Florida Entomologist (2002) 85, 588-593

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Eduardo B. Beserra, Carlos T. Dos S. Dias and José R.P. Parra (2002)
Distribution and natural parasitism of Spodoptera frugiperda (Lepidoptera: Noctuidae) eggs at different phenological stages of corn
Florida Entomologist 85 (4), 588-593
Abstract: The oviposition behavior of Spodoptera frugiperda (J. E. Smith) and natural parasitism of this pest by Trichogramma spp. at different phenological stages of corn were evaluated under field conditions. The distribution of S. frugiperda eggs varied according to the phenological stage of the corn. The preferred site for oviposition was the lower region of the plant and the abaxial leaf surface during the early development stages of the crop (4-6 leaves), changing to the middle and upper regions of the plant and the adaxial leaf surface at subsequent stages (8-10 and 12-14 leaves). A larger number of egg masses, and, therefore, of eggs was collected at the 4-6 and 8-10 leaf stages compared to plants in the 12-14 leaf stages. Natural parasitism was low, with a maximum of 2.21% eggs parasitized, especially on the lower and middle parts of the plant. The distribution and degree of parasitism by Trichogramma spp. on different regions of the plant were independent of the developmental stage of the crop. Trichogramma pretiosum Riley was the most frequent parasitoid, found in 93.79% of the parasitized eggs, followed by Trichogramma atopovirilia Oltman and Platner, with 2.07%.

Se evaluó el comportamiento de la oviposición de Spodoptera frugiperda (J. E. Smith) y en el parasitismo natural de esta plaga por Trichogramma spp. a diferentes étapas fenológicas de maíz bajo condiciones del campo. La distribución de los huevos de S. frugiperda varió según la étapa fenológica del maíz. El sitio preferida para la oviposición fué la región inferior de la planta y la superficie abaxial (dorsal o del envez) de la hoja durante las étapas tempranas de desarrollo del cultivo (4-6 hojas), cambiando a las regiones medianas y superiores de la planta y la superficie adaxial (ventral o del haz) de la hoja en las étapas subsecuentes (8-10 y 12-24 hojas). Un mayor número de masas de huevos, y, por lo tanto, un mayor número de huevos fueron recolectados en las étapas de 4-6 y de 8-10 hojas en comparación con plantas en la étapa de 12-14 hojas. El parasitismo natural fué bajo, con un máximo de 2.21% de huevos parasitados, especialmente en las partes bajas y medias de la planta. La distribución y el grado de parasitismo por Trichogramma spp.en diferentes regiones de la planta fué independiente de la étapa de desarrollo del cultivo. Trichogramma pretiosum Riley fué el parasitoide más frecuentemente encontrado con el 93.79% de los huevos parasitados, seguido por Trichogramma atopovirilia Oltman and Platner, con el 2.07% de los huevos parasitizados.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Full text of article
Database assignments for author(s): Eduardo B. Beserra

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
environment - cropping system/rotation
Research topic(s) for beneficials or antagonists:
surveys/distribution/isolation


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Spodoptera frugiperda Maize/corn (Zea mays)
Trichogramma pretiosum (parasitoid) Spodoptera frugiperda Maize/corn (Zea mays)
Trichogramma atopovirilia (parasitoid) Spodoptera frugiperda Maize/corn (Zea mays)