Yellow nutsedge (Cyperus esculentus L.) is among the most dreaded weeds worldwide. In Switzerland, it has increasingly become a problem for vegetable growers and arable farmers. This weed propagates and disperses via vegetative tubers in the soil. Producers are facing an important challenge: They have not only to stop the weed’s further dispersal but also reduce infestation levels in fields already broadly infested with yellow nutsedge. For the later a promising strategy is continuous cropping of maize combined with intensive weed control. Field trials were carried out in maize during 3 years (2011–2013). Aims were to determine the efficacy of different herbicides, split application, and mechanical control against yellow nutsedge. The results clearly showed that split application was superior to single application. S-metolachlor, bentazone, and rimsulfuron combined with mesotrione showed high efficacy. S-metolachlor combined with hoeing passes reduced infestation levels. A late under-leaf application additionally reduced yellow nutsedge. Cropping maize with the aim to reduce yellow nutsedge infestation levels requires a very intense weed control that will exceed current intensity levels considerably.
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.