The studies were conducted at the Agricultural Experimental Farm of the University of Natural Sciences and Humanites in Siedlce, in 2004–2006. The aim of the studies was to determine the influence selected insecticides (Actara 25 WG – 0.08 kg/ha, Regent 200 SC – 0.1 l/ha, Calypso 480 SC – three doses: 0.05; 0.075; 0,1 l/ha), used for the control of potato beetle, on the content of polyphenols in potato tubers of three potato cultivars (Wiking, Mors, Żagiel). The insecticides significantly increased the content of polyphenols as compared with the tubers harvested from the control variant without no chemical protection applied. The highest content of polyphenols was found in the tubers of the cultivar Mors, significantly less in Żagiel, and the least in Wiking.
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