Abstract
The aim of this study was to evaluate the influence of cultivar and biostimulants on the health status of potato tubers after harvest and after 5 months of storage. The fungal pathogens isolated from potato tuber were cultured on PDA. The biostimulants limited the symptoms of dry rot in cv. Satina after harvest, in stored cv. Irga (Bio-Algeen S‑90) and cv. Blaue St. Galler (Kelpak SL). The symptoms of common scab were reduced in stored potatoes cv. Satina in the Asahi SL treatment and the symptoms of late blight in stored potatoes cv. Satina in the Kelpak SL and Trifender WP treatment and in cv. Valfi in the Bio-Algeen S‑90 and Kelpak SL treatment. Asahi SL and Kelpak SL decreased the severity of black scurf in stored potatoes cv. Irga. Biostimulants decreased the occurrence frequency of the causative agents of dry rot and black scurf after harvest. Total chlorogenic acid, which is predominant in potato tubers, was present in higher concentrations in the skin than in the flesh. Potato tubers had the highest content of 5‑caffeoylquinic acid, followed by neochlorogenic acid (3-caffeoylquinic acid) and cryptochlorogenic acid (4-caffeoylquinic acid). Higher concentrations of chlorogenic acid were found in potato cultivars with blue-purple- and red-colored flesh than in those with yellow- and cream-colored flesh, and in response to the application of the Asahi SL biostimulant and Trifender WP.
Highlights
The health status of potatoes determines tuber yields and their quality
Rhizoctonia solani sclerotia overwinter on infected potato tubers; they can survive in soil for several years and infect healthy plants (Larkin and Honeycutt 2006)
The aim of this study was to evaluate the influence of cultivar and biostimulants, important components of integrated crop protection systems, on the health status of potato tubers at harvest and after 5 months of storage and content of chlorogenic acids
Summary
The health status of potatoes determines tuber yields and their quality. Common scab is caused by a wide variety of Streptomyces species which are ubiquitous and highly virulent pathogens in potato farms (Cullen and Lees 2007). Potato cultivars are characterized by different susceptibility/resistance to common scab. In the group of around 20 identified species of the genus Streptomyces, S. scabies, S. acidiscabiei and S. turgidiscabiei are the most prevalent causative agents of common scab in potatoes (Lutomirska 2008). Dry rot caused by several species of the genera Fusarium and Gibberella is the most serious disease in stored potatoes which decreases potato yields by 6–25% or even up to 60% during long-term storage (Gachango et al 2012). Rhizoctonia solani sclerotia overwinter on infected potato tubers; they can survive in soil for several years and infect healthy plants (Larkin and Honeycutt 2006)
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