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Efficacy and safety of mixing azoxystrobin and starter fertilizers for controlling Rhizoctonia solani in sugar beet

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Abstract

Rhizoctonia damping-off and crown and root rot of sugar beet caused by Rhizoctonia solani are serious problems in Minnesota and North Dakota. Timely application of azoxystrobin fungicide effectively controls R. solani. Many growers use starter fertilizers at planting as an economic way to apply phosphate and will like to know if mixing azoxystrobin with starter fertilizers is safe and effective. The objective of this research was to determine the efficacy and safety of mixing azoxystrobin with starter fertilizers for controlling R. solani of sugar beet. Research was conducted in a greenhouse maintained at 20 ± 2° C. Three different starter fertilizers 10-34-0, 6-24-6 and Redline were each used at 28.05 L ha-1 and azoxystrobin was used at 167 g a.i. ha-1. Treatments were applied to ten sugar beet seeds planted in a furrow of Sunshine Mix 1 peat filled tray. There were 13 treatments including a non-inoculated and an inoculated control; starter fertilizers used without and with inoculation; azoxystrobin used alone without and with inoculation; and azoxystrobin mixed with each of the different starter fertilizers followed by inoculation. Plants were watered daily and evaluated 28 days after treatments. The non-inoculated control and treatments where only starter fertilizers were used resulted in significantly higher percentages of healthy surviving plants compared to the inoculated control. Azoxystrobin provided similar effective control of R. solani when used alone compared to when it was mixed with starter fertilizers and there was no phytotoxicity. This study suggests that mixtures of azoxystrobin with different starter fertilizers evaluated under greenhouse conditions resulted in no phytotoxicity observed in this study and effectively controlled R. solani.

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Acknowledgments

Our thanks are expressed to the Sugarbeet Research and Education Board of Minnesota and North Dakota for partial funding of this project.

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Authors and Affiliations

  1. Department of Plant Pathology, North Dakota State University, Fargo, ND, 58108, USA

    A. Noor & M. F. R. Khan

  2. University of Minnesota, St Paul, MN, USA

    M. F. R. Khan

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  1. A. Noor
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  2. M. F. R. Khan
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Correspondence to M. F. R. Khan.

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Noor, A., Khan, M.F.R. Efficacy and safety of mixing azoxystrobin and starter fertilizers for controlling Rhizoctonia solani in sugar beet. Phytoparasitica 43, 51–55 (2015). https://doi.org/10.1007/s12600-014-0416-3

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  • DOI: https://doi.org/10.1007/s12600-014-0416-3

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