Fig. 5.

(A) Total necrotic leaf area versus linear thermal time since seedling emergence, for leaves 1–6, as indicated, counted from the top of the main stem of wheat plants not treated with fungicide; (B) total necrotic leaf area versus linear thermal time for leaf 1, leaf 2, leaf 5 and leaf 6, as indicated in the key in (A), of main stem from wheat plants not treated (continuous line, closed symbols) and treated (dotted line, open symbols) with fungicide. Data are for winter wheat ‘Soissons’ grown in Grignon in 2008/09 at the intermediate density (D2, 160 plants m⁻²). Vertical dashed lines correspond to dates of fungicide treatment.