Landscape diversity lends itself to custom tailoring of site specific disease control methods, which often favor biological and cultural techniques. Some cultural practices provide broad-spectrum disease management. Altering disease susceptibility of landscape plants. Disease Management Practice Diseases or Pathogens Affected Use disease-resistant cultivars and species. This biological control act is the safest and most effective way to control diseases.
Many nurseries provide disease resistant information for their cultivars.
Fertilize based on soil tests. Avoid excess nitrogen which promotes rapid growth and increased susceptibility. This biological control for crown gall, used in nurseries, could be practical where large numbers of these plants are to be used in the landscape. Keep trees and shrubs well watered, use mulch around the base of plants. Provide adequate fertility.