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Last update: May 2021

Menu Logo Principal MicMac-Design Partners

MicMac Design Project

MicMac-Design Project

Sub-task 4.2.1: Modelling of injuries and linkage with crop models

The design of innovative cropping systems requires a representation of cultural practices on pest population dynamics and the associated injuries.

With regards to the complexity of the considered systems, modelling plays a key role in the design of Integrated Pest Management (ICM) strategies.

Because pests encountered in arable crops encompass a huge number of species, it is necessary to follow a functional approach of biotic stresses.

First of all, the ecological concepts of functional traits will be used to help building a typology of insects and diseases. This typology, which will be performed in the context of a thesis associated to the MicMac-Design project, will concern the major pests of oil seed rape, sunflower, maize, sugar beet, lucerne, pea, wheat and grape.

For each of the identified functional types, a model will be developed to simulate pest development in relation with weather factors, microclimatic conditions (temperature in the canopy, air humidity), host plant status (described according to its phenological development, its available surface to support pest, its trophic supply for pest) and soil physical status, under the influence of cultural practices.

The modelling formalism carried out will rely on existing generic epidemiological models. The calibration for selected host-pest models will be performed using published data. Those models will then be linked with crop growth and plant development modules, thanks to the RECORD platform(see Work-package 6). This linkage will allow the use of crop modules outputs (microclimate variables into the canopy, plant age and structure, or plant nutrient contents) as inputs for the pest models.

In this sub-task, it is the model STICS that will be used for the crop model, except for a specific disease on durum wheat (Septoria leaf blotch) for which a 3-dimensional model will be used in order to handle a diversity of modelling formalisms to ensure the genericity of the MicMac platform (Work-package 6).

Because of the timeframe and the complexity of the purpose, this sub-task will not address yield loss modelling and should therefore only be seen as a methodological contribution to the design of cropping systems.

The involved partners in this task are AGIR unit (INRA Toulouse), Agroclim unit (INRA Avignon) and ARVALIS.