Research regarding the response of rapeseed hybrids to pathogens
Published in Scientific Papers. Series A. Agronomy, Vol. LV-2012
Written by Cristinel Relu ZALĂ, Stelica CRISTEA, Emil RADU, Mali-Sanda MANOLE, Viorel Adrian BĂLAŞU, Elena Camelia CLINCIU
One of the major factors which play a limiting role in rapeseed culture is represented by a number of pathogens that attack under favourable conditions (provided by abiotic factors), resulting in lower production. Five hybrids were tested: Elite, Elvis, ES Hydromel, ES Artist and ES Saphir, and observations were made under natural contamination in non-treatment variants, in order to analyze the reaction of the hybrids to major pathogens in 2009, 2010 and 2011. The results of the tests carried out during the three years of research on the five hybrids showed that the main diseases of rape, in order of economic importance, were: a).White rot on rape (Sclerotinia sclerotiorum Lib. De Bary); b) Early blight of rape (Alternaria brassicae Berk-Sacc.); c) Dry rot and canker of crucifers (Phoma lingam Tode ex Schw. Desm.); d) Powdery mildew of rape (Erysiphe communis Wallr.-Link). Research was conducted in the experimental fields of a private farm located at Fundulea. From the analysis of the data concerning the behaviour of rapeseed hybrids to pathogens investigated during the three years of study, we concluded that the order of pathogen occurrence in the field was: Phoma lingam, Alternaria brassicae, Erysiphe communis and Sclerotinia sclerotiorum; the most favourable conditions for most diseases were recorded in 2011, excepting common powder mildew (2009). From the present paper, it can be concluded that phytosanitary factors are among the main limiting factors of the rapeseed crop, particularly the attack produced by the fungi Sclerotinia sclerotiorum, Alternaria brassicae, Phoma lingam and Erysiphe communis.