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dc.contributor.authorCardona Mejía, César
dc.contributor.authorMiles, John W.
dc.contributor.authorZuniga, G
dc.contributor.authorSotelo, G
dc.date.accessioned2014-09-24T07:58:50Z
dc.date.available2014-09-24T07:58:50Z
dc.date.issued2010
dc.identifier.issn1938-291X
dc.identifier.urihttps://hdl.handle.net/10568/42967
dc.description.abstractBoth nymphal and adult spittlebugs (Hemiptera: Cercopidae) cause serious economic damage to susceptible brachiariagrass [genus Biachiaria (Trin.) Griseb], pastures in tropical America. Both life stages are xylem feeders: nymphs feed primarily on roots and stems, whereas the adults feed mainly on foliage. Numerous interspecific brachiariagrass hybrids with high levels of antibiosis resistance to nymphs of several important spittlebug species have been obtained. Recent studies revealed major inconsistencies between reaction to nymphs and reaction to adults on the same host genotype. Because both insect life stages can cause severe economic damage on susceptible brachiariagrass pastures, a cultivar development strategy must take into account resistance to both life stages. To assess the degree of association between resistance to spittlebug nymphs and to adult feeding, we tested 164 hybrids and six check genotypes for resistance to both life stages of three spittlebug species: Aeneolamia varia (F.), Aeneolamia reducta (Lallemand), and Zulia carbonaria (Lallemand). Most hybrids tested were classified as resistant to nymphs. On the contrary, for all three species, the overall mean damage score of the 164 hybrids did not differ from the mean score of the susceptible checks. None of the hybrids was classified as resistant to adult feeding damage. Correlations between percentage nymph survival and adult damage scores were consistently low (r = 0.0104–0.0191). Correlations between nymphal and adult damage scores were also low (0.109–0.271), suggesting that resistances to the different life stages are largely independent. Chi-square analyses comparing frequency distributions of responses of the 164 breeding hybrids to nymphs or adults confirmed essential genetic independence of these two traits. We conclude that attention to improving genetic resistance specifically to adult feeding damage is warranted.
dc.language.isoen
dc.sourceJournal of Economic Entomology
dc.subjectBRACHIARIA
dc.subjectCERCOPIDAE
dc.subjectHOST PLANTS
dc.subjectAENEOLAMIA
dc.subjectPEST RESISTANCE
dc.subjectPLANT INJURIES
dc.subjectHYBRIDS
dc.subjectGENOTYPES
dc.subjectGENETIC RESISTANCE
dc.subjectBRACHIARIA
dc.subjectCERCOPIDAE
dc.subjectPLANTAS HUÉSPEDES
dc.subjectAENEOLAMIA
dc.subjectRESISTENCIA A LAS PLAGAS
dc.subjectDAÑOS A LA PLANTA
dc.subjectHÍBRIDOS
dc.subjectGENOTIPOS
dc.subjectRESISTENCIA GENÉTICA
dc.titleIndependence of Resistance in Brachiaria spp. to Nymphs or to Adult Spittlebugs (Hemiptera: Cercopidae): Implications for Breeding for Resistance
dc.description.versionPeer-reviewed
dc.typeJournal Article
cg.subject.ciatGENETIC RESOURCES
cg.subject.ciatPESTS AND DISEASES
cg.identifier.statusLimited Access
cg.identifier.urlhttp://www.bioone.org/doi/abs/10.1603/EC10004?journalCode=ecen
cg.identifier.doihttps://dx.doi.org/10.1603/EC10004
cg.isijournalISI Journal


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