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A range of basidiomycetes including the edible mushroom  Pleurotus ostreatus  ( Po ) can suppress plant pathogens such as  Fusarium  spp. With the current increase in production and consumption of  Po  in Uganda, the spent  Po  substrate (SPoS) could be an alternative to manage Fusarium wilt of banana (FWB), caused by the soil borne pathogen  Fusarium oxysporum  f. sp.  cubense,  race 1 ( Foc ). This study determined the potential of SPoS to inhibit  Foc  in vitro and in potted plants. In vitro studies confirmed suppression of  Foc  in pure co-culture ( Po  vs.  Foc ) assays and media amended with different concentrations (0% to 50%  w / v ) of un-sterilized SPoS filtrates.  Foc  growth in the sterile SPoS filtrate was comparable to the water control, suggesting possible roles of biotic or thermolabile components of the SPoS. To further verify the suppressive effects of SPoS, pot experiments were carried out with a resistant (‘Mbwazirume’, AAA) and susceptible (‘Sukali Ndizi’, AAB) banana cultivar using both artificially and naturally infested soils. Independent of the inoculation method, SPoS significantly reduced the severity of FWB in pot experiments. Susceptible cultivar ‘Sukali Ndizi’ growing in substrates amended with SPoS showed lower (1.25) corm damage (Scale 0–5) than the un-amended control (3.75). No corm damage was observed in uninoculated controls. The resistant cultivar ‘Mbwazirume’, showed slight (0.25) corm damage only in the Foc-inoculated plants without SPoS. These findings suggest that SPoS could be used as part of the management practices to reduce the impact of FWB.

Spent Pleurotus ostreatus Substrate Has Potential for Managing Fusarium Wilt of Banana