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Biotaxonomy of cassava green spider mites, Mononychellus spp. (Tetranychidae): “Life type” as a possible biological criterion for their identification

  • G. W. Oloo (a1), C. K. P. O. Ogol (a1) and K. O. Kambona (a1)

Abstract

The life patterns of cassava green spider mite populations were compared using characteristics of spinning behaviour and other associated biological parameters so as to determine the possibility of using these criteria for separating closely related forms or populations of Mononychellus complex of species. These included web structure and density, preferred site for oviposition, feeding, walking, defecation, quiescence, spinning behaviour during walking and type of egg cover. Of these, preferred site for feeding, walking, quiescence and spinning behaviour during walking were found to be consistent and could possibly be used in comparative studies on different mite populations. The surface structure of the leaves i.e. pubescence, and mite population density were found to affect some of the behaviour patterns. Detailed studies on the influence of other factors, such as host plant variety, stage of plant growth, age of leaf colonized, weather, etc. will be necessary to determine the usefulness of these biological criteria in separating sympatric and allopatric populations of the mite.

Les modes de vie des populations du complexe Mononychellus, gales du manioc ont été comparés. Les critères caractéristiques du comportement du tissage et d'autres parametres biologiques, associes sont utilisés pour tenter de séparer par ces critères des formes ou des populations proches du complexe Mononychellus. La structure et la densité de la toile sont analysées, de même l'endroit préféré pour déposer les oeufs sont comparées, ainsi que le régime alimentaire, la manière de se déplacer, la défécation, la quiescence, la façon de tisser en marchant. On peut propablement utiliser ces paramètres pour les études comparatives des différentes populations des gales. Par exemple on a trouvé que la structure de la surface des feuilles “pubescence” et la densité des populations des gales affectent certains modes de comportement. Des études détaillées de l'influence d'autres facteurs tels la variété de la plante hôte, le stade de développement de la plante, l'âge de la feuille colonisée, le temps etc. seront nécessaires. Ces critères biologiques pour séparer les populations de gales sympatriques et allopatriques pourrant alors être utilisés.

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Biotaxonomy of cassava green spider mites, Mononychellus spp. (Tetranychidae): “Life type” as a possible biological criterion for their identification

  • G. W. Oloo (a1), C. K. P. O. Ogol (a1) and K. O. Kambona (a1)

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