Influence of herbicide and herbicide with biostimulators on infection of selected potato cultivars by Rhizoctonia solani

The research was carried out in 2018–2020 at the Agricultural Experimental Farm of the University of Natural Sciences and Humanities in Siedlce. The experiment was established on medium soil, in a split-plot design in three replications. The following factors were investigated: I – two medium-early varieties of potato were Malaga and Oberon, II – five ways of using herbicide and herbicide with biostimulators: control object – mechanical care, Avatar 293 ZC (clomazone + metribuzin), Avatar 293 ZC and PlonoStart, Avatar 293 ZC and Aminoplant as well as Avatar 293 ZC and Agro-Sorb Folium. The following factors were assessed: percentage of infected tubers, average degree of sample infection and average degree of tuber poison infection. The obtained results showed that the methods of using the herbicide and the herbicide with biostimulators significantly reduced the average degree of infection of potato tubers with rhizoctonosis compared to the tubers collected from the control object.