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Aspects of the biology of Orthezia insignis Browne (Ortheziidae: Homoptera) infesting Hamelia sphaerocarpa Ruiz & Pav. (Rubiaceae) in Uganda—II. Infestation and feeding behaviour

Published online by Cambridge University Press:  19 September 2011

J. S. O. Epila
J. S. O. Epila
Affiliation:
Department of Forestry, Faculty of Agriculture & Forestry, Makerere University, P.O. Box 7062, Kampala, Uganda
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Abstract

Simultaneously or selectively, nymphs and adults of Orthezia insignis used physiological age of the host-units, the relative sizes of sap pathways and the concentration of photosynthates to choose feeding and/or oviposition sites, depending on the state of the host plant. On the non-flowering plants, physiological age and relative sizes of pathways were the principal determinants, while on flowering food plants all the three criteria were used although the sink-photosynthate-concentration factor had a decidedly dominant influence on Orthezia than otherwise.

Résumé

Simultanément ou sélectivement des nymphes et des adultes de Orthezia insignis se sont servis de l'âge physiologique de l'unité-hôte, les tailles ralatives des accotement de la sève et la concentration de photosynthates pour choisir les milieux d'oviposition, dépendant d l'état de l'arbre-hôte. Sur les plantes non-fleurissantes, l'âge physiologique et les tailles relatives des accotement étaient les principaux déterminantes, tandis que sur les plantes fleurissantes tous les trois critères fussent utilisées bien que le facteur de concentration de sink-photosynthates a eu une influence dominante sur l'Orthezia plus qu'auteement.

Keywords

Orthezia insignisinfestation and feeding behaviourHamelia sphaerocarpahost-unitshost plantOrthezia insigniscompartement pur se nourrir et parasiterHamelia sphaerocarpal'unite-hotel'arbre hôte
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 7 , Issue 1 , February 1986 , pp. 61 - 67
Copyright
Copyright © ICIPE 1986

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