Affected parts later become covered with a whitish mold. Spray plants with protective fungicide just before flower buds open and at 10 day intervals until flowering ceases. Remove and burn affected parts. Affected plants may wilt suddenly and die or they may be unthrifty if only a portion of the root system is infected. A brown discoloration of the wood may be seen in the basal portions of the stems and in the main roots.
Plants are much more susceptible when planted in poorly drained areas or planted too deeply.
Plant only as deep as the plants originally grew. Drench with a soil fungicide before plants are seriously affected. Plant are unthrifty or fail to grow. Select healthy bushes with unrestricted root systems showing active growth for planting. Plant in well-drained soil avoiding sites exposed to full sunlight or to the west sun.