Blossom Blight of Guayule Caused by Alternaria infectoria. O. P. Sidhu, Tree Biology Department, National Botanical Research Institute, Lucknow 226 001, India. H. M. Behl, Tree Biology Department, National Botanical Research Institute, Lucknow 226 001, India. Plant Dis. 75:748-749. Accepted for publication 23 January 1991. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1991. DOI: 10.1094/PD-75-0748.

Alternaria infectoria caused severe “blossom blight” of several strains of Parthenium argentatum (guayule) growing in India. The pathogen was isolated from blighted capitula and its pathogenecity was established. This is the first report of blossom blight of guayule caused by A. infectoria and is also a first report on its recovery from a dicot.

Keyword(s): rubber crop.