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

  • Markus KnappEmail author
  • Debora Apiyo Mugada
  • Stephen Gaya Agong
Research Article

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.

Key Words

Lycopersicon esculentum resistance Tetranychus urticae tomato twospotted spider mite 

Résumé

La rèsistance de 63 variétés de tomate (Lycopersicon esculentum Mill.) à l’acarien vert Tetranychus urticae Koch (Acari: Tetranychidae) a été étudiée en conditions de serre et comparée à une variété 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 variétés (Marglobe, Roma-VF, 94 RT 330, Continental Michel, Early Pearson, ARP 366-4 et 94 RT 316) que sur la variété témoin (Money Maker). Le nombre d’oeuf a été également significativement plus faible sur 14 variétés (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 variété sensible témoin (Money Maker). Cette étude révèle l’èxistence d’une rèsistance à T. urticae chez certaines variètès de tomate.

Mots Clés

Lycopersicon esculentum résistance Tetranychus urticae tomate acarien vert 

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Copyright information

© ICIPE 2003

Authors and Affiliations

  • Markus Knapp
    • 1
    Email author
  • Debora Apiyo Mugada
    • 2
  • Stephen Gaya Agong
    • 2
  1. 1.International Centre of Insect Physiology and Ecology (ICIPE)NairobiKenya
  2. 2.Jomo Kenyatta University of Agriculture and Technology (JKUAT)NairobiKenya

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