Average disease severity of mature canola plants grown from seedlings inoculated with fungicide resistant (14P286-14P291) or control (D13) Leptosphaeria maculans isolates.

Seedlings (bare or fluquinconazole-treated) were inoculated with individual isolates and then allowed to grow through to maturity before being assessed for disease severity at the crown of the plant. For cultivars Westar and Pioneer SturtTT, the fungicide resistant isolates cause significantly more disease than the sensitive isolate, D13, in stems of plants grown from fluquinconazole-treated seedlings. No significant differences were observed for ATR-Stingray due to the low levels of disease detected in all isolates. Disease severity was determined as an average of 12 plants.