Efficacy of solarization and cabbage amendment for the control of Phytophthora spp. in North Florida

The effects of soil solarization with or without cabbage leaf amendments on the survival of Phytophthora spp, were evaluated in several North Florida soils. Soil temperature under solarization treatments reached a maximum of 47 degrees C at a 10-cm depth, but only 41 degrees C at 25 cm. Solarization with a clear, gas-impermeable film was as effective as methyl bromide in reducing populations of P. nicotianae at a 10-cm depth but had no effect on populations at a depth of 25 cm. Populations of P. capsici after solarization with either a clear, low-density polyethylene or a clear, gas-impermeable film were similar to methyl bromide treatment at the IO-cm depth, while at the 25-cm depth, no reduction in populations was observed. Incorporation of cabbage into the soil at a rate of 6.6 to 8.9 kg/m(2) did not enhance the effectiveness of solarization in reducing populations of either Phytophthora sp.