Non-destructive evaluation of complex interactions between Heterodera schachtii and Rhizoctonia solani on sugar beet as affected by cultivar resistance [Elektronische Ressource] / von Christian Hillnhüetter

Institut für Nutzpflanzenwissenschaften und Ressourcenschutz (INRES) der Rheinischen Friedrich-Wilhelms-Universität Bonn Non-destructive evaluation of complex interactions between Heterodera schachtii and Rhizoctonia solani on sugar beet as affected by cultivar resistance Inaugural - Dissertation zur Erlangung des Grades Doktor der Agrarwissenschaften (Dr.agr.) der Hohen Landwirtschaftlichen Fakultät der Rheinischen Friedrich-Wilhelms-Universität zu Bonn vorgelegt am 15.11.2010 von Christian Hillnhütter aus Siegen, Deutschland Referent: Prof. Dr. R.A. Sikora Korreferent: PD Dr. G. Welp Tag der mündlichen Prüfung: 28.01.2011 Erscheinungsjahr: 2011 Non-destructive evaluation of complex interactions between Heterodera schachtii and Rhizoctonia solani on sugar beet as affected by cultivar resistance The beet cyst nematode Heterodera schachtii and Rhizoctonia crown and root rot caused by the fungus Rhizoctonia solani anastomosis group 2-2IIIB were investigated for the presence of synergistic interactions on sugar beet. Three levels of cultivar resistance were tested for their response to the fungus and nematode alone and in combination. A cultivar susceptible to both pathogens, one tolerant to R. solani and one resistant to H. schachtii were used. Synergistic damage was caused by the disease complex on the tolerant and the susceptible cultivars.