MISeqv2 of Kit blank: DNeasy PowerWater
Kit blanks were loft open to capture lab microbes during extraction. We extracted DNA using a PowerWater kit according to manufacturer protocol. We amplified the ITS2 region using the fungal specific primers ITS9 (GAACGCAGCRAAIIGYGA; [41]) and ITS4 (TCCTCCGCTTATTGATATGC [42]).