In April 1966, a sample of wheat grains was studied in order to determine the cause of the presence of "pink beny". It was not possible to determine the causal agent. Nervertheless, Alternaria tenuis Nees was isolated from grains that did not show that disturbance.
A pathogenecity test was carried out - in greenhouse - by inoculating headed healthy wheat plants with the pathogen. Upon reisolation and reclassification the presence of Alternaria tenuis Nees was established, in diseased tissue.
Symptoms on wheat straw were very similar to Septoria tritici Rob. ex Desm. symptoms on wheat leaves.
At the beginning, symtoms on leaves were very similar to those caused by Puccinia recondita Rob, and, later on, they resemble very much to those caused by Helminthosporium spp., on cereal leaves.
It seems convenient to extend this study in order to verify if this pathogen is the causal organism of the "brown necrosis" or "brown neck" wich we think is affecting our wheat.

1 Ingeniero Agrónomo M. S. Proyecto Fitopatología, Estación Experimental La Platina, Instituto de Investigaciones Agropecuarias. Profesor Cátedra Fitopatología, Facultades de Agronomía de las Universidades de Chile y Católica de Chile.