Determination of sexual dimorphism in the puparia of four whitefly pest species from India (Hemiptera: Aleyrodidae)
Baig Mohammed M., Dubey Anil K., Ramamurthy Vilayanoor V.
Acta Entomologica Musei Nationalis Pragae 56(2): 447-460, 2016
Abstract: We evaluated sexual dimorphism in puparia of four whiteflies, viz., Aleyrodes
sp. on Oxalis corniculata (Oxalidaceae), Bemisia tabaci (Gennadius, 1889) on
Solanum melongena (Solanaceae), Dialeurodes delhiensis David & Sundararaj,
1992 on Ficus virens (Moraceae), and Trialeurodes vaporariorum (Westwood, 1856)
on Phaseolus vulgaris (Fabaceae), based on a set of ten morphometric characters
analysed by univariate and multivariate statistics. Differences between males
and females in means of the selected ten characters and in several character
ratios were highly significant. The multivariate analyses including principal
component analysis (PCA) and canonical discriminant analysis (CDA) revealed that
sex can be reliably identified in puparia in these species based on a
combination of characters such as the length and width of puparia irrespective
of species; length of caudal furrow for Aleyrodes sp., D. delhiensis and T.
vaporariorum; length of the seventh abdominal segment for D. delhiensis and T.
vaporariorum; width of operculum alone for Aleyrodes sp.; and length of vasiform
orifice (LVO) alone for B. tabaci; and the combination of some of their ratios.
Identification of puparium sex is important for studies in taxonomy, biology and
pest management of whiteflies. The results of this study show that morphometrics
can provide a useful tool for its diagnosis and accurate identification.
Key words: Sternorrhyncha, Aleyrodomorpha, Aleyrodoidea, whiteflies, puparium, morphometrics, multivariate analyses, identification