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A Thermal unit model for the development of Acanthoplus Speiseri Brancsik (Orthoptera: Tettigoniidae: Hetrodinae)

Published online by Cambridge University Press:  19 September 2011

K. J. Mbata
K. J. Mbata
Affiliation:
Department of Biological Sciences University of Zambia, P.O. Box 32379 Lusaka, Zambia
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Abstract

Acanthoplus speiseri Brancsik, a pest of grain crops in Zambia, was reared in the laboratory at different temperatures. Mean development times of the eggs, nymphs and adults were determined at the different temperatures and used to develop a thermal unit model for use by farmers to predict the appearance dates of the different nymphal instars and the adults in the field in a given season. The predictions generated by the developed model for the 1990/1991 season, were compared to the actual dates on which the first specimen of each developmental stage was collected in the field during the season. The predicted dates of appearance all fell within 1 week of the observed dates of collection. Reasons for the slight deviations between the predicted and observed dates and the significance of the developed thermal unit model to the future control of A. speiseri in Zambia, are discussed.

Résumé

Acanthoplus speiseri Brancsik, un insecte nuisible aux plantes productrises de grains en Zambie, était éleve dans le laboratoire sous des temperatures differentes. La durée moyenne de development des oeufs, des nymphes et des adultes était détermine pour chaque temperature et était employé pour trouver un modéle de system thermal qui peut être utilisé par les fermiers pour predire les dates d'apparition des stages différentes des nymphes et des adultes dans le champs durant une saison specifique. Les prédictions faites à partir du modéle lorsque celui-ci était appliqué à la saison 1990/1991, étaient comparée avec les dates actuelles de la saison durant losquelle les premiers specimens de chaque stage de dévelopment étaient ramassés dans le champs. Toutes les dates prédites d'apparition tombérent dans les limites d'une semaine au-delà des dates actuelles de collection. Les raisons probablés pour expliquer la petite différence entre les dates prédites et les dates actuelles de collection et l'importance du modéle trouvé dans le controie future de A. speiseri en Zambie, sout considerées.

Keywords

Acanthoplus speiseri Brancsikarmoured ground cricketdegree-daysHetrodinaeOrthopteraTettigoniidaeThermal unit model
Type
Research Artilces
Information
International Journal of Tropical Insect Science , Volume 14 , Issue 3 , June 1993 , pp. 355 - 360
Copyright
Copyright © ICIPE 1993

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References

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