The biological preparations efficiency research for potato alternaria blight decrease in terms of Western Foreststeppe of Ukraine

Goal. was to research biological preparations efficiency usage in alternaria blight harmfulness decrease and to develop effective cultivar protection system. Methods. Field and laboratory — vegetative researches. Tubers were treated by allowed biological preparations as Lists of pesticides: Planrise (Pseudomonas fluorescens, strain AR-33), Phytodoctor (Bacillus subtilis); MicoHelp (Trichoderma, Bacillus subtilis, Azotobacter, Enterobacter, Enterococcus) for disease developing decrease. The present preparations were used for spraying in future. The treating during the growing period favoured the plant organism resistance to stress conditions of environment. The first plant treating was conducted at the blossoming beginning before alternaria blight appearing on plant’s leaves plants. The second spraying was conducted during the first spots appearing on the plates of early potato varieties. Results. The researches results biological preparations: Planrise, Phytodoctor, MicoHelp treating potato defeated plants by alternaria blight were proposed. The biological preparations relative high efficiency was determined. Conclusions. The researched preparations technical efficiency was also depended upon the conducting testing variety. The biological preparation MicoHelp (variety Serpanok) showed the highest technical efficiency (46.2%) during the plant treating against potato alternaria blight. The preparation MicoHelp (variety Svitanok Kyivskyi) showed the highest efficiency during the potato treating in vegetation period. So the biological control protection means usage in the modern potato varieties allows to decrease negative impact of used preparations and put into production effective and ecologically — friendly means for alternaria blight limit in terms of Western Foreststeppe of Ukraine.