Abstract:

The study was conducted to explore effects of ozone water on controlling root-knot nematodes with varying concentrations, and to provide theoretical basis for controlling root-knot nematodes. Ozone water was poured into the roots of three crops, ginger, watermelon and tomato, with four different concentration treatments, 0 mg/L, 1.0 mg/L, 1.5 mg/L and 2.0 mg/L at different growth stages. Root-knot and nematode counts were taken when ginger harvested, watermelon expanded and tomato plants removed, respectively. Compared with 0 mg/L application, the number of root-knot and nematode in ginger treated by 1.0 mg/L and 1.5 mg/L respectively decreased 59.1%, 93.3% and 57.8%, 88.3%, that of watermelon decreased 66.9%, 91.1% and 60.9%, 89.1%; and that of tomato decreased 70.0%, 93.8% and 73.6%, 92.2% respectively. There was no significant difference between 1.5 mg/L and 2.0 mg/L application. The study suggested ozone water with 1.5 mg/L application could effectively control nematodes.