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Growth, Development and Life Cycle of Icerya pattersoni (Newstead) (Homoptera: Margarodidae), a Coffee Pest in Kenya

Published online by Cambridge University Press:  19 September 2011

M. W. Kinuthia  and
R. W. Mwangi
M. W. Kinuthia
Affiliation:
Coffee Research Foundation, P.O. Box 4, Ruiru
R. W. Mwangi*
Affiliation:
Zoology Department, University of Nairobi, P.O. Box 30197, Nairobi
*
* To whom all correspondence should be addressed.
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Abstract

Experiments carried out in a coffee plantation to determine the developmental period of Icerya paltersoni (Newst.) showed that the female and male scales lasted 157 and 129 days on average, respectively. The different stages of I. pattersoni females were found to be recognizable by the number of antennal segments. The antenna of the stage I nymphal instar is six segmented, stage II is nine segmented and stage III is eleven segmented. The antenna of adult males is eighteen segmented. Females are neotenic but the males possess a pair of grey wings and atrophied mouthparts. In the field the I. pattersoni pest population size is highest in the heavy rainfall months of April and May.

Résumé

Les expériences menées pour détermine la période de dévelopment de Icerya pattersoni (Newst.) sur la variété du café SL 28 ont montré que les échelles des males et des fameules onto duré 157 et 129 jours en moyenne, respectivement. La maturité de la plante s'est montrée a influer sur le dévelopment et la fécondité moyenne de l'échelle. Les jeunes plantes étant moins favorables que les plantes mûres. Les étapes différentes des fameules J. pattersoni se sont montrées identifiables par le nombre des ségments anténaux. Le “nymphal instar antenna” de l'Etape I a six ségements, de l'Etape II neuf ségments et de l'Etape III onze ségments. L'antenne des males adults a dixhuit ségments. Les fameules sont “neotenic” mais les males possedent un paire des ailes grises et des parties de boucheatrophiées.

Keywords

Icerya pattersonicoffeescaleHomopteraneoteny
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 9 , Issue 1 , February 1988 , pp. 69 - 72
Copyright
Copyright © ICIPE 1988

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References

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