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Association of Frankliniella fusca and three winter weeds with tomato spotted wilt virus in Louisiana

Johnson, R.R., Black, L.L., Hobbs, H.A., Valverde, R.A., Story, R.N., Bond, W.P.
Plant disease 1995 v.79 no.6 pp. 572-576
Ranunculus sardous, Lactuca, Sonchus asper, weeds, disease reservoirs, Tomato spotted wilt virus, overwintering, winter, spring, isolation, detection, Frankliniella fusca, disease vectors, Louisiana
Random surveys of three common winter weed species using the enzyme-linked immunosorbent assay (ELISA) and vector transmission studies demonstrated that tomato spotted wilt tospovirus (TSWV) overwinters in Louisiana. Natural TSWV infection in Ranunculus sardous, Lactuca floridana, and Sonchus asper was detected by ELISA during the winter months and prior to spring vegetable production periods. Recovery of thrips from R. sardous, L. floridana, and S. asper washings yielded all developmental stages of Frankliniella fusca during the winter and spring. Ranunculus sardous appeared to be the species most often associated with natural TSWV infection and thrips during the winter and prior to spring production periods. Frankliniella fusca adults collected from Ranunculus spp. from three areas transmitted TSWV to tomato. Other TSWV-vectoring thrips species known to occur in Louisiana were not detected in association with the weed species studied during the winter and spring months. Results of this study suggest that F. fusca is an important vector of TSWV in Louisiana.