In Europe Septoria tritici (ST) is actually one of the most important diseases in wheat. The data from 12 Swiss field trials from 1993 to 1998 with different cultivars were analyzed. In 1/3 out of the cases a treatment against ST was economically justified. This situation is an ideal prerequisite to use intervention thresholds. From growth stage (GS) 32 to 65 we measured ST on the leaves F-4 to F (flag) with an ELISA kit. The antigen data were correlated with the visually assessed disease severities in GS 83. A strong relation to the disease state in GS 83 was measured with ST antigen data of the leaves F-3 at GS 39-45 and F-2 at GS 55-59. Using 1 (GS 39-45) and 5 (GS 55-59) antigen units as threshold values, in 85 and 93% of the 47 respectivelly 42 cases an economically right spray decision would have been taken.
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.