Havryliuk A. Potato Alternaria Blight and Biological Bases for Decreasing its Development in Southern-Western Ukrainian Foreststeppe.

Dissertation work dedicates to potato alternaria blight it’s developing and improving integrated system of the present cultivar protection from diseases in conditions of south ‒ western Foreststeppe of Ukraine. It is determined that in terms of south ‒ western Foreststeppe of Ukraine of potato alternaria blight causative agent are fungi Alternaria: Alternaria solani (Ell.et Mart.) and Alternaria alternatа (Keissler). The pathogen’s wintering and spring recovery peculiarities were determined. The outside environment influence (temperature mode, humidity) on disease development was determined. The optimal temperature for germination of conidia in vibration range 24‒26 ºC was determined. The varieties resistance to alternaria blight was determined. It is necessary to use them in producing resistant and relatively resistant to disease varieties for growing technology. The agrotechnical, chemical and biological means efficiency on potato alternaria blight developing was determined. The fungicide’s technical efficiency against potato alternaria blight was determined. The phytosanitary monitoring of south ‒ western Foreststeppe of Ukraine was conducted at first. The abovementioned disease’s level and spread determined. The ways for determining potato resistance to alternaria blight by peroxidase analysis, conductometry method, the way of infra-red spectroscopy. The evaluation for suitability was conducted by specified methods and the useful patented models: «The way for determining potato resistance to alternaria blight causative agent Alternaria (Nees)», «The way for determining potato resistance to alternaria blight Alternatia (Nees) by peroxidase analysis», «Way for determining potato resistance to Alternaria solani (Ell et Mart), Alternaria alternate (Keissler)». The received results are a methodological base for protection from potato Alternaria blight spread and developing in South-Westerb Foreststeppe of Ukraine.