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Screening Tomato (Lycopersicon esculentum Mill.) Accessions for Resistance to the Twospotted Spider Mite Tetranychus urticae Koch: Population Growth Studies

  • Markus Knapp (a1), Debora Apiyo Mugada (a2) and Stephen Gaya Agong (a2)
Abstract

The resistance of 63 tomato (Lycopersicon esculentum Mill.) accessions to the twospotted spider mite Tetranychus urticae Koch (Acari: Tetranychidae), was investigated in screen house experiments and compared to Money Maker, a T. urticae-susceptible variety widely grown in Kenya. The number of motile mite stages 12 days after inoculation with 5 adult female mites was significantly lower than in the control variety (Money Maker) in seven accessions (Marglobe, Roma-VF, 94 RT 330, Continental Michel, Early Pearson, ARP 366–4 and 94 RT 316). Egg numbers were significantly lower than in the control in 14 accessions (Marglobe, Cal-J-VF, Roma-VF, Beauty, 95 RT 315, 93 KT 20, EC.3504,94 RT 313, EC-1193, Continental Michel, Early Pearson, ARP 366–4,94 RT 316 and Malawi Local 3). This study reveals the existence of resistance to T. urticae in the tomato accessions.

La rèsistance de 63 variètès de tomate (Lycopersicon esculentum Mill.) à l'acarien vert Tetranychus urticae Koch (Acari: Tetranychidae) a ètè étudièe en conditions de serre et comparèe à une variètè sensible à T. urticae appelée “Money Maker”, largement cultivée au Kenya. Le nombre d'acariens vivants, 12 jours après infestation par 5 femelles adultes, a été significativement plus faible sur sept variètès (Marglobe, Roma-VF, 94 RT 330, Continental Michel, Early Pearson, ARP 366–4 et 94 RT 316) que sur la variètè témoin (Money Maker). Le nombre d'oeuf a ètè également significativement plus faible sur 14 variètès (Marglobe, Cal-J-VF, Roma-VF, Beauty, 95 RT 315,93 KT 20, EC.3504,94 RT 313, EC-1193, Continental Michel, Early Pearson, ARP 366–4,94 RT 316 et Malawi Local 3) que sur la variètè sensible témoin (Money Maker). Cette ètude rèvèle l'existence d'une résistance à T. urticae chez certaines variètès de tomate.

Copyright
COPYRIGHT: © ICIPE 2003
References
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International Journal of Tropical Insect Science
  • ISSN: 1742-7584
  • EISSN: 1742-7592
  • URL: /core/journals/international-journal-of-tropical-insect-science
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