Occurrence and characterization on wheat of the Alternaria infectoria complex associated with black point and leaf blight symptoms in Argentina.

PERELLÓ, A. E.; MORENO M. V.; SISTERNA, M. N.,; CASTRO, A. M.

Mar del Plata, Argentina

Congreso; 7th International Wheat Conference.; 2005

The aims of this work were to examine this new symptomathology on wheat plants and to characterize the species-group involved based on morphological, chemical and pathogenic characteristics.A collection of 410 isolates were collected from infected leaves of seventeen different geographical sites of the argentinian cropping area.  In the pathogenicity tests, showed cultivar B. Charrúa as the one of the best behaviour against all the isolates tested, and cvs. Pro INTA Cinco Cerros and Pro INTA Elite as the  most susceptible. Symptoms observed were: chlorosis and/or apical or general necrosis (blight), or elongated necrotic spots sorrounded by chlorotic halo. The results obtained revealed differences between the  strains in the isozyme banding patterns.