BOLL , Roger

International audience

Background: The spread of agriculture greatly modified the selective pressures exerted by plants on phytophagous insects, by providing these insects with a high-level resource, structured in time and space. The life history, behavioural and physiological traits of some insect species may have evolved in response to these changes, allowing them...

International audience

Mite infestation is a big threat for rose greenhouses. It is much easier to halt and destroy them if their future development can be predicted. Taking into account temperature, humidity, cropping practices, plant vigour and some other influent parameters, an expert is able to predict the future development of the mites. Unfortunately, not all...

National audience

International audience

The ideal free distribution (IFD) is a stable distribution of competitors among resource patches. For equally efficient competitors, equilibrium is reached when the per capita rate of intake equalizes across patches. The seminal version of the IFD assumes omniscience, but populations may still converge toward the equilibrium provided that...

Most females of the Asian lady beetle, Harmonia axyridis Pallas (Coleoptera: Coccinellidae), stop laying eggs if conspecific larvae are present. We studied the effect of this inhibition on the dispersion of this insect in a greenhouse containing cucumbers uniformly infested with the aphid Aphis gossypii Glover (Homoptera: Aphididae). In the...

In crop systems, different types of plant or secondary crop may be grown together with the primary crop for pest management purposes. These additional plants - henceforth called secondary plants - may increase the efficiency and sustainability of biological control of pests by natural enemies. Such plants fall into several categories:...

Protected cultivation or Controlled Environment Agriculture (CEA) system has increased tenfold in the last 25 years thanks to tremendous scientific and technical breakthroughs, mainly directed to increasing crop yields and adapting to tough ambient conditions. Currently, greenhouse areas are still spreading and the CEA system is one of the...

International audience

Conventional crop protection is reaching its limits through the inefficacy of the products and the unintended impacts on the environment. Integrated protection, using in particular auxiliaries, nevertheless depends on the development of reliable methods for estimating population densities of pests and auxiliaries. From a tool already partially...

International audience

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Effective management of tomato pests such as Bemisia tabaci and Tuta absoluta requires the integration of more sustainable control methods. Applying integrated pest management (IPM) approaches using combinations of biocontrol agents with agronomic practices such as the modulation of fertilisation offers opportunities toward more efficient pest...

Les pouvoirs publics souhaitent favoriser l'adoption de systèmes de culture économes en pesticides, en mettant en place un réseau d'acquisition de références expérimentales et de démonstration, associé à un système d'information. Pour répondre à cette demande, le groupe "Réseau" a fait un état des lieux, proposé une configuration, et évalué les...