An age-mass structured multi-year tritrophic simulation model of the coffee (Coffea arabica var. mundo novo) - coffee berry borer [Hypothenemus hampei (Ferrari)], borer - three parasitoid system was developed. Three years of extensive plant drymatter data and one year of field data on borer dynamics were collected at Londrina, PR, Brazil. The allometric relationships and parameter for plant drymatter allocation were estimated from the field data, but the parameters for borer and its three parasitoids were summarized from the literature. Initial levels of soil factors (e.g., nitrogen and water) and observed weather data were used to drive the model. The model is largely independent of the field data, yet it simulated the dynamics of plant branching, fruiting and drymatter growth of plant subunits. Simulation results suggest that of the three parasitoids commonly introduced to control the borer, only the eulophid adult endo-parasitoid (Phymastichus coffea La Salle) has the demographic characteristics to potentially regulate borer populations. The effects of harvesting, cleanup of abscised berries, inundative releases of parasitoids and pesticides with various toxicity and persistence characteristics on borer dynamics were evaluated. The model is very flexible, and may provide a sound foundation for incorporating new findings, new varieties, and the biology of new natural enemies worldwide

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Can. Ent. 119: 109-129 (1987) A distributed delay age structure model is presented for plants and insects that describes the dynamics of per capita energy (dry matter) acquisition and allocation patterns, and the within-organism subunit (e.g. leaves, fruit, ova) number dynamics that occur during growth, reproduction, and development. Four species of plants (common bean, cassava, cotton, and tomato) and two species of insects (pea aphid and a ladybird beetle) are modeled. A common acquisition (i.e. functional response) submodel is used to estimate the daily photosynthetic rates in plants and consumption rates in pea aphid and the ladybird beetle. The focus of this work is to capture the essence of the common attributes between trophic levels across this wide range of taxa. The models are compared with field or laboratory data. A hypothesis is proposed for the observed patterns of reproduction in pea aphid and in a ladybird beetle. RCsumeOn a construit un modele dkmographique avec distribution de dklai applicable ? I des plantes et des insectes. Le modele dkcrit la dynarnique de l'appropriation et de la rkpartition de I'knergie (matiere seche) per capita, et la dynamique des nombres des sous-unites inm-organisme (ex. feuilles, fruits, oeufs). On a ainsi modklist quatre sortes de plantes {Eve, cassava, coton et tomate) et deux espkes d'insectes (puceron du pois et coccinelle). On utilise un sous-modcle comrnun d'acquisition (rdsponse fonctionnelle) pour estimer les vitesses journali&res de photosynthkse des plantes et d'alimentation du puceron et de la coccinelle. Le but de ce travail est d'extraire les caractkristiques essentielles communes aux niveaux trophiques occup6s par ces divers taxons. Les modkles sont compares avec des donnkes de terrain et de laboratoire. On propose une hypothese pour expliquer les profils obsew6s de reproduction du puceron du pois et de la coccinelle.