We developed a lattice model to simulate the spatio-temporal interactions between beetles (Meligethes aeneus) and parasitoids (Tersilochus heterocerus) in relation with landscape composition and structure. The model describes the most important processes (dispersal, mortality and fecundity) affecting population structure in space and time. Parasitism rate was described by Thompson formalism. Landscape elements (semi-natural habitats, crops and grasslands) and agricultural processes (crop rotation, soil tillage, pesticides use) were explicitly considered in the model, considering their influence on beetle and parasitoid populations. Species-specific parameters were derived from the literature available on the species or its closed taxon. Landscape mosaic was defined on the basis of GIS maps collected in north-western France, figuring contrasting situations in terms of landscape complexity. The model was confronted to real population levels of beetle collected in the zone. A sensitivity analysis of the model allowed evaluating the importance of each species trait and landscape parameters in the explanation of population level. By linking species traits and landscape complexity, the model helps us understanding the ecological processes underlying landscape patterns. We discussed the potential of this model to use ecological services provided by landscape to select landscape managements that limit populations of beetles.