If the disease is severe enough to warrant the use of fungicides, be sure that the dogwood is a valuable specimen and the spray equipment can provide good coverage. sericea) is very susceptible to powdery mildew. ‘Cherokee Brave’, ‘Springtime’, and ‘Pygmy’ have partial resistance.
The flowering dogwood ( Cornus florida) cultivars ‘Appalachian Joy’, ‘Appalachian Blush ‘, ‘Appalachian Snow’, and ‘Appalachian Mist’ are very resistant to powdery mildew. Cultivars of the oriental dogwood Cornus kousa (such as ‘Milky Way’, ‘Milky Way Select’, and ‘National’) and many of the Cornus florida x Cornus kousa hybrids (such as ‘Aurora’, ‘Constellation’, ‘Celestial’, and ‘Stellar Pink’) are generally resistant to powdery mildew.
Resistant species and cultivars are available and should be considered for new plantings. Improve air circulation and sunlight penetration around the tree by removing overhanging branches and crowding vegetation. Prune out dead and infected branches and twigs. Begin by raking up and destroying all fallen leaves. Infection that begins early in the season can be devastating and may warrant the use of fungicides.Ĭultural controls should be the first line of defense. Prevention & Treatment: Most powdery mildews of landscape trees occur late in the summer and are therefore of little consequence.
Warm, dry days and cool, damp nights favor disease development. Powdery mildew is most common in dense, shady areas where the air circulation is poor. Spores are spread by wind to surrounding dogwood plants. Infected leaves exhibit marginal leaf scorch, dead patches, reddish discoloration, yellowing, and premature defoliation. New growth is covered with a fine, white, powdery coating, typically on the upper leaf surface. Powdery Mildew: Erysiphe pulchra (formerly Microsphaera pulchra) is the fungus that attacks leaf surfaces and tender shoots and causes powdery mildew. James Blake, ©2007 HGIC, Clemson Extension
#Red twig dogwood bush free#
If you would like to upload photos showing the affected leaves and location of infection on the bush for further diagnosis feel free to do so.Powdery mildew on dogwood (C ornus florida) leaves. Here are a couple of links that go into greater detail about soil testing and Septoria leaf spot: Light infections are a cosmetic issue only however repeated years of heavy infection can weaken the bush and lower its susceptibility to other diseases and/or winter injury. If your red twig dogwood has Septoria leaf spot the yellow spotted leaves would appear first in the lower portion of the bush. The fungal spores spread via rain and wind. Red twig dogwoods are prone to leaf spot diseases. Mulching at the base of the bush 6" away from the base will stop the soil from splashing the undersides of the leaves as well as help retain the water you applied. Water at the base of the bush and avoid getting the leaves wet.
#Red twig dogwood bush full#
Red twig dogwoods tolerate a wide range of soil conditions however they do best in moist to wet soils in full to partial shade. Check with your local extension office to see what soil testing services they provide. Your soil maybe adequate and not need anything additional. It is always recommended to have your soil tested to be sure it is not lacking so you can make an intelligent decision about applying fertilizer (or other enhancements) and to be sure the pH is correct. I think you are over fertilizing your red twig dogwood. Red twig dogwoods are a beautiful choice! They provide food for the birds and pollen for our pollinators and winter interest for you! You did not provide a photo so I will do my best to provide information for the symptoms described.įirst thing I want to address is the fertilizer frequency.
0 kommentar(er)
