Biofumigation refers to the suppression of soilborne pests and pathogens by biocidal compounds, principally isothiocyanates released when glucosinolates in the tissues of Brassica plants are hydrolysed in soil. We investigated the biofumigation potential of brassicas in suppression against the soilborne plant pathogens occurring frequently in farming systems in North China. In vitro tests using cotton yarn jars as key equipment indicated that fumigation with B. oleracea leaf for 6 d at 32℃ could inhibit the...