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dc.contributor.authorLeón, Ramón G.es_ES
dc.contributor.authorIzquierdo, Jordies_ES
dc.contributor.authorGonzález-Andújar, José Luises_ES
dc.identifier.citationWeed Science 63(3): 623-630 (2015)es_ES
dc.description.abstractItchgrass is an aggressive weed species in tropical agroecosystems. Because of phytosanitary restrictions to exports, pineapple producers must use a zero tolerance level for this species. An understanding of itchgrass seedling emergence would help producers to better time POST control. The objective of the present study was to characterize itchgrass seedling emergence patterns and develop a predictive model. Multiple field experiments were conducted in four agricultural fields in Costa Rica between 2010 and 2011 for a total of 9 site-years. Itchgrass consistently showed a biphasic emergence pattern, with a first emergence phase that was faster and more consistent across site-years than the second one. Weibull + logistic models based on chronological time (R 2 adj = 0.92) and thermal time with T base = 20 C (R 2 adj = 0.92) provided the best fit for the combined emergence data for two experimental locations in 2010. Both models predicted itchgrass seedling emergence adequately for most site-years, but the thermal-time model was more accurate (R 2 adj = 0.64 to 0.86) than the chronological model (R 2 adj = 0.31 to 0.74), especially when temperatures were high. Both models showed high accuracy in the first emergence phase but tended to underestimate emergence rate during the second phase. The models predicted 50% emergence at 14 d or 80 growing degree days and the stabilization of the first emergence phase at approximately 25 d or 200 growing degree days. Thus, these models can be used to properly time itchgrass POST control. More research is needed to understand the regulatory mechanisms responsible for the variability of the second emergence phase.es_ES
dc.description.sponsorshipThis research was supported by the Spanish Agency of International Development Cooperation (A/023032/09 and A/030511/10), European Regional Development Funds, and the Spanish Ministry of Education and Science (project AGL2009-07883).es_ES
dc.publisherWeed Science Society of Americaes_ES
dc.subjectGrowing degree dayses_ES
dc.subjectIntegrated managementes_ES
dc.subjectSeed bankes_ES
dc.titleCharacterization and Modeling of Itchgrass (Rottboellia cochinchinensis) Biphasic Seedling Emergence Patterns in the Tropicses_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.contributor.funderMinisterio de Asuntos Exteriores y Cooperación (España)es_ES
dc.contributor.funderEuropean Commissiones_ES
dc.contributor.funderMinisterio de Educación y Ciencia (España)es_ES
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