When this fungus occurs it is often necessary to include chloropicrin in the fumigant. Methyl bromide may be injected by chisels if the soil is covered immediately by plastic. It is the only soil fumigant that needs to be applied under plastic covers. It is the best fumigant for controlling Verticillium dahliae. It generally is combined with methyl bromide in various mixtures depending upon the organisms in the soil.
Some fungicides work best if incorporated before planting.
Others may be incorporated or applied after sowing or planting. Some soil fungicides control a narrow range of organisms while others control a wide range of organisms. Some of the narrow range chemicals are the most effective in controlling a specific organism. Combinations are used to increase the number of organisms controlled. It is applied as a soil drench or as a foliar spray.