Figueroa-Pérez, Lorimar

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    Dinámica poblacional de Spoladea recurvalis (F.) (Lepidoptera: pyralidae) y sus relaciones tritróficas con variaciones en la densidad poblacional de la peseta, Trianthema portulacastrum (L.).
    (2003) Figueroa-Pérez, Lorimar; González-Rodríguez, Ángel L.; College of Agricultural Sciences; González, Lizzette; Semidey, Nelson; Department of Crops and Agro-Environmental Sciences; Berríos, Ángel
    The weed “horse purslane” (Trianthema portulacastrum [L.]) may be completely defoliated by Spoladea recurvalis (F.) larva, but the lack of a temporal synchrony between them precludes that the competition exerted by the weed on vegetable crops is avoided. In field studies (2001-02) with varying densities of the weed conducted in the Agricultural Experiment Station in Juana Díaz and in studies in fallow plots located in Juana Diaz, Santa Isabel and Lajas, it was found that the population densities of S. recurvalis were directly related to the population density of the weed. The herbivore reached regulating densities when the weed attained almost a hundred percent ground coverage. Applications of Bt-based products reduced S. recurvalis larval densities, however, the reduction in larval densities did not preclude the eventual defoliation of the weed. The insect is present, with an aggregated distribution, throughout the year in the localities studied. In choice tests, larvae preferred to feed on “horse purslane” than on other weeds and did not feed on crops, except for sugar beet. The following hymenopterans parasitoids were identified attacking S. recurvalis: the braconids Apanteles sp., Cremnops sp. and Chelonus cautus Cresson, and the pteromalid Catolaccus sp. The chalcidid Spilochalcis sp. and the elasmid Elasmus sp. were found as hyperparasites of Apanteles.