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Interactions between population densities of the nematode Globodera pallida and

This study explores interactions between G. pallida and R. solani by comparing disease development in potato plants inoculated with a range of G. pallida juvenile densities with R. solani

Year of Publication2008

The potato cyst nematode Globodera pallida and the soil borne fungus Rhizoctonia solani AG3 are problematic and widespread on potatoes in the UK, limiting efficient potato production. Previously the combined presence of G. pallida and R. solani has been shown to cause a damaging disease complex of potato but until now no study has investigated the effect of nematode densities on R. solani disease of potato. This study explores interactions between G. pallida and R. solani by comparing disease development in potato plants inoculated with a range of G. pallida juvenile densities with R. solani. The treatments included inoculating a range of G. pallida juvenile densities with R. solani, and organism alone at 2, 4 and 6 weeks after planting in the controlled environment conditions. A sequence of potato plants samples were taken to assess any effects of nematode infestation on the incident of R. solani disease severity. The results showed that the severity of stolon infection and stolon pruning caused by R. solani significantly increased with a high density of G. pallida juveniles. A regression analysis revealed a positive relationship between the number of nematodes juveniles present in the roots and incidence of stolon infection, stolon pruning and stem canker by R. solani. The various R. solani disease severities were more likely to be greater when potato plants are infested by G. pallida at an early stage of their development. For the first time an interaction between G. pallida and R. solani disease has been demonstrated.

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potato diseasesnematodes
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Supporting the development of the national rural economy.

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