Interactions Between the Potato Cyst Nematode Globodera rostochiensis and Diseases Caused by Rhizoctonia solani AG3 in Potatoes Under Field Conditions |
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| Authors: | Matthew Back Patrick Haydock Peter Jenkinson |
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| Institution: | (1) Crop and Environment Research Centre, Harper Adams University College, TF10 8NB Newport, Shropshire, UK;(2) Environmental Science, Westlakes Scientific Consulting, Westlakes Science and Technology Park, Princess Royal Building, CA24 3LN Moor Row, Cumbria, UK |
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| Abstract: | Findings from 2 years of field experiments investigating the relationship between Globodera rostochiensis and Rhizoctonia solani on unique field sites are reported. In 2000, a field experiment was positioned on land that had previously been used for
experimental work investigating integrated potato cyst nematode (PCN) management methods. This study had produced an ‘untypical’
mosaic of PCN population densities ranging from 5 to 221 eggs g−1 soil. In 2001, the field experiment was conducted on a different field site and overlaid on a focus of G. rostochiensis population densities ranging from 11 to 108 eggs g−1 soil. In each experiment, potatoes (cv. Désirée) were grown in plots with similar population densities of G. rostochiensis that were either uninoculated or inoculated with R. solani. A series of potato plant harvests were undertaken to investigate the effects of nematode infestation on the incidence and
severity of R. solani diseases and the associated development of plants. In both experiments, a clear relationship was found between the density
of G. rostochiensis juveniles present in potato roots and the incidence of stolons infected by R. solani, 6 weeks after planting. For the first time this interaction has been determined under field conditions. The results of the
study suggest that the interaction between nematode and fungus is indirect and possible mechanisms are discussed. |
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| Keywords: | disease complex Globodera rostochiensis Rhizoctonia solani Solanum tuberosum stem canker synergistic interaction |
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