Natural Agents Limiting Diseases on Potato Tuber Peel

S. MAZUR, H. KURZAWIŃSKA, J. NAWROCKI and M. NADZIAKIEWICZ
University of Agriculture, Department of Plant Protection, Faculty of Horticulture, 31-425 Krakow, Poland

Abstract

MAZUR, S., H. KURZAWIŃSKA, J. NAWROCKI and M. NADZIAKIEWICZ, 2016. Natural agents limiting diseases on potato tuber peel. Bulg. J. Agric. Sci., 22: 458–464

During a three-year fi eld experiment (2009 – 2011), we investigated the infl uence of preparations based on natural substances used during the potato vegetation period on the infection of tubers by the following pathogens causing peel diseases: Helminthosporium solani, Rhizoctonia solani and Streptomyces spp. The following treatments or combinations were included chitosan, grapefruit extract, orange oil, dimethomorph + mancozeb, control. After harvesting, 100 tubers were randomly picked from each fi eld and put in storage. The infestation rate and percentage of tubers with sclerotia from R. solani and infections by Streptomyces spp. were estimated directly after harvesting. An analysis of the rate of infestation and percentage of tubers infected with H. solani was carried out after a three-month storage period. Based on the obtained results, we found that preparations used during the potato vegetation period lowered the incidence and degree of tuber infection with H. solani, R. solani and Streptomyces spp.

Key words: biological agents, protection, Rhizoctonia solani, Helminthosporium solani, Streptomyces spp.

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