Advertisement

A Thermal Unit Model for the Development of Acanthoplus Speiseri Brancsik (Orthoptera: Tettigoniidae: Hetrodinae)

  • K. J. Mbata
Research Article

Abstract

Acanthoplus speisen 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. speisen in Zambia, are discussed.

Key Words

Acanthoplus speiseri Brancsik armoured ground cricket degree-days Hetrodinae Orthoptera Tettigoniidae Thermal unit model 

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 modèle 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 modèle 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 development 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 contrôle future de A. speiseri en Zambie, sout considerées.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Hartley J. C. (1967) Laboratory culture of a tettigoniid. Homorocoryphus nitidulus vicinus (Walk.)(Orthoptera). Bull. Entomol, Res. 57, 203–205.CrossRefGoogle Scholar
  2. Mbata K. J. (1991a) Spatial dispersion patterns of the armoured ground cricket, Acanthoplus speiseri Brancsik at the University of Zambia Campus (Orthoptera:Tettigoniidae, Hetrodinae). Insect Sci. Applic. 12, 409–417.Google Scholar
  3. Mbata K. J. (1991b) Plant associations and rates of population interchange between food plant areas of Acanthoplus speiseri Brancsik (Orthoptera: Tettigoniidae, Hetrodinae). Insect Sci. Applic. 12, 401–408.Google Scholar
  4. Musonda E. M. (1990) Biology and control of the armoured cricket (Acanthoplus speiseri). Productive farming. Off. J. Zambia Commer. Farmers Bur. 195, 27, 29.Google Scholar
  5. Newman J. E, (1971) Measuring corn maturity with heat units. Crops and Soils Magazine. June–July, pp. 11–14.Google Scholar
  6. Rice R. E., Weakley C. V. and Jones R. A. (1984) Using degree-days to determine optimum spray timing for the Oriental fruit moth (Lepidoptera: Totricidae). J. econ. Entomol. 71, 698–700.CrossRefGoogle Scholar
  7. Ring D. R. and Harris M.K. (1983) Predicting pecan nut casebearer (Lepidoptera:Pyralidae) activity at College Station, Texas. Environ. Entomol. 12, 482–486.CrossRefGoogle Scholar
  8. Ring D. R., Calcote V. R., Cooper J. N., Olszak R., Begnaud J. E., Fuchs T. W., Neeb C. W., Parker R. D., Henson J. L., Jackman J. A., Flynn M. S. and Harris M. K. (1983) Generalization and application of a degree-day model predicting pecan nut casebearer (Lepidoptera: Pyralidae) activity. J. econ. Entomol. 76, 831–835.CrossRefGoogle Scholar

Copyright information

© ICIPE 1993

Authors and Affiliations

  • K. J. Mbata
    • 1
  1. 1.Department of Biological SciencesUniversity of ZambiaLusakaZambia

Personalised recommendations