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Beanfly Infestation on Common Beans (Phaseolus Vulgaris L.) in Kenya

  • J. H. Nderitu
  • H. Y. Kayumbo
  • J. M. Mueke
Research Article

Abstract

The population patterns of eggs, larvae and puparia in the bean plants and leaf punctures made by adults were investigated during cropping (March-July and October-January) and noncropping (July-October) seasons at two sites in Kenya. The beans planted in noncropping seasons had more leaf punctures, eggs, larvae and puparia than beans planted in cropping seasons. Beans planted in noncropping season attracted unusually high population from surrounding weeds as well as previous crop which cause severe damage. Under field conditions Ophiomyia spencerella Greathead and Ophiomyia phaseoli Tryon were the species of bean flies infesting the bean plants in all seasons. Both O. spencerella and O. phaseoli normally oviposited in punctures on the leaves but O. spencerella also oviposited in the stems of bean seedlings.

Key Words

Ophiomyia phaseoli Ophiomyia spencerella beanflies cropping seasons noncropping seasons leaf punctures eggs larvae pupae/puparia 

Résumé

Les echantillons des oeufs, larves et chrysallides sur les haricots et les perforations faites sur les feuilles par les adultes ont èté analysé pendant les deux saisons Mars-Juillet et Octobre-Janvier ainsi que pendant les mois de Juillet à Octobre dans deux locations au Kenya. Les haricots plantés entre Juillet et Octobre avaient plus des feuille perforées, beaucoup d’ouefs, larves et chrysallides par rapport aux haricots plantés pendant les autres saisons. Les haricots plantés entre Juillet et Octobre ont attiré beaucoup des mauvaises herbes et d’autres cultures qui peu vent causées des pertes enormes. Sur les champs Ophiomyia spencerella Greathead et O. phaseoli Tryon etaient les espèces d’insectes attacquant les haricots pendant toutes les saisons. Toutes les deux espèces pondaient normalement sur les feuilles perforées bien que O. spencerella puissent pondre sur les tiges des haricots en germination.

Mots Clefs

Ophiomyia phaseoli Ophiomyia spencerella saisons de cultures perforations sur les feuilles oeufs larves chrysallides 

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Copyright information

© ICIPE-ICIPE Science Press 1990

Authors and Affiliations

  • J. H. Nderitu
    • 1
  • H. Y. Kayumbo
    • 1
  • J. M. Mueke
    • 1
  1. 1.National Agricultural LaboratoriesNairobiKenya

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