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Diurnal population trends of Megalurothrips sjostedti and Frankliniella occidentalis (Thysanoptera: Thripidae) and their natural enemies on French bean Phaseolus vulgaris (Fabaceae)

  • J. Kasina
  • J. NderituEmail author
  • G. Nyamasyo
  • F. Olubayo
  • C. Waturu
  • E. Obudho
  • D. Yobera
Article

Abstract

A field experiment was conducted to track the daily population trends and occurrence of the flower thrips Megalurothrips sjostedti Trybom and Frankliniella occidentalis (Pergande), and their indigenous natural enemies Orius spp. and Ceranisus menes (Walker), infesting French beans. French beans in monocrop or interplanted with six companion crops (Zea mays L., Coriandrum sativum L., Tagetes erecta L., Brassica oleracea var. acephala L., Daucus carota L. and Capsicum annuum L.), and two chemical insecticides, methiocarb (Mesurol 500SC) and L-cyhalothrin (Karate 1.75% EC), were evaluated for their effects on the abundance of flower thrips, throughout the day, at 1-h intervals. The average population peak of thrips was found to occur at around 1300 h, but each species had different peak periods. Adult F. occidentalis populations peaked at midday and adult M. sjostedti populations at 1500 h, while the larvae of the two thrips species peaked at around 1300 h. Orius spp. were the most abundant natural enemies and their populations peaked at around 1400 h. Ceranisus menes population also peaked at around 1400 h.

Key words

companion crop Ceranisus menes Frankliniella occidentalis Megalurothrips sjostedti Orius spp Phaseolus vulgaris population trend diurnal activity 

Résumé

Une expérimentation de terrain a été conduite afin de déterminer la dynamique des populations des trips de fleurs Megalurothrips sjostedti Trybom et Frankliniella occidentalis (Pergande), et de leurs ennemis naturels indigènes Orius spp. et Ceranisus menes (Walker) sur haricot vert au cours de la journée. L’abondance des trips a été évaluée sur des haricots verts cultivés en monoculture ou en culture associée avec six autres plantes (Zea mays L., Coriandrum sativum L., Tagetes erecta L., Brassica oleracea var. acephala L., Daucus carota L. et Capsicum annuum L.) et avec deux insecicides methiocarb (Mesurol 500SC) et L-cyhalothrin (Karate 1.75% EC), pendant toute la journée, à 1 heure d’intervalle. Le pic d’infestation des trips a été observé vers 1300 h, avec toutefois une période différente pour chaque espèce. Le pic de population des adultes de F. occidentalis est observé à la mie journée et celui de M. sjostedti à 1500 h, alors que le pic de populations des larves des deux espèces est observé à 1300 h. Les espèces du genre Orius sont les ennemis naturels les plus abondants avec un pic de population vers 1400 h. La population de Ceranisus menes est maximum vers 1400 h.

Mots Clés

culture associée Ceranisus menes Frankliniella occidentalis Megalurothrips sjostedti Orius spp Phaseolus vulgaris dynamique des populations activité diurne 

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References

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Copyright information

© ICIPE 2006

Authors and Affiliations

  • J. Kasina
    • 1
  • J. Nderitu
    • 1
    Email author
  • G. Nyamasyo
    • 2
  • F. Olubayo
    • 1
  • C. Waturu
    • 3
  • E. Obudho
    • 1
  • D. Yobera
    • 1
  1. 1.Department of Plant Science and Crop ProtectionUniversity of NairobiNairobiKenya
  2. 2.Department of ZoologyUniversity of NairobiNairobiKenya
  3. 3.Kenya Agricultural Research InstituteNational Fibre Research CentreKerugoyaKenya

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