• The Norman Garden Festival will be held, rain or shine, on 8 a.m. to 2 p.m. Saturday, April 14, Cleveland County Fairgrounds, 615 E Robinson, Norman. The festival will feature vendors, locally grown plants as well as educational speakers, the Cleveland County Master Gardener Plant Sale, informational booths, and Demonstration and Teaching Garden tours. This program is sponsored by the Cleveland County Oklahoma Cooperative Extension Service in cooperation with the Cleveland County Fairgrounds.
• The Annual Spring Plant Sale of the Oklahoma City Council of Garden Clubs, Saturday, 8 a.m. to 2 p.m. or until sold out, at Will Rogers Garden Exhibition Building, 3400 N. W. 36th St. Proceeds go to garden council projects including Garden Festival in the Park, Christmas Nature Tree and activities, scholarships to OSU/OKC, design workshops, educational programs and promotion of Will Rogers Park. Plants of all types are grown by local gardeners and can be spring-planted. Public is welcome. Call 722-8822.
• Central Oklahoma Hemerocallis Society Spring Daylily Sale, 8 a.m. to 2 p.m. April 21, Will Rogers Exhibition Center, 3400 NW 36. Call LaDonna Evans, 550-7632.
• Central Oklahoma Hemerocallis Society Show and Sale, 1 to 4 p.m. June 9, Will Rogers Garden Center, 3400 NW 36. Call 550-7632.
Oak disease poses growing problem
Losing a tree can be stressful for homeowners, financially and emotionally. For all the years it takes a tree to mature, it is devastating for one to die rapidly because of disease. This is true with hypoxylon canker in oaks. I've seen the most devastating outbreaks in the cross-timber areas of eastern Cleveland County, where acres of trees have been lost.
Like most fungi, hypoxylon canker is spread from one tree to the next by wind, rain, tools and insects.
Symptoms of hypoxylon canker include yellow, wilted leaves followed by death of entire branches. As the disease progresses and branches die, bark is lost, exposing the fungal growth or stroma. The stroma appears as sunken areas that are brown, silver, black, dark gray, or white, depending on the life stage of the fungus. There is no effective means of control for hypoxylon canker. Infected trees should be removed to prevent secondary infections on other trees. The homeowner should completely remove trees and grind the stumps when greater than 15 percent of the tree canopy is dead. Remaining branches and stumps can harbor the fungi causing a source of reinfection.