NATURAL AGENTS LIMITING DISEASES ON POTATO TUBER PEEL

J. Nawrocki, S. Mazur, M. Nadziakiewicz, H. Kurzawińska

Abstract: During a three-year field experiment (2009 – 2011), we investigated the influence 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 field 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.

Keywords: biological agents; Helminthosporium solani; protection; Rhizoctonia solani; Streptomyces spp.

Date published: 2017-08-30