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Modeling the age-specific per capita growth and reproduction ofRhizobius lophanthae (Col: Coccinellidae)

Modèle âge-spécifique et par individu de croissance et reproduction de Rhizobius lophantae (Col.: Coccinellidae)

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Abstract

A per capita model for the growth, development and reproduction of the coccinellid predatorRhizobius lophanthae (Blaisd) feeding on the oleander scale(Aspidiotus nerii Bouche (Homoptera: Diaspididae)) was developed. A thermal threshold for development of 9.4°C was found. Under conditions of unlimited food, the relationship of mass at time t + 1 to that at t (in days at 25°C) suggests an 8.7 percent growth rate per mg larvae per day at 25°C. An adult female beetle produces approximately 20 eggs per day while consuming an average of 8.5 scales/day. This is approximately 2.16 eggs per scale consumed above the maintenance level of 1.88 scales per day. More precisely, this compensation point is 0.12 mg of prey/mg of predator/day at 25°C and the egestion rate is 1 - β = 0.63

Résumé

Un modèle par individu de la croissance, du développement et de la reproduction deRhizobius lophantae Biais., coccinelle prédatrice de la cochenille du laurier rose(Aspidiotus nerii Bouché) (Horn.: Diaspididae) a été élaboré. Un seuil théorique de développement thermique de 9,4°C a été déterminé. Dans des conditions de nourriture non limitantes, la relation de la masse au temps t + 1 à la masse au temps t (en jours à 25°C) se traduit par un taux de croissance de 8,7% par mg de larve/jour à 25°C. Une femelle adulte du prédateur produit approximativement 20 æufs/jour alors qu’elle consomme une moyenne de 8,5 cochenilles/jour. Ceci représente 2,16 æufs par cochenille consommée en plus du niveau d’entretien de 1,88 cochenilles par jour. Plus précisément, ce point de compensation est de 0,12 mg/ mg de proie/ jour à 25°C et le taux d’excrétion est de 1 - β = 0,63

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Authors and Affiliations

  1. FCAV-UNESP, Departmento de Entomol.ogia, Jaboticabal, SP, 14870-000, Brasil

    F. J. Cividanes (visiting scholar to UCB)

  2. Department of Environmental Science, Policy and Management, University of California, 94720, Berkeley, CA

    A. P. Gutierrez

Authors
  1. F. J. Cividanes
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  2. A. P. Gutierrez
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Cividanes, F.J., Gutierrez, A.P. Modeling the age-specific per capita growth and reproduction ofRhizobius lophanthae (Col: Coccinellidae). Entomophaga 41, 257–266 (1996). https://doi.org/10.1007/BF02764251

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