REACTION OF Brassica SPECIES TO INFECTION BY Alternaria brassicae

Abstract

Thirty-five cultivars/strains belonging to six Brassica species were evaluated for their reaction to Alternaria brassicae under laboratory conditions. Detached leaves were wounded and inoculated with a spore suspension, and incubated at room temperature for 4 d. Lesion diameter was used as an indicator of resistance. The smallest lesions were observed in B. carinata, followed by, in order of increasing lesion size, B. oleracea, B. napus, B. campestris, B. juncea, and B. nigra. Intraspecific differences for lesion size occurred in B. napus, B. campestris, B. juncea, and B. oleracea.Key words: Brassica, Alternaria brassicae, summer rape, summer turnip rape, mustard