If the value of the crop is not at least the same or more than the value of the fumigation process, then fumigation should not be recommended. Thus most field crops, many vegetables, and some specialty crops are not worth fumigating. In such cases, rotational control, sanitation and suppressive cropping practices must be used. An example where fumigation can be combined with crop rotation is carrots. Carrots should be grown first after fumigating infested muck.
Onion is a lesser host and less damaged and celery is a good host but moderately damaged.
Follow carrot with celery or onions. Potato is a good host but not severely damaged. Grow potatoes last in the rotation, then fumigate. Telone C-17, Vorlex Plus, Vorlex Plus CP, Vapam and Busan are fungicidal and nematicidal. No fumigant is cost effective against weeds.