Resistance to Peanut Rust in Wild Arachis Species. P. Subrahmanyam, Plant Pathologist, Genetic Resources Unit, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru P.O., Andhra Pradesh 502 324, India. J. P. Moss, Principal Cytogeneticist, Groundnut Improvement Program; and V. R. Rao, Botanist, Genetic Resources Unit, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru P.O., Andhra Pradesh 502 324, India. Plant Dis. 67:209-212. Accepted for publication 10 July 1982. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-209.

Sixty-one accessions of wild species, representing five sections of the genus Arachis, were tested under field and laboratory conditions for reaction to peanut rust (Puccinia arachidis). Most of them were immune, six were highly resistant, and two were susceptible to the pathogen. Immunity to peanut rust occurred in all sections, but susceptibility occurred in only one of the five sections represented and in one species of a section of unknown affinity in the genus.