Infestation of potato tubers by a Streptomyces scabies depending on application of herbicides and biostimulants

In the years 2012–2014 field experiment was conducted in the town of Wojnów in the Masovian Voivodeship. The aim of the study was to determine the occurrence of common scab on edible potato tubers depending on the herbicides and herbicides with biostimulators. In the experiment, two factors were examined: the first order factor were potato varieties: Bartek, Gawin, Honorata, while the second order factor was five ways of using herbicides and herbicides with biostimulators: control object – mechanical care, Harrier 295 ZC, Harrier 295 ZC and Kelpak SL, Sencor 70 WG and Sencor 70 WG and Asahi SL. The assessment of tuber infestation with scab was made using a 9-point scale on 100 randomly selected tubers from individual objects of the experiment. Herbicides and herbicides with biostimulators used in potato cultivation significantly reduced the occurrence of common scab on tubers and reduced the average degree of sample infestation and infected tubers.