Groupe de travail COLUMA Bourgogne Franche-Comté : analyse et cartographie de la résistance aux herbicides sur céréales

This working group made a survey and drew maps of herbicide resistances in cereal crops according to modes of action and weed species. These resistances concern mainly grass weeds but also one dicot weeds.

Membres du comité d’organisation scientifique et logistique

National audience

Résistance du vulpin aux herbicides. Son importance et sa répartition en Côte d'Or

BlACKGRASS lN WHEAT: A MAP OF HERBICIDE RESISTANCE Since the years 1990, the spread of herbicide resistance in wheatis more and more important within weed species as blackgrass (Alopecurus myosuroidesHuds,). Resistanceto the fenoxaprop-P-ethyl within blackgrass population wasfirst was detected in the Côte d'Or departement. ln this context, a map of the herbicide resistance of blackgrass was undertaken at the scale of this departement. 149 fields were used for this study with for each an agronomic investigation and harvests of blackgrass seeds. Almost the whole of the populations of blackgrass tested present at least 50% of plants resistant to fenoxaprop-P-ethyl, and 53% and 9% of these popu…

Membres du comité d’organisation scientifique et logistique

SPEEAGESTADAGROSUP; Membres du comité d’organisation scientifique et logistique. 23. Conférence du COLUMA - Journées Internationales sur la Lutte contre les Mauvaises Herbes

AFPP - 22nd COLUMA Conference - International Meeting on Weed Control

La nuisibilité directe des adventices en grandes cultures : quelles réponses nous apportent les essais désherbages ?

The direct harmful effect of weeds in field crops : what do herbicide trials tell us ? Weeds are plants whose undesirable qualities (“harmfulness") outweigh their desirable qualities (trophic resources). Few studies conclude that weeds do not affect crop yield. However, it is difficult to generalize since weeds compete with crops for resources and these resources are spatially and temporally variable. This study analyzed 110 herbicide trials (untreated vs. treated plots) performed in France from 1993 to 2015 on three major grain crops: winter wheat, winter oilseed rape and sunflower. Significant yield losses were found in 92% of wheat trials (average over all trials: -2.6 t/ha), 51% of wint…