Growing Brassica juncea as a cover crop, then incorporating its residues provide complementary control of Rhizoctonia root rot of sugar beet

摘要: Biofumigation is increasingly viewed as a potentially useful technique for controlling soil-borne crop pathogens, but its efficacy has not systematically been demonstrated at field scale. We investigated the differences in observed field, by analysing mechanisms which Brassica cover can act biofumigant prevention of disease development. hypothesised that might have negative effect on pathogens whilst growing, and pulverisation this incorporation residues into soil may enhance effect. tested hypothesis carrying out three experiments 2006, 2007 2008 juncea (brown mustard) was managed different ways within sugar beet–winter wheat rotation effects beet root rot caused Rhizoctonia solani. Three treatments were studied: mustard pulled flowering (MP), crushed incorporated (MC) bare (BS) control. Weassessed each treatment incidence severity harvest. Over 3 years experiment, significantly higher BS plots than other MP MC plots. gave lower mean conditional (severity calculated diseased beets only) treatments. Mustard residue consistently effective decreasing from year to (43, 44 47% efficacy, determined comparison with plots, 2008, respectively), growing variable (36, 16 39% respectively). These findings provide insight crops affect diseases. implications possible use biological method diseases