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Mechanisms of Resistance to the Cassava Green Mite Mononychellus tanajoa (Bondar) on Pubescent and Non-Pubescent Cassava Varieties

  • Masamba Walangululu (a1), Ki Munseki Lema (a2) and Nlandu Nsumbu (a1)

Abstract

Cassava varieties resistant to the cassava green mite, Mononychellus tanajoa (Bondar) ( Acari:Tetranychidae) have been reported in many parts of Africa where the pest has been introduced. However, the resistance mechanisms have not been identified. Laboratory studies on biology and feeding behaviour of cassava green mite were carried out at the International Institute of Tropical Agriculture (IITA), in order to determine whether this resistance is mainly due to pubescence.

Cassava pubescence was found to have no antibiotic effect; both pubescent and non-pubescent varieties were preferred by the mite for oviposition, food and shelter. In addition, pubescence does not afford a mechanical barrier to cassava against green mite infestation.

Les variétés résistantes de manioc aux attaques d'acarien vert ont été observées dans beaucoup de pays d'Afrique où sévit cette peste mais les mécanismes de résistance n'ont pas encore été identifiés. Des études ont été menées au laboratoire à l'Institut International d'Agriculture Tropicale (IITA) sur la biologie et le comportement pendant la prise de nourriture de l'acarien vert en vue de confirmer si la pubescence est la cause principale de cette résistance, comme cela a souvent été affirmé à l'IITA.

Les résultats ont montré que les variétés pubescentes ne manifestent pas d'antibiose. Aussi bien les variétés pubescentes que non-pubescentes sont préférées pour la ponte, la nourriture et l'abri, indiquant qu'il n'y a pas de préférence pour l'une ou l'autre variété. En plus les poils n'empêchent pas l'acarien de se nourrir Sur les feuilles.

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Mechanisms of Resistance to the Cassava Green Mite Mononychellus tanajoa (Bondar) on Pubescent and Non-Pubescent Cassava Varieties

  • Masamba Walangululu (a1), Ki Munseki Lema (a2) and Nlandu Nsumbu (a1)

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