In a 1-year experiment in a naturally infested soil with Fusarium oxysporum f. sp. vanillae, Trichoderma guizhouense NJAU 472 and Bacillus amyloliquefaciens W19 amended to an organic fertilizer at a rate of 3% appeared to halve disease. These biocontrol agents appeared affect the microbial soil community, and possibly the increase in Lysobacter sp. is the main factor involved.
Comments: It is to be investigated if these results can be repeated on different soil types. Also the high application of 3% is too high to make the method economically viable. Nevertheless the results are promosing, as Fusarium oxysporum is notoriously difficult to manage. It would be interesting to see how other formae speciales respond in other pathosystems.