Pathogenicity severity of Iranian isolates of Rhizoctonia solani in Burren potato cultivar

Rhizoctonia solani Kühn is a soil borne fungus that causes stem canker and black scurf and severely damages crop in various potato growing areas in Iran. The aim of this study was to investigate the pathogenicity of various fungal isolates from different potato growing areas in Iran on the Burren cultivar.

In this study, The pathogenicity of 70 isolates of Rhizoctonia solani from major potato growing areas in Iran including the provinces of Ardabil, Isfahan, Fars, Kurdistan, Kerman, Lorestan and Hamedan was investigated on the potato cultivar ‘Burren’ in completely randomized design experiment under greenhouse conditions.

The analysis of variance showed that the pathogenicity of the isolates was very different at probability level of 1% is significant, and therefore they were divided into different groups.

The isolates of Ardabil-1, Ardabil-5, Isfahan-14, Fars-26, Fars-29, Kurdistan-34, Kurdistan-39, Kurdistan-40, Kerman-47 and Hamedan-66 had the highest pathogenicity, while the  isolates Fars-21, Isfahan-20, Hamedan-65 and Isfahan-18 showed the lowest pathogenicity, respectively.