Search of optimal method of artificial inoculation of sunflower with downy mildew pathogen with purpose to determine efficiency of test samples of microbiopreparations

The optimal methods of artificial inoculation with pathogen in laboratory conditions were searched for development of a microbiological method of sunflower protection againts Downy Mildew. As a result of researches of artificial inoculations with downy mildew pathogen there were modified two methods. In first case, seedlings with optimal root length were inoculated in germinators with filter-paper. In second one, the seedlings with husks and seed-coat were inoculated in phase of hypocotyl in germinators with sand. The husk with seed-coat left on seeds for inoculation allowed keeping the testing preparations on seedlings for a long time and protecting it on a high level at heavy infection. The strain of antagonist Xk-1 Chaetomium olivaceum was assigned from collection of the laboratory of biological methods as perspective for downy mildew control in sunflower sowings.