Efficiency of application of biopreparations and fungicides in potato rhizoctoniosis control. V.V. GAYNATULINA, O.I. KHASBIULLINA

Abstract

Efficiency of application of biopreparations and fungicides in potato rhizoctoniosis control. V.V. GAYNATULINA, O.I. KHASBIULLINA (Kamchatka Research Institute of Agriculture, Kamchatka Territory, Yelizovsky District, Sosnovka village).

The article presents experimental data on the influence of fungicides TMTD, Scor and biopreparations Sporobacterin and Trichocin on the degree of development, the prevalence of rhizoctoniosis (Rhizoctonia solani) during the vegetation of plants, yield, quality and safety of potatoes. Treatment methods have been identified and antirhizoctonia drugs have been studied for use in an integrated potato protection system. Over the years of the research, combination of treatment of seed material before planting with fungicide TMTD and foliar spraying with biopreparations Sporobacterin or Trichocin was economically beneficial agronomic practice, which provided reliable yield increase by 5.0 t/ha (21.9 %) and 2.2 t/ha (8.5 %) on average in comparison with control (22.8 t/ha), and economic experience (25.6 t/ha). In the same variants the degree of rhizoctoniosis development was lower by 14.0 and 15.2 %, stem disease prevalence – by 50.2 % and 53.1 %, sprouts lesions was lower by 0.8 % on average, tubers – by 3.5 % compared to controls without treatment. Preservation of tubers was 96.2 % when in control it was 87.7 %. The content of vitamin C increased by 1.92 and 1.71 mg% respectively. The tendency of starch increase in all variants of experience was noted. Biological efficacy of preparations contributing to the reduction of development and prevalence of rhizoctoniosis on the stems in comparison with control was 83.6 or 89.6 % with TMTD + Sporobacterin or Trichocin respectively. The economic efficiency from 1 ha was 131.5 and 173.3 thousand rubles.