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.
Flowering cabbage plants can be started from seed. Start the seeds indoors in December to have the plants ready to transplant outdoors in February or March. Transplants are also available at most garden center. Plant 12 to 18 inches apart in full sun.