Effect of Pre-Planting Treatment of Tubers, Soil and Vegetable Potato Plants on Resistance to Rhizoctonia

The results of studies on the effect of fungicides and the biological product НВ-101 against Rhizoctonia solani in the Kamchatka Territory are presented. An integrated system of plant protection against diseases is effective with the inclusion of biological products and the ability to simultaneously increase plant resistance to diseases and abiotic stresses, as well as activate growth processes. The research has shown that a positive result in the fight against rhizoctonia was obtained by treating the soil with fungicides Uniform or Quadris and spraying plants with the biopreparation НВ-101. The degree of rhizoctonia development was 3.1 and 2.9%, the prevalence of the disease was 13.0 and 11.5%, which is lower than the control without treatment by an average of 14.9 and 47.1%, the damage to sprouts decreased by 1.7%, tubers — 8.6%. The biological efficiency of the preparations was 81.5% versus 70.6% when treated with fungicides only. The combined effect of the fungicides Uniform or Quadris on the soil and the biopreparation НВ-101 on potato plants ensured the maximum yield increase compared to the control by 6.0 and 5.9 t/ga (25.4 and 25.0%), the number of commercial tubers increased by 3.5 and 3.9%, the weight of commercial tuber — by 11.5 and 7.1 g, seed — by 5.6 and 3.1%, vitamin C — 0.63 and 5.20 mg%. When using the fungicides Uniform and Quadris, the preparation НВ-101, the maximum preservation of tubers was 96.5 and 96.3%, which is higher than the control by 13.8 and 13.6%. The biological efficiency during storage averaged 83.4%. The economic efficiency of using fungicides Uniform or Quadris and biological product НВ-101 averaged 230.5 thousand rubles per hectare.