Terminal bud weevil risk estimate

Terres Inovia's "Terminal bud weevil" risk assessment tool can be used to evaluate the risk associated with terminal bud weevil, at plot level.

Location of the rapeseed plot
Favorable context for autumn growth
Good rooting of rapeseed
Reddening of rapeseed
Population
Number of plants/m²
Mid-October rapeseed biomass
Grams/m²
Trapping weevils in basins
Frequency of damage in the absence of treatment
Strong Intermediate Weak
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Tool description

Little information required

The information to be provided includes: department, soil type, history of peas and irrigation. These are few in number, but must be filled in very precisely.


A tool that can be used in most regions

The EvA tool was developed from a database containing information on 780 plots in the northern half of France, then validated on 120 plots, mainly in the Normandy and Centre-Val de Loire regions. This tool can be used in the Bourgogne-Franche-Comté, Bretagne, Centre-Val de Loire, Grand Est, Hauts-de-France, Île-de-France, Normandie, Nouvelle-Aquitaine and Pays de la Loire regions.


Points of attention

At present, only the effect of a winter or spring pea crop on the evolution of a soil's Infectious Potential is known. The effect of other susceptible legumes has not yet been taken into account in this tool, for lack of data. Consequently, for plots that have received one or more susceptible legumes other than pea as a main, intermediate, associated or companion crop, the risk may be underestimated. Only the bioassay can be used to estimate the risk in these plots*.
*Susceptible legumes: lentil, alfalfa, chickling vetch, certain species/varieties of vetch (Access the test) "

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