Risk assessment for large flea beetle larvae (winter flea beetle)

Risk assessment for large flea beetle larvae should begin in the second half of November and be repeated during the winter if conditions remain mild.

Dans quel département se situe votre exploitation ?
Le colza est-il dans un contexte favorable à sa croissance à l’automne ?
Le colza est-il bien enraciné ?
Les colzas commencent-ils à rougir ?
Population
Quel est le peuplement (nombre de plantes/m2) ?
Quel est la biomasse des colzas fin novembre ?
g/m2
Combien de larves de grosses altises observez-vous par plante ?
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Tool Description

Not much information to provide

The information required is: the county, soil type, pea history, and irrigation. There isn’t much to enter, but the details must be provided very precisely.


A tool usable in most regions

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


Points to Note

Currently, only the effect of winter or spring pea cultivation 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 due to a lack of data. Consequently, for fields that have been planted with one or more susceptible legumes other than peas as a main crop, intercrop, companion crop, or cover crop, the risk may be underestimated. Only a biological test can accurately estimate the risk in these fields.*
*Susceptible legumes: lentils, alfalfa, vetch, certain species/varieties of vetch (Access the test) »

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