The fungus is dispersed from field to field by movement of infected plants, especially transplants, and movement of infested soil on machinery and surface water. Do not use tailwater from contaminated fields to irrigate noninfested fields because the fungus can be transported in water. Cultural control and applications of lime. Lime does not kill the fungus, but creates soil conditions unfavorable for spore germination. In general, apply lime if soil pH is lower than 7.2.
Annual applications are usually necessary.
Not all soils respond favorably to this treatment. The Regents of the University of California. All rights reserved. For noncommercial purposes only, any Web site may link directly to this page or photo file. Unfortunately, we cannot provide individual solutions to specific pest problems.