Maslikova K. The biologic-ecological features of the causal organism of late blight (Phytophthora infestans (Mont.) de Bary) on tomatoes grown in the northern steppe zone of Ukraine.

Object of investigation - The isolates of causal organism of late blight (Phytophthora infestans (Mont.) de Bary), bacteria-antagonists, sorts and hybrids of tomato.Subject of investigation - the biological and ecological features of the causal organism of tomato late blight, factors influencing on development of disease, pathogenic properties of Ph. infestans and its relationship with the representatives of bacteria.Methods used in research - mycological, phytopathological.Scientific novelty - The analysis of Ph. infestans population resulting from the determination of the neutral markers complex has been done for the first time in Ukraine. In recent years in the northern steppe of the country certain changes in Ph. infestans population structure towards the reinforcement of pathogen aggressive properties have been observed. The fatty acid composition of Ph. infestans mycelium has been explored. For the first time it has been proved that the method of profiling methyl ethers of fatty acids can be usedas a neutral marker in Ph. infestans population studies. The dependence of Ph. infestans pathogen properties upon the race, the type of compatibility and the variety of a host-plant has been determined. The morphological diversity of the pathogen vegetative structures as well as the influence of growing conditions on its morphological and cultural features have been proved. The distinct antagonistic activity of bacteria Burkholderia (strain BA-7) and Bacillus (strain BA-142 and BA-58) towards Ph. infestans has been detected; the possibility of their usage for the biological control of late blight has been proved.Results of researches is used in an educational process and research work. Field of studying -agriculture.