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Population dynamics, host plant damage and parasitism associated with the African rice gall midge in southern Burkina Faso

Published online by Cambridge University Press:  19 September 2011

Souleymane Nacro ,
D. Dakouo  and
E. A. Heinrichs
Souleymane Nacro
Affiliation:
Institut d'Etudes et de Recherches Agricoles, Station de Farako-Ba, BP 910, Bobo Dioulasso, Burkina Faso
D. Dakouo
Affiliation:
Institut d'Etudes et de Recherches Agricoles, Station de Farako-Ba, BP 910, Bobo Dioulasso, Burkina Faso
E. A. Heinrichs*
Affiliation:
West Africa Rice Development Association (WARDA), 01 B.P. 2551 Bouaké, Côte d'Ivoire
*
Corresponding author: EAH, Department of Entomology, University of Nebraska, 202 Plant Industry-East Campus, Lincoln, NE 68583-0816, USA.
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Abstract

Populations of larvae and pupae of the African rice gall midge, Orseolia oryzivora Harris & Gagne (Diptera: Cecidomyiidae), and two parasitoids, Platygaster diplosisae Risbec and Aprostocetus procerae (Risbec)[= Tetrastichus pachy diplosisae Risbec], were recorded in replicated experiments on farmers' fields at Karfiguéla, Burkina Faso in the 1992 wet season and the 1993 dry season. In each season, four plantings were made at 14-day intervals and samples taken at weekly intervals for 10 weeks. Gall midge populations in the wet season developed through three distinct phases: an initial slow increase, followed by a period of rapid increase coinciding with maximum tillering, and then a final decline. On average, the highest midge populations and highest levels of parasitism developed in the later plantings. During the dry season midge infestations were low and no parasites were detected.

Résumé

Les populations de la larve et de la pupe d'Orseolia oryzivora Harris & Gagne (Diptera: Cecidomyiidae) et de deux parasitoïdes, Platygaster diplosisae Risbec et Aprostocerus procerae (Risbec) [= Tetrastichus pachydiplosisae Risbec], ont été enregistrées en essais au champ de paysans à Karfiguéla, Burkina Faso durant a saison humide de 1992 et a saison sèche de 1993. Dans chaque saison, quatre semis ont été fait à intervais de 14 jours et les enchantillons pris à intervais hebdomadaire pendant 10 semaines. Les populations d'O. oryzivora pendant la saison humide se développent en 3 phases distinctes: une phase de croissance lente correspondant à la spériode de migration de l'insecte de ses plantes-hôtes sauvages vers les rizières; une phase de croissance rapide survenant vers la fin du tallage du riz et enfin une phase de croissance caractérisée par la maturation du riz et donc la rareté de jeunes plantes. En moyenne, les semis plus tardifs étaient les plus infestés par l'insecte. Pendant la saison sèche les populations d'O. oryzivora sont basses et on ne trouve pas de parasitöides.

Keywords

riceOryza sativarice gall midgeinsect populationsparasitismparasitoidsPlatygaster diplosisaeAprostocetus proceraeBurkina FasoW. AfricarizOryza sativaCécidomyie du rizdynamique des populationsparasitismeparasitöidesPlatygaster diplosisaeAprostocetus proceraeBurkina FasoAfrique de l'Ouest
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 16 , Issue 3-4 , December 1995 , pp. 251 - 257
Copyright
Copyright © ICIPE 1995

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