Bacterial blight is a foliar disease caused by Pseudomonas savastanoi pv. glycinea. The disease is characterised by angular leaf spots yet with only little impact on the yield. The seeds constitute the primary source of inoculum, and contaminated seeds may affect the diffusion of new varieties. The best approach to preventing the disease is to use resistant varieties. The aim of this study was to develop a resistance test for the greenhouse to determine the resistance of soybean lines to bacterial blight. The test included seven bacterial strains with distinct and specific avirulence genes tested on 91 soybean genotypes. The results exhibit a wide spectrum of interactions. Whilst all genotypes were resistant to part of the bacteria, only four varieties were resistant to all bacterial strains. This test will be used to screen the diversity of avirulence genes present in the populations of Pseudomonas savastanoi pv. glycinea in order to determine which resistance genes are most useful for preventing bacterial blight and the transmission of the seed-borne pathogen.
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.