Resistance of Capsicum spp. Genotypes to Tobacco Etch Potyvirus Isolates from the >Western Hemisphere. I. Ariyaratne, Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge 70803. H. A. Hobbs, R. A. Valverde, L. L. Black, and D. J. Dufresne, Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge 70803. Plant Dis. 80:1257-1261. Accepted for publication 19 July 1996. Copy right 1996 The American Phytopathological Society. DOI: 10.1094/PD-80-1257.

Thirty-six isolates of tobacco etch potyvirus (TEV) from the United States, Mexico, the Caribbean, and Central and South America were mechanically inoculated in the greenhouse to selected pepper genotypes reported to have resistance to one or more TEV isolates. Some resistant genotypes were resistant (symptomless) to most isolates, while other genotypes were resistant to few isolates. Certain TEV isolates infected most of the resistant genotypes, while others infected very few. Other isolates represented gradations between the extremes. Reactions of specific pepper genotypes to specific TEV isolates sometimes varied in the different experiments of the study, possibly due to temperature and light intensity effects on resistance during the different times of the year in which experiments were carried out. Genotypes Agronomico 10C-5, Delray Bell, VR4, Jaloro, and PI 152225 were resistant to many TEV isolates tested and appear to be good sources of resistance for use in breeding programs.