Increasing soil suppressiveness

In this project the impact of different crops and organic materials on soil suppressiveness of Rhizoctonia solani AG2 in sugar beet and cabbage will be assessed. Next to that, the suppressiveness will be compared with the presence of antagonistic Lysobacter species.

The research will assess the effect of several agricultural practices on mycorrhiza colonization of onion roots in relation to Fusarium control in onion as well.


Soil borne diseases can cause important economic losses in agricultural crops. These diseases are often difficult to control; chemical pesticides are not always available or sufficiently effective. Moreover, healthy natural soils have the potential to limit disease development. Soils can be disease suppressive: i.e. the presence of the pathogen does not lead to disease development.

In this project, management of soil suppressiveness towards two economocally important soil-borne diseases will be studied:

  • Rhizoctonia solani AG2 in sugar beet and cabbage,
  • Fusarium oxysporum in onion.


  • Data from field and greenhouse experiments
  • Publication (Dutch) on Rhizoctonia suppression and organic materials
  • Publication (Dutch) on effect of agricultural practices on mycorrhiza colonization in relation to Fusarium in onion
  • Scientific publication on Lysobacter populations in relation to Rhizoctonia suppression
  • Correlation betweem agricultural practices and data of Fusarium disease in onion – mycorrhiza-colonisation – Lysobacter population -  and soilsuppressiveness against Rhizoctonia.