Bilovus G. The barley blotch and measures to their control in the conditions of western Forest-Steppe of Ukraine

It is proved that the blotchy nature of spring barley leaves in conditions of western Forest-Steppe of Ukraine is caused by the stimuli Drechslera teres Ito, Drechslera graminea Ito, Bipolaris sorokiniana Shoem. During the years of investigation the average development of spot blotches was within the limits of 28,8-45,6 %, net blotch - 35,6-43,8 %, leaf stripe - 36,1-47,0 %. The specific structure of spot blotch, leaf stripe and net blotch stimuli was investigated, their harmfulness and the influence of abiotic factors on their development. It was also studied the influence of grades stability, predecessors, seeding norms, sowing terms, fertilizers in blotch development restriction. High efficiency of seed disinfectans usage is established, i.e. Vitavaks 200FF, 34% (3 l/t) - 72,8-75,8 %; Lospel, 12,5 % (0,9-1,2 l/t) - 51,4-72,1 %; Raksyl, 6% (0,4 l/t) - 61,2-70,2 % and fungicides: Тilt, 250 EC (0,5 l/h) - 74,0-76,8 %; Reks Т (0,75 l/h) - 71,8-75,2 %; Alto Super 330 EC (0,5 l/h) - 78,0-81,1 %. The research results are inculcated in a joint society with limited liability "Pidgajchyky", Lviv region, on the area of 100 hectares. The economical effect of chemical means of plant protection is 353,7-370,0 hrv/hec. The sphere of usage is an agricultural production.