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Arabidopsis spp. Armoracia rusticana Arabis spp. Aubretia spp. Brassica alba B. arvensis B. alboglabra B. chinensis B. juncea B. kaber B. hirta B. fructiculosa B. napus B. napus var. napobrassica B. nigra B. oleracea var. acephala B. oleracea var. botrytis B. oleracea var. capitata B. oleracea var. caularapa B. oleracea var. gemmifera B. oleracea var. gengyloides B. pekinensis B. campestris var. rapifera B. campestris var. yellow sarson B. campestris var. brown sarson B. campestris var. toria Chenopodium album B. tournefortii Barbarea Camelina sativa Cheiranthus allioni C. cheiril Capsella brusa-pasteris Cardamine impatiens C. rhomboidea Coronapus didymus C. squamatus Crambe maritima Dentaria spp. D. laciniata Descurainia spp. Draba spp. D. caroliniana Eruca sativa Hesperis spp. Horseradish Rockcress Aubretia White mustard Wild mustard Chinese kale Chinese cabbage Mustard White mustard White mustard Rape Swedes Black mustard Marrow stem kale Cauliflower Cabbage Brussels sprouts Kohlrabi Chinese cabbage Turnip Yellow sarson Brown sarson

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INDEX WORDSLinum usitatissimum L., linseed, Oidium lini, powdery mildew, resistance, inheritance. SUMMARYResistance to powdery mildew (Oidium lini) in each of the four linseed cultivars, viz., LC 216, LC 255, LC 256 and LC 269 was found to be conditioned by one dominant gene. Crosses between the resistant parents indicated that the same gene was present in all the cultivars and is designated as Ol.