Disease Note

Tomato Spotted Wilt Virus Resistance in Capsicum chinense PI 152225 and 159236. L. L. Black, Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge 70803. H. A. Hobbs, and J. M. Gatti, Jr. Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge 70803. Plant Dis. 75:863. Accepted for publication 18 April 1991. Copyright 1991 The American Phytopathological Society. DOI: 10.1094/PD-75-0863A.

Greenhouse evaluations of pepper (Capsicum spp.) lines for reactions to tomato spotted wilt virus (TSWV) led to identification of two TSWV-resistant C. chinense Jacquin accessions, PI 152225 and PI 159236. Plants of both accessions developed concentric necrotic local lesions on mechanically inoculated leaves and cotyledons. Inoculated cotyledons generally abscised within 1 wk; inoculated leaves that developed numerous local lesions also abscised. Necrosis remained confined to inoculated leaves and cotyledons in most plants, although an occasional plant developed systemic necrosis. Symptomless foliage above the inoculated leaves tested negative for TSWV by ELISA. The accessions responded similarly to seven Louisiana TSWV isolates recovered from pepper, tomato, and weed species. Progeny derived from selfed plants of the two accessions that showed local lesions reacted the same as the parent plants when inoculated with TSWV. Some progeny derived from crosses between the accessions and TSWV-susceptible C. annuum L. lines developed local lesions, suggesting that the resistance is heritable.