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