@ARTICLE{Tratwal_Anna_Blumeria_2014,
 author={Tratwal, Anna and Bocianowski, Jan},
 volume={vol. 54},
 number={No 1},
 journal={Journal of Plant Protection Research},
 howpublished={online},
 year={2014},
 publisher={Committee of Plant Protection PAS},
 publisher={Institute of Plant Protection – National Research Institute},
 title={Blumeria graminis f. sp. hordei virulence frequency and the powdery mildew incidence on spring barley in the Wielkopolska province},
 URL={http://journals.pan.pl/Content/89282/PDF/JPPR_54(1)_05_Tratwal.pdf},
 doi={10.2478/jppr-2014-0005},
}