Bondar T. Root rot at spring rape and biological justification for measures restricting its development in the Right-Bank Forest-steppe zone of Ukraine

Blackleg features and almost unknown and at spring rape very rarely met decease features such as ring root rot and blackening vessels namely hauling, thinning stems, drying plants, exfoliate of affected tissues of the root, sores, rotting and withering of main root increased growth of lateral side roots, longitudinal brown touches blackening top of the vessels are described in dissertation. Investigation and study results are the basis for scale evaluation of plants infestation. Root rot monitoring results relating vegetation period of 2002 2005, 2007 2008 and 2013 years of Right-Bank forest-steppe zone of Ukraine are among the materials of dissertation. Influence of beet cyst nematode on development of disease was determined. Harmfulness of root rot and Heterodera schachtii Schmidt was evaluated with correlation and regression analysis in root rot. Types of root rot pathogens was specified (Pythium ultimum var. ultimum Trow, Rhizoctonia solani J. G. Kuhn, Fusarium avenaceum (Fr.) Sacc., F. avenaceum var. herbarum (Corda) Bilaі, F. moniliforme J. Sheld, F. moniliforme var. lactis (Pir.:Rib.), F. oxysporum var. orthoceras (Appel & Wollenw.) Bilaі, F. sambucinum var. trichoteciodes (Wr.) Bilaі, F. oxysporum Schltdl., та F. sumbucinum var. minus Wollenw.), pathogenic characteristics study results are attached as well as main morphological and biological characteristic studies are attached. Relation between Fusarium Link mushroom isolates got from root rot was shown as well as far genetic relation between Pythium ultimum var. ultimum isolate and similar isolates got from rot systems of agriculture plants in other countries was shown. Agrotechnical, agronomic and chemical measures of restriction of root rot was studied.