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Thanks to the recent exceptionally warm and sunny days, meligèthes have sometimes made a sudden appearance in colza fields. With weather conditions expected to be favorable (or even very favorable) for the arrival of insects - meligèthes and weevils - we advise caution and regular monitoring for at least the next 15 days. Weakened plots (flea beetle larvae, wet soils in February, low biomass, etc.) are the most at risk.

Overall, the colza plots are now in the sensitive stage for meligèthes: stage D1, D2 for the most part, stage E for the earliest. The F1 stage could be reached before March 20-25 in the earliest situations.

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• Watch out for budworms
• Watch out for rapeseed stem weevil

Despite temperatures exceeding 20°C on Wednesday February 25, nothing to report in the Saint-Jean-d'Angély, Matha and Rouillac sectors.

A surprise on Thursday February 26 in the Saintes, Pons, Gémozac and Cozes sectors, with colza at D2 stage, and the number of budworms per plant above the damage threshold on the variety of interest in the presence of an early variety at E stage (most infested).

After these 3 days of fine weather, count the number of budworms on your colza to assess whether protection is necessary. Be even more vigilant in the case of rape crops handicapped by heavy infestations of flea beetle larvae and/or winter hydromorphy, and which are struggling to restart.