Commonly infected woody plants include maple, smoke-tree, catalpa, and magnolia, among others. Damage. Excessive moisture leaves the laburnum susceptible to root rot. It is a disease of the xylem, or water-conducting tissues, in the plant. Maintaining healthy dogwood trees by following the recommended cultural practices is the first line of defense in reducing any of these problems. Laburnum alpinum is a related tree which is just as beautiful in flower. Leaf-scald can also be a problem where bark is exposed to afternoon sun in winter. Bees, rain, and infected pruning tools spread the disease. Leaf-scald can also be a problem where bark is exposed to afternoon sun in winter. 12 years ago. small, obovate-shaped tree; yellow flowers in pendulous clusters; blue-green leaves; olive green bark; leggy at base of the plant; persistent pods possible; Propagation. twig kill in severe winters; canker disease and twig blight; can be leggy at the base; seeds are poisoned; need for protected, specific site requirements; ID Features. If you are having problems, it is not a tree that I would waste spending time and energy over. Please view this page on a tablet or larger screen for the moisture graph. Diseases Leaf spot, laburnum vein mosaic and especially twig blight can be problems. leaf spot, laburnum vein mosaic, aphids, grape mealybug; twig blight can be serious. Laburnum alpinum is a related tree which is just as beauti-ful in flower. Laburnum Tree Disease. Also prefers cooler summer areas. Pests Tree can be attacked by aphids or mealy-bugs. steveorton. [www.apsnet.org] Examples of twig blight. Kabatina twig blight mainly occurs on new branches, but both diseases can infect arborvitae at the same time. The bark at the base of the blighted twig takes on a water-soaked appearance, then looks dark, sunken, and dry. Two main types of twig blight occur on arborvitae, caused by the fungal pathogens Kabatina thujae and Phomopsis juniperovora, respectively. The flowering dogwood (Cornus florida) is a small, deciduous ornamental tree that is native throughout the eastern United States.Although dogwoods are well adapted to South Carolina, they can be affected by many pests and diseases. This year it flowered as usual. Pests Tree can be attacked by aphids or mealy-bugs. Diseases Leaf spot, laburnum vein mosaic and especially twig blight can be problems. There are flowers/shrubs underneath which are not effected. [www.bairstreeservice.com] [www.caf.wvu.edu] [www.apsnet.org] There are several forms … Leaf scald can show up on a laburnum, if the tree is exposed to full sun during the winter. Tips of infected branches may hang down. Dislikes low pH soils and most especially, winter damp soil conditions. Fire blight is caused by bacteria that are particularly active in warm, moist weather. Laburnum also shows a vulnerability to certain diseases, such as leaf spot and twig blight. It is about 20 years old. To add to the confusion, the symptoms are essentially the same. Does anyone know what has happened? Moisture Tolerance Graphic. Laburnum can get a disease called canker or another called twig blight which is what I suspect might be what is wrong with your tree. Verticillium wilt is a serious fungal disease that causes injury or death to many plants. I have a laburnum tree in my front garden. It seems green when I broke off a twig. Juniper twig blight disease is a disfiguring plant problem, although annual persistent symptoms can cause severe damage to young plants. Other. Today I noticed that all the leaves have gone brown and died. native to central and southern Europe; transplant B & B or from container. Twig Blight. Juniper Twig Blight Disease. Juniper twig blight can be caused by Phomopsis, Kabatina or Scllerophoma pythiophila but the more commonly found is the Phomopsis fungus. ... Other than being short-lived, it is also prone to viruses, leaf spot, twig blight and root rots. Bare Root Transplanting. Root rot is also a problem in soil kept too moist.