In Switzerland the most common rust disease of Italian and perennial ryegrass is crown rust (Puccinia coronata f.sp. lolii). The alternate host of P. coronata is common buckthorn (Rhamnus cathartica). Breeding for resistance to crown rust is a major component of our ryegrass improvement program. In order to assess the variation in pathogenicity of crown rust and the degree of host resistance to them, a range of Italian, hybrid and perennial ryegrass cultivars was tested for their reaction to Swiss crown rust collections. Among cultivars, significant differences in susceptibility were observed. Most Swiss cultivars showed a low infection level. For sixteen cultivars significant differences in infection level between rust collections occurred. Based on these results, three distinct groups of crown rust collections were identified. The host species, on which the urediospores were collected, had an important influence on the infection type of the different cultivars.
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.