HERBICIDES ET MULCH : les erreurs à ne pas faire pour gérer les ray-grass !

Martin Rollet, an agronomist at CNA and AgroLeague, shares his summary on the umbrella effect of herbicides, particularly in no-till (NTC) and conservation tillage. Thanks to Lionel Mesnage, Florent Franzetti, François Cochet, and the colleagues at AgroLeague for their review. 00:00 – Introduction: Adapting herbicide programs in conservation agriculture. 00:25 – Are weeds bio-indicators? (Case study: ryegrass and blackgrass). 02:13 – Fate of herbicides via surface mulch and the umbrella effect. 03:33 – How to quantify the umbrella effect (using the Canopeo application). 04:44 – Relationship between cover crop coverage and spray interception. 06:35 – Impact of cover crop termination method on herbicide interception. 08:28 – Measuring interception under straw residue. 09:32 – Adsorption and desorption: the role of KOC and organic matter. 11:05 – Synthesis by active ingredient: ability to detach from mulch (Luximo, Isoflex, etc.). 15:53 ​​– Accumulation of organic matter on the surface and loss of efficacy. 17:22 – Studies on the blockage of active ingredients according to age and organic matter content. 20:50 – Regulatory reminder on treatment conditions (rain). 21:05 – Trials on prosulfocarb: influence of mulch and rain on efficacy. 24:32 – Importance of rain timing after residue treatment. 26:37 – Focus on glyphosate: protecting the implement against resistance. 27:40 – Current status of blackgrass and ryegrass resistance in France. 30:22 – Techniques to improve efficacy: rolling before spraying. 31:30 – Comparison between generic and premium products. 32:38 – Managing water hardness and the role of ammonium sulfate. 33:50 – Influence of water volume and adjuvants. 35:42 – Risks associated with mixtures (glyphosate + 2,4-D) and the detoxification phenomenon. 37:54 – Phytotoxicity and root release of glyphosate near sowing. 41:32 – Factors influencing phytotoxicity (soil type, moisture, dose). 42:20 – Herbicide persistence and impact on cover crop establishment. 44:45 – Timeframes to respect for securing cover crops. 45:42 – Conclusion: Towards the end of 100% pesticide use and the importance of complex crop rotation. Published and distributed as part of the SOL Couvert project funded by the OFB / ECOPHYTO II+