At 48 h after inoculation (EGTA pre-injection) (A). At 72 h after inoculation (EGTA pre-injection) (B). Development of HR and P. triticina at 96 h after inoculation (EGTA pre-injection) (C). Development of HR and P. triticina at 120 h after inoculation (EGTA pre-injection) (D). At 48 h after inoculation (imidazole pre-injection) (E). At 72 h after inoculation (imidazole pre-injection) (F). Development of HR and P. triticina at 96 h after inoculation (imidazole pre-injection) (G). Development of HR and P. triticina at 120 h after inoculation (imidazole pre-injection) (H). Transmitted light photograph of A (a). Transmitted light photograph of B (b). Transmitted light photograph of E (e). Transmitted light photograph of F (f). haustorium mother cell (c). (A, B, a, b, E, F, e, f: Bar = 50 μm; C, D, G, H: Bar = 37.5 μm)