Biological efficiency of the laboratory samples of microbiopreparations based on the perspective strains-producers from species Chaetomium and Bacillus controlling downy mildew pathogen on sunflower

We tested laboratory samples of microbiopreparations basing on the strains-producers Xk-1-4 Chaetomium olivaceum and B-12 Bacillus licheniformis under artificial inoculation of sunflower seedlings by a downy mildew pathogen (56.0-90.7%) in laboratory conditions. The tests allowed determining the effective forms and application rates of microbiopreparations. The preparation forms ‘wettable powder', a titer 3.2-8.1 × 108 CFU per g, minimal application rate of a preparation - 0.05 kg per ton (biological efficiency is equal 58.3-81.9%), ‘water suspension', titer 2.2-6.8 × 108-9 CFU per ml, application rate - 6.0 liter per ton (72.1- 72.9%), ‘powder' on seeds, titer 2.8-7.5 × 108-9 CFU per g, application rate - 3.0 kg per ton (67.5-71.3%) and ‘powder on sulphite alcohol mixture', titer 3.5-7.2 × 108-9 CFU per g, application rate - 2.0 kg per ton (66.0-70.0%) were the most effective for the strain-producer Xk-1-4 Chaetomium olivaceum ...