Protection plants of cucumber (Cucumis sativus) based on the biological characteristics of the development of bacteriosis

Relevance. Large differences in the climatic conditions by the region Altai by years determine the prevalence and harmfulness of diseases, therefore, monitoring by the dynamics of disease development and assessing their harmfulness are relevant and necessary measures. An important role in modern plant protection technologies against diseases play biofungicides. The main advantages of biofungicides as compared with chemical plant protection products are safety for humans and the environment, short waiting times and the possibility of use throughout the growing season, the absence by risks of the emergence of resistant pathogens, the creation of conditions for the natural self–regulation of agrocenoses.Materials and Methods. The research was carried out in 2018-2020 on the fields of the West Siberian Vegetable Experimental Station of the branch of the West-Siberian vegetable experimental station – branch of the Federal State Budgetary Scientific Institution «Federal Scientific Vegetable Center». In the experiment was used the F1 hybrid Nezhinsky of Siberia. Accounting of the phytosanitary condition of crops were carried out in three periods with the determination by the degree of spread and the degree of development of the disease. Studied were the doses and timing of the use of biological preparations Phytolavin and Phytoplasmin in the fight against cucumber bacteriosis during the growing season. The repeatability of the experience was 4-fold, the placement of plots in 4 tiers, the area of the plot was 10 m2 , the accounting area was 3 m2 . The total area were 0.05 hectares.Results. The applicationof drugs Phytolavin (2 l/ha), Phytoplasmin (3 l/ha), promotes to reduce the pace of development of development of bacterial spotting of cucumber in the open ground. The least development of the disease was noted by using the drugs Phytolavin 2 l/ha, Phytoplasmin 3 l/ha, Phytolavin 2 l/ha, with alternation and an interval of 14 days. By the influence of bactericidal treatments against bacterial spotting of cucumber, a higher weight of seed fruits was obtained in all variants compared to the control. The best result – 11.96% to the control was obtained on the variant by using the preparations Phytolavin 2 l/ha, Phytoplasmin 3 l/ha with alternation.