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Mustard (Brassica spp.) cover crop residue has been reported to have signifi cant 'biofumigant' action when incorporated into soil, potentially providing disease suppres- sion and yield improvement for the succeeding crop. The effects of growing over-winter mustard cover crops preceding processing tomato (Lycopersicon escultentum Mill.) pro- duction were investigated in six fi eld trials in the Sacramento Valley of California from 2002-04. A selection of mustard cover crops were compared to a legume cover crop mix, a fallow-bed treatment (the current grower practice in the region), and in two of the six trials, fumigation treatments using metam sodium. Mustard cover crops removed 115 to 350 kg·ha -1 N from the soil profi le, reducing NO 3 -N leaching potential. Soil populations of Verticillium dahliae Kleb. and Fusarium spp. were unaffected by the cover crops, and there was no evidence of soilborne disease suppression on subsequent tomato crops. Mustard cover crops increased tomato yield in one fi eld, and reduced yield in two fi elds. In one of two fi elds, metam sodium fumigation signifi cantly increased tomato yield. We conclude that, while environmental benefi ts may be achieved, mustard cover cropping offers no immediate agronomic benefi t for processing tomato production.

Mustard Cover Crops Are Ineffective in Suppressing Soilborne Disease or Improving Processing Tomato Yield