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The aim of two year field investigations was to evaluate the effect of seed-potato dressing and plants spraying treatments with biotechnical preparations (Biosept 33 SL – a.s. extract of grapefruit, Biochikol 020 PC – a.s. chitosan) on infection of potato tubers by Rhizoctonia solani and Helminthosporium solani. As a standard fungicide Vitavax 2000 FS (a.s. karboxin and thiuram) was used. During the...
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