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Seasonal abundance and life history of the millet stem borer, Coniesta ignefusalis Hampson (Lepidoptera: Pyralidae) in Samaru, Nigeria

Published online by Cambridge University Press:  19 September 2011

A. A. Adesiyun
A. A. Adesiyun
Affiliation:
Department of Crop ProductionUniversity of Ilorin, Ilorin, Nigeria
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Abstract

A light trap was operated in Samaru, Nigeria between 1973 and 1980 to monitor populations of Coniesta ignefusalis. Two generations of the insect/year were represented by two adult peaks in July and September. In 1974, an early peak in May resulted in three generations. In cages in the field, eggs were laid between the leaf sheath and the stem in batches of 20 to 70 with a mean of 47.5 eggs/batch. Laboratory studies conducted at 25–28°C and 75–85% r.h. showed an average developmental period of 35.5 days. The average duration of the egg, larval and pupal stages were 4.5, 21.9 and 9.2 days, respectively. Unfed adults lived for 5.3 days.

Résumé

On a réalisé une petite opération à Samaru au Nigeria entre 1973 et 1980 afin de verifier la croissance de C. ignefusalis. Deux générations de l'insecte/par an étaient représentées par deux adultes arrivées à maturité en juillet et septembre. En 1974, l'adulte précoce du mois de mai a mené à trois generations. Dans les cages posées dans le champs, les oeufs étaient pendus entre la gaine et la tige en un paquet de 20 à 70 oeufs avec la moyenne de 47.5 oeufs dans un paquet. Les études faites au laboratoire à 25–28°C et à 75–85 % (humidité relative) ont montré que la période du développement était 35.5 jours. La durée moyenne des oeufs (étapes larvaires et de pupe) était 4.5, 21.9 et 9.1 jours respectivement. Les adultes privées de nourriture ont vécu pendant 5.3 jours.

Keywords

Coniesta ignefusalislife historypearl milletPennisetum glaucumstem borer
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 14 , Issue 5-6 , December 1993 , pp. 589 - 593
Copyright
Copyright © ICIPE 1993

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References

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