Replant diseases in fruit production affect tree growth and reduce yields when orchards are replanted. In 2008, a survey conducted by Agroscope ACW revealed an increase in replant problems in Swiss apple orchards. Investigations on two apple orchards where trees had been planted in altered row distance, have shown significantly better growth and higher yield for trees on the old grass lane compared to those on the old tree row. Apple seedlings grown in the soil from replanted tree rows showed significantly better growth when the soil was sterilized, demonstrating the biotic nature of the poor tree growth in these orchards. In 2009, two field trials were started at ACW to investigate the usefulness of pre-plant soil treatments and different rootstock genotypes in controlling apple replant problems. Collaboration with other research institutes has been initiated for the investigation of the complex etiology of apple replant problems.
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.