In a 2-year investigation, harvest samples from Swiss growers’ wheat fields were examined for Fusarium species incidence and data on cultivation techniques were collected. In addition, the content of the mycotoxin deoxynivalenol (DON) was analysed in three quarters of the samples. From a total of 248 samples originating from 16 cantons, three Fusarium species were dominant: F. graminearum, followed by F. poae and F. avenaceum. The average DON content, produced mainly by F. graminearum, was 1.0 ppm and thus barely below the maximum limit for unprocessed cereals (1.25 ppm). However, with the pre-crop maize and reduced or zero tillage, the average DON content was 3.2 ppm. The Fusarium incidence and the DON content differed between the two years, which could be explained by the prevailing weather conditions during and after wheat anthesis. The incidence of F. poae and F. avenaceum suggests that some wheat batches could contain the toxins nivalenol or moniliformin. By collecting data on cultivation techniques on a long-term basis, we aim to elucidate factors that influence infection by the most prevalent Fusarium species on wheat. This should allow us to develop means to reduce the risk of mycotoxin contamination.
Stucky T., Hochstrasser M., Meyer S., Segessemann T., Ruthes A. C., Ahrens C. H., Dahlin P., Pelludat C.
The root knot nematode (RKN) Meloidogyne incognita causes damage in field and greenhouse crops. Agroscope researchers have developed a new screening test to identify bacteria that antagonise this agricultural pest.
With CULTAN fertilisation, nitrogen is injected into the soil as an ammonium solution. Multi-year trials conducted by Agroscope show that this method reduces nitrogen leaching by an average 38% without negatively affecting yields.
Tuta absoluta is one of the most destructive pests of solanaceous crops. Agroscope has developed a statistical model to study the population dynamics of the pest and its parasitoids and allows interventions to be optimally planned.