Management: Send a sample to MSU Diagnostic Services. Accurate diagnosis is made by looking at differences in spores. In general, avoid pruning when foliage is wet; avoid shearing or excessive wounding. When pruning out diseased plant tissue, disinfest pruning tools. Water early in the day to allow foliage to dry before nightfall. Avoid excessive fertilization, as it promotes succulent new growth. When installing new plantings, allow enough space between plants for good air circulation. Treatment timing and fungicide recommendations vary depending on which fungus is present.