Rust /Phragmidium mucronatum (Pers.) Schltdl./ is among the most economically important diseases of the oil-bearing rose (Rosa damascena Мill. L.). The purpose of the study was to determine the development of rust in conventional, integrated and organic farming systems of the oil-bearing rose near the town of Strelcha during the 2015–2016 period.
In the assessment of the plantations health status, the prevalence, assault degree and disease development during the growing period were determined. The least developed rust was found in the integrated farming system (32%). In the conventionally grown roses it was 36.7% and in organic roses – 37.2%.
The yield in the conventional system was 5,300 kg/ha, in the integrated system – 6,250 kg/ha and in the biological system – from 1,000 kg/ha to 1,200 kg/ha.