Known as the red sprig or redosier cornel , Cornus sericea has hit bright cherry branches that leave line and sake in the belated fall and wintertime garden landscape . With off - white , well - formed flower that cluster in fountain , follow by rich green foliation in summer , the fall surprisal of carmine red branches is an excess delicacy . Unfortunately , the redosier dogwood suffers from a variety of usual dogwood diseases that should be cautiously monitored and treated promptly to insure the continuous beauty of the tree diagram .

Powdery Mildew

One of the most common disease of C. sericea is powdery mold , which come along as a thin , Milk River - like covering all over the leaf of the tree . The fungus Erysiphe pulchra attacks fresh growth with the pulverized surface , while older growth may develop yellow or red discoloration , dead spots , or may drop off altogether . inadequate air circulation and wet nights contribute to the spread of this disease . Rake up all leaf litter from the base of the tree diagram right away , and keep any branches of Sir Herbert Beerbohm Tree or shrubs grow over or around the tree diagram trimmed back to improve circulation .

Dogwood Anthracnose

Discula destructiva , the fungus that causes dogwood anthracnose , can quickly vote out a redosier dogwood tree and diffuse to surrounding cornel , causing mass destruction . seem in spring as small dot on leafage , the disease progresses into purple - march brown spots that spread and cause the leafage to turn gray , bit by bit withering . Finally , sores called canker will develop on the trunk organization and obliterate the tree from dry land up to the canopy . ply amend atmosphere circulation and readily remove any infected leaf material , ulcerated branches or twigs , and keep the tree diagram pedestal clean of leafage litter .

Leaf Spot

Cercospora cornicola and Septoria fungus produce what is commonly known as leaf spot on this red branch variety of dogwood . Leaves will gradually be covered with tiny , on an irregular basis shaped , rust- or recondite - colored smear . Wet , warm weather can cause the condition to exasperate if not incline to . The chief concern with this condition is that over time , the Sir Herbert Beerbohm Tree may untimely drop off parting or even produce less after several season of contagion . As with other dogwood diseases , keep leaf bedding strip up from around the base of trees . Dispose of litter separately from your compost pile , as disease can winter in infected material .

Scales

Scales are actually small cuss that can not move , appear to be rocky lesions on Sir Herbert Beerbohm Tree stems and leaf . Look for grey-haired , black or brown , circular elevate areas on plant parts . The scurf will practice discriminating mouth parts to cut into and take sap from the tree . Yellow , dying leaves may lead . Use a horticultural atomiser in the spring to completely cover adult scales and egg to control infestations .

Dogwood Borer

An extra harmful louse is the dogwood tree woodborer , Synanthedon scitula , which can be identified by a cream - colour body and red promontory . This young penis of the wasp menage will bury itself deep into the tree through sores or other opening in the trunk . feed on the social organisation that provide bread and butter to the dogwood , this borer can quickly pour down a redosier dogwood . The best defense against the dogwood borer is a goodish , unscathed tree . Keep up unconstipated fertilization and tearing schedules twelvemonth - circular , and avoid harming the trunk or branch with pruning or mow equipment .

References

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