Area under the disease (Mycosphaerella pinodes) progress curve (AUDPC) on pods, calculated between end of flowering (EF) and physiological maturity, as a function of node position in (a) 1999 and (b) 2000 and as a function of height of insertion on the stem in (c) 1999 and (d) 2000 for four spring pea cultivars (Athos, Bridge, Obelisque and Solara) in field experiments