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SCIRTOTHRIPS DORSALIS (THYSANOPTERA: THRIPIDAE): SCANNING ELECTRON MICROGRAPHS OF KEY TAXONOMIC TRAITS AND A PRELIMINARY MORPHOMETRIC ANALYSIS OF THE GENERAL MORPHOLOGY OF POPULATIONS OF DIFFERENT CONTINENTS

Vivek Kumar, Dakshina R. Seal, David J. Schuster, Cindy McKenzie, Lance S. Osborne, James Maruniak and Shouan Zhang
The Florida Entomologist
Vol. 94, No. 4 (December, 2011), pp. 941-955
Stable URL: http://www.jstor.org/stable/23065852
Page Count: 15
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
SCIRTOTHRIPS DORSALIS (THYSANOPTERA: THRIPIDAE): SCANNING ELECTRON MICROGRAPHS OF KEY TAXONOMIC TRAITS AND A PRELIMINARY MORPHOMETRIC ANALYSIS OF THE GENERAL MORPHOLOGY OF POPULATIONS OF DIFFERENT CONTINENTS
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Abstract

The chilli thrips, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae) is an emerging pest of many economically important vegetable and ornamental crops grown in the United States. Accurate identification of this pest is a fundamental requirement in development of effective quarantine and management strategies. Using scanning electron microscopy, high resolution images of important taxonomic traits of this pest were produced, which will aid research, regulatory and extension personnel to identify this pest. High resolution images were obtained for identifying characters of S. dorsalis including tergites with antecostal ridges; head with 3 pairs of ocellar setae, metanotum presenting longitudinal striations with medially located pair of setae; veins of forewing presenting widely spaced setae; segment VIII with complete posteromarginal comb of microtrichia; and sternites lacking discal setae but covered with rows of microtrichia except in the antero-medial region. Further, a preliminary comparison of morphological traits of S. dorsalis populations from different geographical regions was conducted, which can help in understanding the phenotype of this pest. Specimens of S. dorsalis were obtained from 5 distinct geographical regions: New Delhi, India; Shizouka, Japan; Negev, Israel; St. Vincent and Florida in the United States. Fourteen morphological characters of each population of S. dorsalis were measured and compared among the 5 populations. No significant differences were observed between the body lengths of the various S. dorsalis populations, which ranged from 0.85 mm (Negev) to 0.98 mm (Florida). When comparing 12 morphological characters, we found no significant differences among New Delhi, St. Vincent, Negev and Florida populations. However, when S. dorsalis populations of these 4 regions were compared with Shizouka, significant differences were detected for either 2 or 5 morphological characters depending on the population, suggesting the Japan population is more robust i.e., longer and wider mesothorax and metathorax, and wider abdomens. Also, the mean lengths of body size among different populations did not vary directly or inversely with latitude. El trips de pimiento, Scirtothrips dorsalis Hood (Thysanoptera: Thripidae) es una plaga emergente de muchos cultivos horticolas y ornamentales de importancia económica en los Estados Unidos. La identificación exacta de esta plaga es un requisito fundamental en el desarrollo de cualquier estrategia eficaz de cuarentena y de gestión. Usando la imagen de microscopio electrónico de barrido de alta resolución de esta plaga se produjo lo que se ayuda de los productores y el personal de extensión para identificar esta plaga con gran facilidad. Además, una comparación de las características morfológicas de las poblaciones de S. dorsalis de diferentes regiones geográficas se llevó a cabo lo que puede ayudar en la comprensión del fenotipo de esta plaga. Se obtuvieron especímenes de S. dorsalis de cinco regiones geográficas distintas: Nueva Delhi, India; Shizouka, Japan; Negev, Israel; St. Vincent y la Florida en los Estados Unidos. Se medido y se compararon catorce caracteres morfológicos de cada población de S. dorsalis entre las cinco poblaciones. No se observaron diferencias significativas entre la longitud del cuerpo de las diferentes poblaciones de S. dorsalis, que varia entre 0.85 mm (Negev) a 0.98 mm (Florida). Al comparar los 12 caracteres morfológicos, no se encontraron diferencias significativas entre las poblaciones de Nueva Delhi, San Vicente, Negev y de la Florida. Sin embargo, cuando se compararon las poblaciones de S. dorsalis de estas cuatro regiones con la poblacion de Shizouka, se detectaron diferencia significativas en 2 o 5 caracteres morfológicos según la población, la cual indica que la población de Japón es mas robusta (es decir, el mesotórax y el metatórax son más largos y anchos, el abdomen es más ancho). Además, el promedio de la longitud del cuerpo entre las poblaciones no varía en relación directa o inversamente con la latitud geográfica.

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