Penthiopyrad applied in close proximity to Rhizoctonia solani provided effective disease control in sugar beet |
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| Institution: | 1. Department of Plant Pathology, North Dakota State University, Dept. 7660, PO Box 6050, Fargo, ND 58108-6050, USA;2. University of Minnesota, St Paul, MN, USA;1. Institute of Forensic Medicine, Faculty of Medicine, University of Ni?, Ni?, Serbia;2. Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, Serbia;3. Department of Biochemistry, Faculty of Medicine, University of Ni?, Ni?, Serbia;4. Department of Chemistry, Faculty of Medicine, University of Ni?, Ni?, Serbia;1. Institute for Genome Research and Systems Biology, CeBiTec, Bielefeld University, D-33501 Bielefeld, Germany;2. Syngenta Seeds AB, Säbyholmsvägen 24, 26191 Landskrona, Sweden;3. Swedish University of Agricultural Sciences, Department of Plant Biology, Uppsala BioCenter, Linnean Center for Plant Biology, P.O. Box 7080, S-75007 Uppsala, Sweden;4. Bioinformatics and Systems Biology, Gießen University, D-35392 Gießen, Germany;5. Institute for Sugar Beet Research, Department of Phytopathology, D-37079 Göttingen, Germany;1. State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products/Key Laboratory of Detection for Pesticide Residues and Control of Zhejiang, Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, PR China;2. Agricultural Ministry Key Laboratory for Pesticide Residue Detection, Hangzhou 310021, PR China;3. Hangzhou Jajale Biotech Co. Ltd, Hangzhou 310018, PR China |
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| Abstract: | Rhizoctonia solani Kühn is an important pathogen of sugar beet (Beta vulgaris L.) that can cause damping-off and crown and root rot. Commercial cultivars which are highly resistant to the pathogen are not as high yielding as susceptible cultivars under low or absent disease pressure. These resistant cultivars often do not have resistance to other common pathogens such as Aphanomyces cochlioides, Cercospora beticola, and Fusarium oxysporum. Fungicides, such as azoxystrobin which belongs to the quinone outside inhibitors (QoI) class, are necessary for controlling Rhizoctonia solani, but there are concerns about the buildup of fungicide-resistant strains in the targeted pathogen population. There is a need to find effective fungicides from different chemical groups so they can be rotated with the current widely-used azoxystrobin to manage R. solani. The objective of this greenhouse study was to evaluate the efficacy of penthiopyrad, a succinate dehydrogenase inhibitor (SDHI), in managing R. solani on sugar beet using three different application methodologies. Penthiopyrad effectively controlled R. solani on sugar beet when applied at 210, 280, 420, or 550 g a.i./ha in-furrow at planting and as a soil drench at the 4-leaf stage. However, foliar application of penthiopyrad failed to provide disease control. These trials indicated that penthiopyrad needs to be in close proximity or direct contact with R. solani in the soil to provide effective control. Penthiopyrad has the potential to be used as an effective alternate partner with azoxystrobin for controlling R. solani and to help in mitigating the development of fungicide resistant isolates of R. solani. |
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| Keywords: | Quadris Vertisan Azoxystrobin Fungicides Sugar beet |
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