Rhizoctonia solani in sugar beet (Volume 51)

Relations between soil physical properties and disease severity as well as quantification of the Rhizoctonia inoculum potential in soils

Sascha Schulze (Author)

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ISBN-13 (Hard Copy)	9783736995925
ISBN-13 (eBook)	9783736985926
Language	English
Page Number	148
Lamination of Cover	matt
Edition	1.
Book Series	Aus dem Institut für Zuckerrübenforschung Göttingen
Volume	51
Publication Place	Göttingen
Place of Dissertation	Göttingen
Publication Date	2017-07-31
General Categorization	Dissertation
Departments	Agricultural science
Keywords	Rhizoctonia solani, AG2-2IIIB, soil structure, penetration resistance, agronomy, phytopathology, soil tillage, pathogen, soil inoculum potential, sugar beet, crown and root rot

Description

For sugar beet, Rhizoctonia solani AG2-2IIIB is the causal agent of the Rhizoctonia crown and root rot. It is assumed, but not clear to which extend, that the soil structure, more specifically individual soil physical properties, affect the R. solani inoculum potential in the soil and the disease severity in sugar beet. This study aimed to identify individual soil physical properties with a significant impact on disease severity of a susceptible and a resistant sugar beet variety. The environment was the most important factor affecting disease severity and white sugar yield of both sugar beet varieties. Penetration resistance, as a soil physical parameter, was identified to have major impact on the disease. Both sugar beet varieties showed the same reaction in disease severity and white sugar yield to increasing penetration resistance at low-disease levels. However, at higher disease levels, the susceptible variety showed a higher decrease. Moreover, a new reliable real-time PCR based method was developed to determine the inoculum potential of R. solani AG2-2IIIB in soils. The method was applied to study the effect of a susceptible and a resistant sugar beet variety and subsequently grown winter rye as a nonhost crop on the R. solani inoculum potential in field soils. It could be concluded that there is an increasing risk of an elevated disease level when a susceptible sugar beet variety is grown.