## 1 Introduction  
Vascular wilt diseases, caused by _Verticillium dahliae_ and _Fusarium oxysporum_, are devastating diseases of strawberry (_Fragaria \(\times\) ananassa_ Duch.) that severely affect the production of this crop. Due to the fact that the persistent resting structures produced by the pathogens are able to survive in the absence of hosts for long periods of time, vascular wilt diseases are particularly difficult to control [1, 2]. Due to the lack of resistant strawberry cultivars, soil fumigation with methyl bromide is an effective way to manage vascular wilt diseases, but this fumigant has been withdrawn from routine use under the Montreal Protocol [3]. Non-chemical soil disinfections, such as steam sterilization and solarization, show potential in reducing soil inoculum levels, but these approaches may negatively impact soil microbial communities and associated functions [4]. Crop rotation is generally ineffective for Verticillium and Fusarium wilt of strawberry because of the wide host range of the pathogenic fungi. Therefore, the need to develop eco-friendly and highly efficient biocontrol agents (BCAs) for sustainable strawberry production is extremely urgent. Over the past few decades, impressive progress has been made in the development, registration and commercialization of BCAs based on microbial antagonists. Members of the _Bacillus_ genus are good candidates as BCAs because they form endospores that can be readily formulated into biopesticide products [5; 6]. Moreover, they produce a vast array of bioactive molecules with strong inhibitory potential against plant pathogens, such as bacteriocins, lipopolysaccharide, siderophores, polyketides and volatile compounds [7; 8]. Among these metabolites, non-volatile substances have received considerable research attention, whereas volatile compounds are less frequently studied. Volatile organic compounds (VOCs) are low-molecular-weight (<300 Da) organic compounds that are characterized by a low boiling point, high vapor pressure and lipophilic character [9]. Several studies have demonstrated that the VOCs emitted by microbes may benefit plants by promoting growth, activating defence responses, and suppressing or eliminating potential pathogens [10; 11; 12; 13; 14; 15]. Moreover, as naturally occurring chemicals, VOCs emitted by microorganisms are biodegradable. Therefore, microbial VOCs can be exploited as a sustainable strategy for use in crop enhancement and protection. _Muscodor albus_, a biofumigant fungus, is the first commercially available BCA acting through its volatile emissions. In-package biofumigation with _M. albus_ was shown to provide an effective control of fungal decay in grapes and extend their shelf life [16]. In addition, previous publications have shown the potential application of _M. albus_ to protect building materials from biological damage and manage plant-parasitic nematodes of plants [17; 18]. The successful application of _M. albus_ inspired researchers to further explore the benefits of employing VOCs produced by antagonistic bacteria to control plant diseases. Bacterial VOCs have been demonstrated to inhibit the growth and differentiation of numerous phytopathogenic fungi, suggesting that the complex mixtures of bacterial emissions represent a source of novel antifungal natural substances. For example, dimethyl disulfide (DMDS), a volatile sulphur compound frequently emitted by bacteria, has been shown to possess broad-range antifungal activities [19; 20]. DMDS-containing products are used as novel soil fumigants. Recently, [PERSON] et al. [21] reported the inhibitory activity of 2,6-di-tert-butyl-4-methylphenol and 2,4-di-tert-butylphenol produced by _B. siamensis_ G-3 against _Botrytis cinerea_ and _Rhizopus stolonifer_ both in vitro and in vivo. Given the diversity of microbes, only a small fraction of these volatile metabolites have been detected and studied, and more novel compounds with interesting bioactivities are yet to be discovered.