Combined fungicide for the protection of oilseeds

Abstract

Sunflower is a strategically important crop in ensuring food security. To obtain high yields, timely diagnosis of diseases and the right choice of highly effective drugs for its protection are necessary. Sunflower is affected by phytopathogens such as gray rot (Botryotinia fuckeliana (de Bary) Whet. [Botrytis cinerea Pers.] (Botrci) and white rot (Sclerotinia sclerotiorum (Lib.) de Bary (Sclesc). Gray rot leads to a 60–80% loss of yield, white rot leads to a decrease in fat in the seeds and a bitter taste of the oil. An unregistered new multicomponent fungicide, “Elgafar, CE” (300 g/l propiconazole + 200 g/L tebuconazole), and a sunflower-based fungicide, “Amistar Gold, SC” (125 g/l azoxystrobine + 125 g/L diphenoconazole), were selected for research. The research was carried out on sunflower of the VNIIMK 8883 improved variety from the V.S. Pustovoit Federal Research Center VNIIMK. As a result of the research, it was found that treatment with a norm of 0.6 l/ha leads to a decrease in the development of gray rot (Botrytis cinerea) to 4.5–4.9% and the effectiveness of the drug 83.5%. The tested drug also showed high efficacy against white rot (Sclerotinia sclerotiorum) at application rates of 0.4–0.6 l/ha, corresponding to 82.9–84.2%. The results obtained confirm the expediency of spraying with the fungicide “Elgafar, CE” (300 g/l propiconazole + 200 g/l tebuconazole) in the tested application rates in order to increase the yield and quality of sunflower seeds.