BEHAVIOUR OF SOME OAT LINES TO THE ATTACK OF THE FUNGUS BLUMERIA GRAMINIS (D. C.) F. SP. AVENAE EM. MARCHAL.

Blumeria graminis (DC) f. sp. avenae Em. Marchal (powdery mildew) fungus is considered an important foliar pathogen for oat that can affect the yield and the quality, mainly in the years with cool and humid weather. Climate conditions in the spring of 2019 in Banat Plain (Lovrin area) were favourable for infections. The research objective was to identify the oat lines with good resistance to powdery mildew. Thus, there were monitored 15 oat lines. The research method applied was the calculation of the incidence, severity and infection degree of the fungus. The relative resistance of the oat lines was set by comparing the infection degree of the tested material with the oat line that had the highest sensitivity to the attack of the pathogen. The frequency of the plants with powdery mildew symptoms was comprised between 5% and 100%. The infection severity had values between 10% and 70%. The most resistant oat line from the experience was 2509 and the most sensitive was 2515. The resistant lines could be used to the creation of some productive oat varieties with a good resistance to the attack of powdery mildew. [ABSTRACT FROM AUTHOR]