Base de dados : MEDLINE
Pesquisa : B01.650.940.800.575.912.250.100.631 [Categoria DeCS]
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[Au] Autor:Esquivel JF; Esquivel SV
[Ad] Endereço:USDA-ARS, SPARC, Areawide Pest Management Research Unit, 2771 F&B Rd., College Station, TX 77845, USA.
[Ti] Título:Identification of cotton fleahopper (Hemiptera: Miridae) host plants in central Texas and compendium of reported hosts in the United States.
[So] Source:Environ Entomol;38(3):766-80, 2009 Jun.
[Is] ISSN:0046-225X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The cotton fleahopper, Pseudatomoscelis seriatus (Reuter), is an early-season pest of developing cotton in Central Texas and other regions of the Cotton Belt. Cotton fleahopper populations develop on spring weed hosts and move to cotton as weed hosts senesce or if other weed hosts are not readily available. To identify weed hosts that were seasonably available for the cotton fleahopper in Central Texas, blooming weed species were sampled during early-season (17 March-31 May), mid-season (1 June-14 August), late-season (15 August-30 November), and overwintering (1 December-16 March) periods. The leading hosts for cotton fleahopper adults and nymphs were evening primrose (Oenothera speciosa T. Nuttall) and Mexican hat [Ratibida columnifera (T. Nuttall) E. Wooton and P. Standley], respectively, during the early season. During the mid-season, silver-leaf nightshade (Solanum elaeagnifolium A. Cavanilles) was consistently a host for fleahopper nymphs and adults. Woolly croton (Croton capitatus A. Michaux) was a leading host during the late season. Cotton fleahoppers were not collected during the overwintering period. Other suitable hosts were available before previously reported leading hosts became available. Eight previously unreported weed species were documented as temporary hosts. A compendium of reported hosts, which includes >160 plant species representing 35 families, for the cotton fleahopper is provided for future research addressing insect-host plant associations. Leading plant families were Asteraceae, Lamiaceae, and Onagraceae. Results presented here indicate a strong argument for assessing weed species diversity and abundance for the control of the cotton fleahopper in the Cotton Belt.
[Mh] Termos MeSH primário: Gossypium
[Mh] Termos MeSH secundário: Animais
Estados Unidos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:0908
[Cu] Atualização por classe:090610
[Lr] Data última revisão:
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:090611
[St] Status:MEDLINE

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[Au] Autor:Seastedt TR; Suding KN
[Ad] Endereço:Institute of Arctic and Alpine Research, Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, CO 80309-0450, USA.
[Ti] Título:Biotic constraints on the invasion of diffuse knapweed (Centaurea diffusa) in North American grasslands.
[So] Source:Oecologia;151(4):626-36, 2007 Apr.
[Is] ISSN:0029-8549
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Knapweeds (Centaurea spp.) are among the most invasive of non-indigenous plant species that have colonized western North America over the last century. We conducted a 4-year experiment in a reconstructed grassland to test hypotheses related to the ability of grasslands to resist the invasion of diffuse knapweed (C. diffusa). We experimentally invaded C. diffusa and three native species into areas where we manipulated soil nitrogen (N) and phosphorus (P) availability and removed extant grasses to reduce competition. We evaluated the growth response of these species to these resources and competitive manipulations. Of the native species that were experimentally added, only one species, Ratibida pinnata (prairie coneflower), established in any numbers. Establishment values in intact vegetation were low for both species, but establishment by C. diffusa (0.02%) clearly outperformed that of R. pinnata (0.001%). Under reduced grass competition, establishment was enhanced, but the values for C. diffusa (0.68%) were not statistically different from those of R. pinnata (0.57%). Neither species performed better under higher soil nutrients in the presence of competing grasses. In plots with both species, biomass of the two planted species was positively correlated, but the biomass of both species was negatively correlated with non-added weedy species. Subsequent harvests of C. diffusa indicated that establishment was enhanced in treatments with higher soil nutrients but that the biomass of these plants could only be enhanced when plant competition was also reduced. These results indicate that C. diffusa can establish in intact grasslands at rates higher than natives, but opportunism rather than competitive ability best describes the invasiveness of C. diffusa. Thus, the mechanisms contributing to the establishment of this knapweed species are different from factors identified as contributing to the dominance of this invader.
[Mh] Termos MeSH primário: Centaurea/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Poaceae
Ratibida/crescimento & desenvolvimento
[Nm] Nome de substância:
0 (Soil)
[Em] Mês de entrada:0706
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:070112
[St] Status:MEDLINE

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