Dead flowers cling to plants instead of falling to ground. The disease is more severe in cool, moist springs. Remove old mulch and replace with new in early spring. Drench soil area under plants with Terracolor in January. Spray with Thylate or Benomyl when blooms begin to open.
Good coverage is essential.
Bayleton may be used once when buds show color. Leaf gall development is also favored by cool, moist weather. Handpick and destroy affected leaves. Spray with Bayleton, Ferbam, Captan, or a fixed copper fungicide. Leaf spots Brown or bronzed leaves, with tiny black fruiting bodies on the dead tissues.