The entire basin within the ridge is covered with cow manure or similar organic matter to a depth of 2 inches. Ammonium sulfate and sulfur, each at a rate of 1 lb. per 10 sq. The basin is then flooded with sufficient water to soak the soil to a depth of 3 feet. Trees or shrubs showing slight symptoms of the disease also can be cut back to one-half the top growth to compensate for roots lost to the disease. The soil should be kept moist for several weeks after treatment.
Recovery is usually complete within the season.
This technique is most effective when applied before the root rot is extensive. Resistant varieties have not been developed for crops that are normally susceptible to the disease. Therefore, crop and plant species that are naturally resistant must be selected. The following list is intended to aid in selecting resistant plants and avoiding susceptible ones for areas known to be infested. This publication was originally produced 4-99.