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Bionomics, morphometrics and molecular characterization of a cassava Bemisia afer (Priesner & Hosny) population

Published online by Cambridge University Press:  28 February 2007

M.N. Maruthi ,
S. Navaneethan ,
John Colvin  and
Rory J. Hillocks
M.N. Maruthi*
Affiliation:
Plant, Animal and Human Health Group, Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent, ME4 4TB, UK
S. Navaneethan
Affiliation:
Plant, Animal and Human Health Group, Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent, ME4 4TB, UK
John Colvin
Affiliation:
Plant, Animal and Human Health Group, Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent, ME4 4TB, UK
Rory J. Hillocks
Affiliation:
Plant, Animal and Human Health Group, Natural Resources Institute, University of Greenwich, Central Avenue, Chatham Maritime, Kent, ME4 4TB, UK
*
*Email: M.N.Maruthi@greenwich.ac.uk
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Abstract

Bionomics, morphometric measurements and partial mitochondrial cytochrome oxidase I gene (mtCOI) sequences were examined for a population of Bemisia afer (Priesner & Hosny) (Hemiptera: Aleyrodidae) collected from cassava in Uganda. The development of the eggs, first to fourth instar nymphs and adults required respectively, 12, 31 and 10 days, with a total life duration of approximately 53 days on the cassava cultivar Ebwanateraka. Each female laid one egg per day for 13 days and about 40% of the eggs failed to develop into adults. The male: female sex ratio was 1:4. The length and width of the four nymphal instars were positively correlated (correlation coefficient=0.97). Females were bigger than males and the sexes differed significantly based on body length (P<0.001) and width (P<0.001). Overlaps in their body sizes, however, makes sex assignment based on size alone unreliable. The B. afer population shared 68% mtCOI sequence (817 nucleotides) identity with a cassava Bemisia tabaci population (Namulonge) from Uganda. This is the first study on B. afer fecundity and morphometrics, and the variability that might exist in this species is discussed.

Keywords

Aleyrodidaecassavacytochrome oxidase I genefecunditywhiteflyBemisia after
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 24 , Issue 4 , December 2004 , pp. 323 - 329
Copyright
Copyright © ICIPE 2004

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