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