Older landscape plantings can still thrive despite high disease pressure. Losses can be substantial due to this disease in nursery production. Most of the time, overwatering the lilac bush plant. On lilacs it develops during mild, moist weather. syringae, the bacterium that also causes bacterial blight of pear, blueberry, cherry, maple, and many other woody plants. Powdery mildew, bacterial blight and leaf spot are some of most common diseases that cause these problems. The bacteria can be found on old cankers, healthy buds, weeds, leaf surfaces and even soil, and is spread by rain, wind, tools, insects and infected plant material. It can also attack weakened or injured plants, such as those affected by frost damage, improper nutrition, inadequate pH, wounds, inappropriate pruning or budding, or other disease organisms. Pseudomonas overwinters on diseased twigs or on healthy tissue as an epiphyte. A cool, wet, rainy, spring season favors development of lilac blight, especially if rains follow a late frost or winter injury. Infected buds may die and never open in spring. Flowers can also be infected, first wilting then turning black. Ring spot virus can also infect lilac trees as well as lilac bushes, and in rare cases lilac wilt can also affect lilac trees, depending on where they are planted. These spots may join together and the leaf may crinkle at the edge or along its mid-vein. Lilac blight, mycoplasma and powdery mildew are common lilac disease problems. Young leaves turn black rapidly at the leaf margin and progress down to the petiole until the entire leaf dies. Lilacs Have Bacterial Blight 486585 - Ask Extension Source:. What causes trees and shrubs to die The presence of an insect or disease may not be the cause of the problem. Lilac Bush Diseases Pictures - Lilac Foliar Diseases On The Rise. On mature tissue, the leaf spots will enlarge along the stem, causing leaf death only around the infected area. Tips for diagnosing plant problems The majority of plant problems are not caused by a disease or an insect, especially if the plant has been in your landscape for less than two years. On young tissue, the disease will spread around the stem and girdle it, causing the stem to bend over and die. Initial symptoms include brown spots on stems and leaves of young shoots in early spring, usually surrounded by a yellow border or "halo." As these leaf spots continue to expand during moist conditions, the leaf tissue turns black. While environmental stressors and pests are common causes, lilac leaf curling can indeed be a symptom of certain diseases. syringae or bacterial blight is a common disease affecting not only lilacs, but also other woody plants such as blueberry bushes and cherry, maple and pear trees.
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