Biofumigation and solarization were tested as possible organic controls of white mold (Sclerotinia sclerotiorum), a soil-borne pathogen of cool-season vegetable crops commonly found in high tunnels. Biofumigation was also tested as a possible control of the warm season vegetable pathogen Phytophthora capsici. Pacific Gold mustard was identified as a potential biofumigant crop with a combination of high biomass production and glucosinolate concentration. Laboratory studies showed both pathogens to be susceptible to glucosinolates extracted from the mustard, but soil incorporation of field-grown biomass did not introduce sufficient glucosinolate to reduce disease pressure. Summer solarization in high tunnels destroyed white mold sclerotia.
- Identify brassica varieties that inhibit survival and growth of S. sclerotiorum and P. capsici in lab-based bioassays. Determine the potential of brassica residue incorporation and solarization – alone and in combination – to reduce disease pressure from S. sclerotiorum and build biologically active soils in high tunnels used for year-round vegetable production. Determine the potential for brassica and non-brassica cover crops to reduce disease pressure from P. capsici and build biologically active soils in field vegetable production systems.