage, make sure to thoroughly sort the material and to have the storing space well disinfected. During the vegetation, treatments with copper fungicides are made.
