Frankliniella occidentalis (Thysanoptera: Thripidae) landing and resistance to tomato spotted wilt tospovirus among Lycopersicon accessions with additional comments on Thrips tabaci (Thysanoptera: Thripidae) and Trialeurodes vaporariorum (Homoptera: Aleyrodidae)
1995
Krishna Kumar, N.K. | Ullman, D.E. | Cho, J.J.
Thirteen Lycopersicon accessions were compared for landing of the western flower thrips, Frankliniella occidentalis (Pergande), on leaves and flowers and resistance to tomato spotted wilt tospovirus (TSWV) in field experiments on the Hawaiian island of Maui. Occurrence of the onion thrips, Thrips tabaci Lindeman, and the greenhouse whitefly, Trialeurodes vaporariorum (Westwood), on leaves was also recorded. Adult western flower thrips occurred on all Lycopersicon accessions, and no significant difference was found among accessions in western flower thrips landing per leaf. Significant differences were found among accessions with regard to number of western flower thrips occurring per flower and incidence of TSWV. Landing of onion thrips and greenhouse whitefly on leaves varied significantly among accessions. Lycopersicon esculentum Mill. 'Anahu' was the only accession infected with TSWV at the foliar stage. L. esculentum 'Pearl Harbor', L. parviflorum (Jusl.) Mill., and L. hirsutum Humb. and Bonpl. were infected after flowering, and TSWV infection was not observed in L. peruvianum (L.) Mill., L. hirsutum f. glabratum C. H. Mull., L. chmielewskii Rick et al., L. pennellii, L. pimpinellifolium (Jusl.), and L. chilense Dun. even after 7 mo in the field, suggesting field resistance in these accessions. Among L. esculentum cultivars, 'Rey de los Tempranos' was the only accession that did not become infected with TSWV. Because thrips landing did not correlate with TSWV infection in our experiment, we suggest that TSWV susceptibility and thrips feeding after landing are likely more important in influencing virus incidence under field conditions than landing behavior or direct resistance to insect colonization.
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