Dhr.ir. G. (Gerbert) A. Hiddink: “Suppression of soilborne pathogens in mixed cropping systems”

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7 Nov 2008 13:30
Unit: Wageningen University
Location: Aula, building 362, Gen. Foulkesweg 1, Wageningen
Organisation: Wageningen Universiteit
Promotor: prof.dr.ir. A.H.C. Van Bruggen (Biological Farming Systems)
Co Promotor: Dr. ir. A.J. Termorshuizen (BLGG), Dr. J.M. Raaijmakers

 Take-all disease in triticale (caused by the fungus Gaeumannomyces graminis) was more suppressed in organically than in conventionally managed soils. This suppression was of aspecific nature. However, also establishment and effectivity Pseudomonas fluorescens (an antagonist of Take-all) was lower in the organically managed soils.

A literature review on effects of mixed cropping on soilborne pathogens revealed that in the majority of cases disease suppression occurs in mixed cropping. The effect of mixed cropping on disease suppression was studied in various greenhouse and field experiments. Triticale-white clover reduced Take-all relative to single cropping of triticale. Disease suppression was not present in the bulk soil for two mixed cropping systems (barley-Brussels sprouts and triticale-clover). We conclude that disease suppression in mixed crops is driven by rhizosphere processes and hence is a plant driven process. We hypothesize that root architecture has a decisive influence on the interactions taking place in mixed cropping systems.

Title thesis: “Suppression of soilborne pathogens in mixed cropping systems”
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