Browsing by Autor "Ileana Miranda"

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    Competencia de Diaphorina citri Kuwayama y Phyllocnistis citrella Stainton en el agroecosistema citrícola de la Isla de la Juventud, Cuba
    (2007) Miriam Fernández; Ileana Miranda; María Elena Díaz
    Phyllocnistis citrella Stainton (Lepidoptera: Gracillariidae: Phyllocnistinae), (MHC) is one of the most dangerous phytophages in Citrus. It first was detected in Isla de la Juventud on December 1993 and later, Diaphorina citri Kuwayama (Hemiptera: Psyllidae) invaded the crop on February 1999. This insect is as dangerous as P. citrella. The low population density of this pest and the high population density of D. citri suggested the competitive displacement between both species. In order to verify this, a two year old field was sampled weekly; and live miners and psylid populations on the buds of 30 plants previously fixed at ramdon were counted from March 2002 to March 2003. Lotka–Volterra s interspecific competence model was used. The model out come showed that Phyllocnistes citrella was displaced by D. citri because the steepness of the interespecific line (D. citri) lied above that intraespecific line (Phyllocnistes citrella). Plotting population densities of both species were proved in the time. (
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    DISTRIBUCIÓN ESPACIAL DE Phyllocnistis citrella STAINTON SOBRE PATRONES DE CÍTRICOS EN EL VIVERO DE LA ISLA DE LA JUVENTUD
    (2007) María Elena Díaz; Miriam Fernández; Ileana Miranda; J.L. Suescún Gómez; Carlos Armando Rodríguez; José N. Pérez; Haydé García
    One of the problems for fresh fruit production in citrus plantations is pest occurrence, e.g. Phyllocnistis citrella Stainton (Lepidoptera: Gracillaridae) detected in Cuba in 1993. It has been considered as one of the most harmful pests of this crop due to the damages caused by larvae in the leaves, sprouts and fruits. To known the dispersion tendency of P. citrella is of so much interest for taking samples and the sampling method. The study was carried out in the Isla de la Juventud nursery on Rugoso, Carrizo and Troyer patterns, from June 1996 to February 1997. Samplings took place weekly in 30 plants previously fixed at random until the they were grafted. A vegetative sprout was taken and the development state and total population of P. citrella were quantified in the pattern studied. Data were evaluated according to Taylor s power law. Results showed that P. citrella distribution pattern was aggregated for the three patterns studied. Variability was found for development state of the insect in the space distribution pattern since eggs and larvae showed aggregation and pupae showed uniform dispersion. This result constitutes a premise to use a good sampling method of P. citrella in the citrus cultivation of Isla de la Juventud. (