Herbicide resistance is a worldwide industrial agriculture problem that worsens from year to year. In certain northern European countries, black-grass is resistant to numerous different herbicides, and can scarcely be controlled in certain places. This phenomenon is also starting to emerge in Switzerland. Starting in 2011, and in order to monitor the appearance of new resistances and control their spread, Agroscope set up a monitoring programme at national level. This programme is important for the local development of prevention strategies in partnership with the cantonal plant-protection agencies. In Switzerland, the weed species currently affected by resistances are three monocotyledons (black-grass, loose silky bentgrass and Italian ryegrass) and a dicotyledon (lamb’s quarters). These have developed resistances to five different biochemical modes of action, defined at international level by the Herbicide Resistance Action Committee (HRAC). To prevent the appearance of new resistances and to best contain those that have already emerged, it is important to combine both cultural and phytosanitary control methods.
Herbicide-resistant weeds are a growing problem throughout the world. Monitoring herbicide resistance in Switzerland allows us to understand the mechanisms behind it and to better manage the use of herbicides.
Agroscope compared crop protection strategies in apple production. Reducing the use of plant-protection products lowered the local ecotoxological risks, but resulted in trade-offs between environmental and economic performance.
Bacillus thuringiensis (Bt) bacterium proteins protect Bt maize from being fed on by specific insects. A new, systematic analysis of international field data confirms that non-target organisms in Bt maize are largely spared.