FUSARIUM YELLOWS AND TURNIP MOSAIC-VIRUS RESISTANCE IN BRASSICA-RAPA AND BRASSICA-JUNCEA

Thirty-seven Brassica rapa L. and B. juncea L. lines from nine subspec ies were tested for their reaction to two pathotypes of Fusarium yello ws (Fusarium oxysporum Schlecht. f. sp. conglutinans (Wr.) Snyd. & san s. race 1 and F.o. f. sp. raphani Kend. & Snyd. A subset of 16 lines f rom these same vegetable types, were tested for their reaction to four strains of turnip mosaic virus (TuMV-C1, C2, C3, and C4). Resistance to both Fusarium pathotypes was widespread in these Brassica subspecie s, whereas resistance to any strain of TuMV was uncommon. The broad av ailability of resistance to Fusarium yellows and scarcity of resistanc e to TuMV necessitate different approaches to obtain disease-resistant cultivars.