Pathogens present on vegetative organs and seeds of white mustard (Sinapis alba L.) and chinese mustad (Brassica juncea L.)

Abstract

The research was conducted in the years 1999-2001. The aim of the research was to determine the health condition of overground parts and seeds of white niuslard (<i>Sinapis alba</i> L.) cv. Metex and chinese mustard (<i>Brassica juncea</i> L.) cv. Małopolska. In all the years of the research alternaria blight was found on the leaves of white mustard which injury index ranged from 5,6% in 2001 to 17,6% in 200O. The most dangerous disease of chinese mustard also was alternaria blight and its symptoms were found on leaves and siliques. The strongest infection of leaves was in 2000 (50%) and the weakest in 2001 (6,7%). In all the years of the research siliques were rather weak infected (50-8,89%). Besides powdery mildew was found on chinese mustard which injury index ranged from 0,3% in 1999 to 32,3% in 2000. Intensity of diseases was affected generally by the weather conditions. From the seeds of white mustard and chinese mustard were isolated respectively 263 and 137 colonies. <i>Alternaria alternata</i> was the most numerous species which makes respectively 60,9% and 42,3% isolates. Among the fungi pathogenic for white and chinese mustard were also isolated: <i>A. brassicae, Botrytis cinerea</i> and <i>Rhizoctonia solami</i>.