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Studies on the biology of the palm aphid, Cerataphis variabilis (Homoptera: Pemphigidae), on Raphia hookeri–1: Developmental period of the immatures, fecundity and longevity of the apterous adults

Published online by Cambridge University Press:  08 April 2017

D. A. Enobakhare
D. A. Enobakhare
Affiliation:
Department of Agricultural Biology, University of Ibadan, Nigeria
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Abstract

The biology of the aphid, Cerataphis variabilis H.R.L., on Raphia hookeri Mann & Wendl., was studied in the laboratory and the field using a ‘clip-on’ cage and a sleeve cage. The first instar lasted 5.1 days. The second and third instars each lasted 2.45 days, while the fourth instar lasted 2.4 days. The total developmental period of the nymphs was 11.3 days at 26.4 ± 1.43°C and r.h. 83 ± 1.46%; 11.6 days at 26.4 ± 1.63°C and r.h. 85 ± 1.19%; 12.9 days at 27.9 ± 1.04°C and r.h. 75.5 ± 1.64%; 12.95 days at 27.8 ± 0.33°C and r.h. 69 ± 1.23%; 15 days at 21.4 ± 0.58°C and r.h. 45 ± 1.77%. These periods were significantly different at 5% level (LSD = 0.59 days). The higher the temperature and relative humidity the shorter the developmental period (with temperature: r = −0.69, 20.8–28.9°C; r.h.: r = −0.97, 43.2–86.2%). The number of progeny per adult ranged from 54 to 60 in a period of 28–31 days. The longevity ranged from 31 to 34 days.

Résumé

La biologie de l'aphis, Cerataphis variabilis (H.R.L.) sur Raphia hookeri (Mann & Wendl.) a été étudiée au laboratoire et aux champs en se servant de la cage ‘clip-on’ et d'une cage à manchon. Le premier ‘instar’ a duré 5,1 jours. Le deuxième et le troisième instars ont duré 2,45 jours respectivement tandis que le quatrième instar a duré 2,4 jours. La période totale de développement des nymphes était de 11,3 jours à 26,4 ± 1,43°C et r.h. 83 ± 1,46%; 11,6 jours à 26,4 ± 1,63°C et r.h. 85 ± 1,19%; 12,9 jours à 27,9±1,04°C et r.h. 75,5±1,64%; 12,95 jours à 27,8±0.33°C et r.h. 69±1,23%; 15 jours à 21,4±0.58°C et r.h. 45±1,77%. Ces périodes étaient différentes d'une manière significative au niveau de 5% (LSD = 0,59 jours). Plus la temperature et l'humidité relative montent, plus courte la période de développement (avec température: r = −0,69, 20,8–28,9°C; humidité relative: r = −0,97,43,2–86,2%). Le nombre de progéniture par adulte allait de 54–60 dans une période de 28–31 jours. La longévité allait de 31–34 jours.

Keywords

Cerataphis variabilisRaphia hookeriapterous adultslongevityfecundityCerataphis variabilisRaphia hookeriaptèrelongévitéfécondité
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 6 , Issue 2 , April 1985 , pp. 177 - 181
Copyright
Copyright © ICIPE 1985

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References

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