Integrated control of rhizoctonia root rot. First results of an International institute for beet research trial series
2001
Ayala, G. | Buettner, G. | Guitierrez, H. | Heijbroek, W. | Ioannides, P. | Nihlgaard, M. | Molard, R. | Panella, L. | Rossi, V. | Roesner, H. | Schneider, J.H.M. | Wauters, A.
The Rhizoctonia root and crown rot (Rhizoctonia solani Kuehn) has spread significantly in the past years in many sugar beet growing areas worldwide causing substantial losses in the sugar beet crop. Since 1999, the IIRB study group "Pests and Diseases" coordinates a multinational research project which aims to characterize the disease under the cultivation conditions of the participating countries and to develop strategies to control the disease. Initial results from the current trials are presented here. On the majority of trial sites with natural Rhizoctonia infestation, Rhizoctonia solani of the anastomosis group AG 2-2 3B could be identified. 21 performance studies in 1999, and 23 such studies in 2000 could be analysed, in which conventional sugar beet varieties and rhizoctonia resistant varieties were compared with respect to the disease progression and/or extent of damage caused by the beet rot. Under infested conditions the resistant varieties were more or less superior as compared to conventional varieties - under non infested conditions, however, they showed a white sugar yield (WSY) reduced by 10 to 15 /. Supplementing the sugar beet seeds with a Rhizoctonia specific fungicide did not result in a reduction of damage. Due to the non predictable, often partly occurrence of the disease in the field, artificial inoculation of sugar beets with Rhizoctonia solani will be used for the trials of 2001 more frequently than in the years before. The necessary techniques were developed at various sugar beet research institutes.
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