Several early maturing lines of winter canola (Brassica napus L.) developed at Alabama A&M University were evaluated under controlled environment for resistance (or susceptibility) to several isolates of Leptosphaeria maculans. Susceptible and resistant canola cultivars were used as standards for comparisons. Canola seeds were germinated in Promix soil contained in covered flats inside a growth chamber. Seedlings at cotyledonary stage were used in the evaluation.