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Population dynamics and parasitism of Coniesta (=Haimbachia) ignefusalis, Sesamia calamistis, and Heliocheilus albipunctella in millet monoculture

Published online by Cambridge University Press:  19 September 2011

Ousmane Youm  and
Frank E. Gilstrap
Ousmane Youm
Affiliation:
Department of Entomology, Texas A&M University College Station, Texas 77843-2475, USA
Frank E. Gilstrap
Affiliation:
Department of Entomology, Texas A&M University College Station, Texas 77843-2475, USA
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Abstract

Studies were conducted in Niger in 1986 and 1987 on the population dynamics and parasitism of the millet stem borer, Coniesta (= Haimbachia) ignefusalis (Hampson) (Lepidoptera:Pyralidae), Sesamia calamistis Hampson, and the millet head caterpillar, Heliocheilus albipunctella de Joannis (Lepidoptera: Noctuidae). Planting dates were assessed for effects on population densities of C. ignefusalis and H. albipunctella. Population densities of C. ignefusalis were not reduced by adjusting millet planting dates, but were affected by millet growth stage. Platytelenomus sp. (Hymenoptera: Scelionidae) was the most common parasite of C. ignefusalis on millet. Parasitism of C. ignefusalis larvae and pupae was rare. Sesamia calamistis was a minor pest of millet in Niger, and was rarely parasitized. Population densities of H. albipunctella were reduced by delaying millet planting dates. Bracon hebetor (Hymenoptera: Braconidae) was the most common parasite of H. albipunctella.

Résumé

Des études étaient menées en 1986 et 1987 sur la dynamique et le parasitisme du foreur des tiges du mil, Coniesta (= Haimbachia) ignefusalis (Hampson) (Lepidoptera: Pyralidae), de Sesamia calamistis Hampson, et de la mineuse de l'épi du mil, Heliocheilus albipunctella de Joannis (Lepidoptera: Noctuidae). L'influence des dates de semis sur les densités des populations du foreur des tiges du mil, et de la mineuse de l'épi de mil a été évaluée. Les densités des populations de C. ignefusalis n'étaient pas réduites par l'effet des changement des dates de semis, mais étaient affectées par le stade de développement du mil. Platytelenomus sp. (Hymenoptera: Scelionidae) était le plus fréquent parmi les parasites de C. ignefusalis sur le mil. Le parasitisme des larves et chrysalides de C. ignefusalis était rare. S. calamistis n'était pas un important nuisible du mil au Niger, et était rarement parasité. Les densités des populations de la mineuse de l'épi du mil étaient réduites en retardant les dates de semis du mil. Bracon hebetor Say (Hymenoptera: Braconidae) était le plus frequent parasite de la mineuse de l'épi du mil.

Keywords

Population dynamicsparasitismmilletstem borersConiesta (= Haimbachia) ignefusalisSesamia calamistisHeliocheilus albipunctellaWest AfricaNigerDynamiques des populationsparasitismemilforeurs de tigeConiesta (= Haimbachia) ignefusalisSesamia calamistisHeliocheilus albipunctellaAfrique de l'OuestNiger
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 14 , Issue 4 , August 1993 , pp. 419 - 426
Copyright
Copyright © ICIPE 1993

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References

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