Bacterial leaf scorch (BLS) of hardwood trees, shrubs, and herbaceous plants, is caused by the bacterium, Xylella fastidiosa.The small, xylem limited bacterium is carried from plant to plant by small insects such as leaf … When xylella infects oak trees, for instance, it is called oak bacterial leaf scorch because the disease causes the leaves to look as if they’ve been burned or scorched. • Bacterial Leaf Scorch ( PPFS-OR-W-12) Dogwood Powdery Mildew By Kimberly Leonberger, Extension Associate, and Nicole Ward Gauthier, Extension Plant Pathologist Dogwood is a popular landscape tree throughout Kentucky. Powdery mildew. The disease is caused by Xylella fastidiosa, a bacterium that gets its name because it is limited within the plant to the water-conducting tissue (xylem) and because it has very specific nutritional needs (fastidious), Nearly all elm and poplar species are affected, as are numerous other trees including crabapple, beech, birch, maple, dogwood, horsechestnut, linden, oak, pine, redbud, sycamore, and tuliptree. Shade tree anthracnose. Seiridium and Botryosphaeria canker of Leylands. Dogwood; In different species, it causes different symptoms, earning it different common names. Plants that are prone to leaf scorch include Japanese maple, Norway maple, sugar maple, beech, ash, oak, linden, birch, alpine currant, horse chestnut, white pine, rhododendron, viburnum, and flowering dogwood. Description and Geographic Distribution. Tartarian dogwood (Cornus alba), redosier dogwood (C. sericea), and Cornelian cherry (C. mas) also are resistant to this disease. Lichens Needle cast diseases. Bacterial Leaf Scorch (BLS) of shade trees, also known as Pierce’s disease in grapes, is caused by a xylem-limited bacterium Xylella fastidiosa.This gram-negative bacterium causes leaf scorch due to the restriction of water flow through the xylem tissue. Wetwood, also known as slime flux, is a very common bacterial disease that occurs in many kinds of trees. Brown Rot - cherry. Dogwood Anthracnose Dutch Elm Disease . Bacterial leaf scorch . Bacterial Leaf Scorch. Bacterial Leaf Scorch The bacterium is Xylella fastidiosa , which invades the sap-conducting xylem cells, is associated with a leaf scorch of at least five tree species. Xylem is one of the two types of transport tissues in trees; by clogging these tissues the bacteria restricts the flow of water from the roots to the crown of the tree. Bacterial leaf scorch is a disease of shade trees, ornamental plants, and economically important food crops such as peaches, pecans, blueberries, and citrus. Bacterial Leaf Scorch, discovered in New Jersey in the early 1990’s, attacks shade trees and is caused by the xylem-clogging bacteria, Xylella fastidiosa. Root rot of trees & shrubs Rust diseases : Scab on apple. Avoid over application of fertilizer which can result in succulent new growth with greater susceptibility to disease. Introduction. Cankers-Trees and Shrubs. Bacterial leaf scorch affects elms and several species in the red and black oak group including northern red oak, Quercus rubra ; pin oak, Q. palustirs ; scarlet oak, However, once infected with powdery mildew, trees … Black knot. Prune out all dead or dying twigs and limbs during dry weather. Elsinoë Leaf spot (Dogwood) Fire Blight. SYMPTOMS. In Virginia landscapes it is most often observed on oak, elm, and sycamore; however, many other landscape tree species are susceptible to this disease. Bacterial leaf scorch is an important and often lethal disease of many landscape trees, particularly in the southern and eastern U.S.