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Abstract Banana wilt caused by Fusarium oxysporum f. sp. cubense tropical race 4 (Foc TR4) is a globally distributed soilborne disease that poses a serious threat to banana production. Many different control measures have been implemented but have not proven effective enough. Here, a combined strategy of Fusarium wilt control involving the recognized biological agent B. velezensis EB1 and the bioactive compound potassium sorbate was evaluated. Our results showed that potassium sorbate inhibited Foc TR4 in a dose-dependent manner. Potassium sorbate did not affect the growth of EB1 in vitro; instead, it promoted its growth and antagonistic ability by upregulating the expression of antagonistic genes. In greenhouse experiments, the combined application of EB1 and potassium sorbate significantly reduced the disease index of banana by suppressing fungal growth in roots while promoting plant growth. Overall, our results indicate that potassium sorbate combined with B. velezensis EB1 has strong potential for the sustainable management of banana Fusarium wilt.
Liu et al. (Fri,) studied this question.
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