Action level, concentration level of airborne eto in or at breathing level. Which is 0.5 ppm
Always decontaminate equipment after working in a field suspected of having the club-root fungus by thorough washing followed by spraying all surfaces with a disinfectant such as Lysol, formaldehyde, etc. Grow cabbage and related crops once every three to five years with crops not in the mustard family.
Cabbages need a steady supply of moisture. To help keep the soil moist and cool, apply mulch 6 to 8 inches (15 to 20 cm) deep around the plants. For fall crops, start plants or direct sow seed from mid-May (in cooler areas) to mid-June (in warmer areas).