Biofumigation with Brassica plants and its effect on the inoculum potential of Fusarium yellows of Brassica crops

Abstract

The use of Brassica crops as green manure in the so-called biofumigation treatment has been successfully exploited for the management of soilborne pathogens and is gaining interest particularly in the case of less intensive agricultural systems. A study was undertaken to investigate possible negative sideeffects of biofumigation in order to prevent possible damage caused by wilt pathogens able to attack both plants used for biofumigation as well as agricultural crops. To do so, firstly the response of different Brassicas, including some used in biofumigation, to the formae speciales of Fusarium oxysporum known for being pathogenic on Brassica crops was evaluated.

Effect of Fodder Radish (Raphanus sativus L.) Green Manure on Potato Wilt, Growth and Yield Parameters

“…Other studies indicate that the negative effect of these amendments may result from increased pathogens' inoculum potential when the substrate serves to sustain saprophytic growth of plant pathogens [35] or from the increase of inoculum potential of pathogens carried out by the Brassica-based amendments themselves [34].…”

“…However, some studies indicate that the effectiveness of organic amendments including Brassica residues is variable and, in some cases, can even enhance disease severity [34]. This negative effect of organic amendments may be attributed to increased pathogen inoculums' potential, as the decaying material may serve to sustain saprophytic growth of plant pathogens [35], or carried out by the Brassica amendments themselves [34].…”

“…This negative effect of organic amendments may be attributed to increased pathogen inoculums' potential, as the decaying material may serve to sustain saprophytic growth of plant pathogens [35], or carried out by the Brassica amendments themselves [34]. Furthermore, increases in tuber yield using green manures crops have been inconsistent, despite the beneficial disease suppressive effects [36][37][38].…”

Effect of different organic amendments on lettuce fusarium wilt and on selected soilborne microorganisms

“…By monitoring the population densities of soil microorganisms and pathogens in soil, it is possible to obtain a better understanding of the complex effect of organic amendments or crop residues on soil microorganisms, including pathogens (Njoroge et al, 2008;Lu et al, 2010;Ferrocino et al, 2014;Ascencion et al, 2015). Several parameters have been explored in attempts to describe the suppressive properties of soil (Janvier et al, 2007).…”

Control of Colletotrichum coccodes on Tomato by Grafting and Soil Amendments

“…Biofumigation can be achieved by incorporating fresh plant material (green manure), seed meals, dried plant material or using brassica intercrops. However, some studies indicate that the effectiveness of organic amendments including brassica residues is variable and, in some cases, can enhance severity of some diseases (Mazzola et al 2007;Lu et al 2010).…”