Also watering three times a week sounds excessive. Remove all the dead material. http://extension.umd.edu/hgic/rhizoctonia-web-blight-flowersgroundcoversAt this point you can prune out the blighted areas. Infrequent, deep irrigation is better than frequent shallow irrigation, which only encourages shallow roots and will encourage weed growth.Check the soil moisture at least once a week. Scab: Leaves have a coating of gray to brown spores. A bit of compost in spring is all the fertilizer they need. Bottom line, you may be killing it with kindness. The one next to this one has started to turn brown also. Keep mulch no thicker than several inches and away from the base of the plants. Apply a fungicide to protect plants. It is now turning brown again. Question From: Mason, Ohio, United States. It can also cause root rots and stem cankers. 10 coreopsis Zagreb plants planted in May, 2017 did well until two weeks ago started to turn brown. The plant came back this spring and appreaed healthy. A bit of compost in spring is all the fertilizer they need. White fungal webbing forms around the base of the plant, and the leaves and blossoms turn brown as they wilt and die. Coreopsis do best in fast draining soil that is not overly rich. No chemical control is recommended. … They are in a mulched bed with good drainage. A member of the Asteraceae family, blooms of growing coreopsis are similar to those of the daisy. Coreopsis can suffer from crown rot (Sclerotium fungus), root rot (Rhizoctonia fungus) and stem rot (Alternaria, Rhizoctonia or Sclerotinia fungi). Soil that is dry beneath the surface means the plant has been underwatered. Watered with irrigation system three times a week. These thrive on moist leaf surfaces and cause transparent to brown or black spots that disfigure the leaves. The like to run on the dry side. Leaves and flowers turning brown can be a result of improper watering. Remove all the dead material. Best And Happy Yardening, Nancy. Provide plenty of spacing for good air circulation. We viewed your photos. Powdery mildew, root rot, blight, and rust can be treated with a fungicide. Best And Happy Yardening, Nancy. Dig into the soil to make sure thatthe soil is wet to a depth of six inches. 10 coreopsis Zagreb plants planted in May, 2017 did well until two weeks ago started to turn brown. They get ample sun with late afternoon shade. Coreopsis flowers may develop green or elongated petals. The Sclerotium rolfsii fungus causes crown rot in coreopsis plantings. Last year one of my Coreopsis turned brown and appeared dead. Sounds like stem rot. Colors of petals include red, pink, white and yellow, many with dark brown or maroon centers, which makes an interesting contrast to the petals. If you suspect wilt — your plants will wilt, turn brown, and die — remove infected plants. The root system should be okay. Various leaf spots are also caused by fungi. The like to run on the dry side. Coreopsis flowers may be annual or perennial and come in a variety of heights. Badly infected coreopsis leaves become discolored and distorted, then drop off. Sounds like stem rot. They get ample sun with late afternoon shade. Bottom line, you may be killing it with kindness. Coreopsis do best in fast draining soil that is not overly rich. Irrigation during the first year is important. This looks like Rhizoctonia web blight, a fungal disease. mh. Ask an Expert is made up of groups and individual experts. Mildew rarely affects coreopsis until after the first flowering. I have another bed of Coreopsis, these plants (so far) have not shown this problem. If there is overhead irrigation, plants will be more susceptible. They are in a mulched bed with good drainage. http://extension.umd.edu/hgic/rhizoctonia-web-blight-flowersgroundcovers. This is a dieback of foliage during hot humid conditions. To prevent aster yellows, use diatomaceous earth or insecticidal soap to keep leafhoppers at bay. Any thoughts or recommendations? Watered with irrigation system three times a week.
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