Pathogenicity of UK isolates of Rhizoctonia solani to OSR

This study investigated the pathogenicity of UK isolates of Rhizoctonia solani anastomosis groups (AG) 2-1, 3, 4, 5 and 8 and Rhizoctonia cerealis to oilseed rape

Year of Publication2008

Oilseed rape (OSR) is a major crop in the UK with an area of more than 600,000 ha sown in 2007. There has been dramatic expansion of the area sown as the crop is now also grown for the biofuel market. Failure in crop establishment and poor and patchy stands are common in the UK and critical aspects such as damping off disease are often overlooked. Rhizoctonia solani has been reported to cause pre-emergence damping off, post-emergence seedling root rot of OSR in Canada, USA and Australia with annual yield losses exceeding 30%. To date no information about Rhizoctonia strains from UK rotational crops and their ability to cause seedling root rot in OSR is available. This study investigated the pathogenicity of UK isolates of R. solani anastomosis groups (AG) 2-1, 3, 4, 5 and 8 and Rhizoctonia cerealis to OSR. OSR seeds were inoculated with PDA broth of individual isolates of R. solani and the plants were grown under controlled conditions in growth cabinet. On day 21 plants were assessed for shoot and root disease incidence and severity (DI). On the same day root and shoot length for each seedling was recorded. There was significant variation in pathogenicity between isolates of the same AG. However, the greatest disease indices on both shoot and roots were recorded on plants inoculated with AG 2-1, AG4 and AG 8. AG 8 caused significantly higher disease on roots compared to all other isolates. One of the isolates of AG2-1 and AG 4 inhibited germination completely leading to 0% emergence. Isolates of AG 2-1 and AG 4 reduced shoot length by 84% and 97%, and root length by 77% and 98%, respectively, compared to the uninoculated control. Rhizoctonia cerealis was not pathogenic to OSR. Further studies are required to determine the distribution and importance of R. solani AG 2-1, 4 and 8 in OSR in UK

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Additional keywords/tags

diseaseoilseed raperhizoctonia solani
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