Alternaria blight (A. helianthi)
and Brown spot of citrus (A. alternata pv. citri) are
serious diseases of sunflower (Theertha 2003) and citrus
fruits (Vicent et al. 2004), respectively, in India as
well as in many parts of the world. Alternaria-infected
fruits are unmarketable due to lesions, resulting in
important economic losses (Vicent et al. 2000). A. porri
infection may provide entrance to bacteria that cause
bulb decay in storage.