Few; susceptible to scale and borers but is the most trouble-free lilac. Bacterial blight is probably the most serious disease on tree lilacs, and is most severe on the white flowering types. Remove the infected areas of the tree and destroy them immediately. White flowering varieties of common lilac are most susceptible to the disease. water conduits) of the host tree. Symptoms of this disease include black leaf spots, black stripes on shoots and new leaves turning completely black, dying very quickly. Where there is fungus, a Japanese lilac tree may be experiencing interior decay within the trunk or branches though the tree appears to be reasonably healthy. Another pest to look out for is lilac leaf miners. Disease cycle of Pseudocercospora leaf spot . As with other lilacs, a few pests can cause problems in Japanese tree lilacs. Flowers may also wilt and die. Keep pruning equipment clean to prevent disease transfer and prune affected branches back below any visible signs of abnormal growths or lesions. Japanese tree lilac is more resistant to disease than the common lilac, but is still susceptible to numerous pests. For chemical control, apply the insecticide permethrin, as recommended by the Kansas State University Research and Extension. ... Fungal Disease. A full sun lover, this plant is easily grown in average, medium moisture, well-drained soils. The bacterium, Pseudomonas syringae pv. Asked August 26, 2017, 8:36 AM EDT. Ivory silk tree lilacs do not resemble any other lilacs you might have in your garden. Step 4 Perform a rejuvenation pruning on mature Japanese lilac trees every few years by cutting one-third of the large, old stems all the way back to the ground in late winter. Gray Mold [Trees and Shrubs] (Botrytis cinerea and other species) Avoid overhead watering and apply two to three preventive copper fungicide treatments once every week to ten days when your Japanese lilac begins to produce new plant growth, according to the University of Illinois Extension. For control of this problem, keep your Japanese lilac tree vigorous for better immunity against disease. The tree accepts any well-drained soil, including sand or clay, and will grow in soil with a pH of acidic to slightly alkaline. Syringa, Lilac, Japanese tree lilac—Syringa spp. This tree is an appealing sight even when not in bloom. Japanese Lilac tree disease. The plant can grow to 30 feet (9 m.) tall and 15 feet (4.6 m.) wide. Lilac Bush Diseases. Sources of this disease can include old cankers, healthy buds, leaf surfaces and nearby weeds and grasses. Bacterial blight, also known as blossom blight or shoot blight, is a common and often serious disease of Chinese, Japanese, Persian and common lilac, as well as walnut, apple, pear, plum and cherry. You’ll also want to reduce fertilizer and thin your plants. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Seeds follow the flowers and last through the winter, giving the plant (along with its graceful form and pretty bark) some visual interest for the winter. Prune the Japanese lilac tree immediately after flowering. Japanese Tree lilac is often seen in plantings like the one pictured to the right (Fig. Japanese Tree Lilac is a small flowering tree or large shrub in the olive family. The more effort you put into planting this cultivar and Ivory Silk tree care, the fewer Japanese tree lilac problems you will experience. Although the problems with Japanese tree lilacs are few and far between, you’ll want to know about treating problems in Ivory Silk lilac should they arise. Japanese Tree Lilac. Common Problems With a Japanese Lilac Tree Bacterial Blight. Remove and destroy infected plant parts. Other fungal infections may produce the widely recognized puffball mushroom. The larvae tunnel into the branches. is the common lilac, Syringa vulgaris, with its fragrant, old-fashioned flower clusters in shades of lavender, pink, purple, and white.Japanese tree lilac is a larger species that can become a small tree growing to a height of 30 feet. Because Japanese lilac tree bears panicles of flowers that are 6 to 12 inches long, it is attractive enough to serve as a specimen. Factors that weaken or injure plants – wounds, frost damage, soil pH, poor or improper nutrition and infection by other pathogens – predispose them to the disease. Lilac bushes (Syringa spp.) Japanese lilac trees provide homes and shelter for wildlife. Ivory Silk tree care includes picking an appropriate planting site. It is losing leaves, and an entire branch seems to have lost all leaves, in essence died. Also called Japanese tree lilac, the ‘Ivory Silk’ cultivar is a large, rounded shrub with very large clusters of off-white flowers. reticulata 'Golden Eclipse'): A more compact form (to 24 feet high). Tarah Damask's writing career began in 2003 and includes experience as a fashion writer/editor for Neiman Marcus, short fiction publications in "North Texas Review," a self-published novel, band biographies, charter school curriculum and articles for various websites. Anthracnose fungus disease on Japanese tree lilac leaves. These Japanese tree lilac problems cause wilting and premature leaf drop. Leaf blotc… Grows up to 20 ft. tall (6 m) and 18 ft. wide (5.5 m). Sign up for our newsletter. Nutrient stressed yellow tree lilac leaves. Because the disease infects the lilac bush through its root system, the foliage of an entire branch may show signs of wilting quite suddenly. Several... Lilac Borer. Urban pollution does not create any extra problems. Updated: July 31, 2016. Japanese Tree Lilac in flower . With its superior resistance to powdery mildew disease, its leaves add to its beauty. Learn which plants thrive in your Hardiness Zone with our new interactive map! In lilac trees, the lilac borer lays eggs that hatch, producing larvae that bore into the wood of the lilac tree. Large clusters of creamy white flowers in early summer; bark similar to that of cherry trees (shiny with long horizontal lines). Here is more information about this problem: The same bacterium may cause shoot blight on … Infected trees display growths resembling mushrooms, often in the form of shelves in two categories, either soft (flat "fruiting bodies" that project from the tree) or conks (hard brown/white bodies). Lilac borer is one of them. All Rights Reserved. The cream-colored blossoms arrive in summer. The Ivory Silk cultivar is loved by many gardeners for its impressive size and glorious flower clusters. All parts of the plant may be infected, causing flowers to become brown and buds to blacken. These bugs dig tunnels in the leaves in early summer. The best known Syringa spp. reticulata 'Willamette'): A more narrow, upright form (25 … Plant in full sun in organically rich well-drained acidic soils. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. They usually lay their eggs on the stems of lilac shrubs and ash plants. Disease cycle of lilac bacterial blight The bacterium Pseudomonas syringae can overwinter in plant debris, healthy tissue, diseased cankers, perennial weeds, and soil. It grows in the form of a pyramid in its early years but later expands to a rounded form. During wet weather in the spring, the bacterium spreads to new growth by wind, splashing rain, insect vectors, or on pruning tools. Fungus on a Lilac Tree ; The Diseases of Climbing Roses ; Lilacs (Syringa vulgaris) are usually low-maintenance plants that thrive in U.S. Department of Agriculture plant hardiness zones 3 … 4 pictures total. These deciduous leaves sit atop a handsome red-brown trunk with cherry tree-like bark. Where there is fungus, a Japanese lilac tree may be experiencing interior decay within the trunk or branches though the tree appears to be reasonably healthy. Propagation is by seed or softwood cuttings. Other leaf spots caused by members of this group of fungi include leaf spot on olives, guava, and mulberry. Japanese tree lilac (Syringa reticulata) is at its best for two weeks in early summer when the flowers bloom. On the other hand, too much nitrogen fertilizer can bring on bacterial blight. perhaps the most pest-resistant Lilac, but that does not mean it is pest-free. Japanese lilac trees (Syringa reticulata) are low-maintenance trees that emit a pleasing fragrance and are well-suited for a variety of conditions including urban areas, residential neighborhoods and drought. Symptoms include brown spots on the leaves, surrounded with yellow borders; the edges of spots may overlap, forming a larger affected brown area of leaf tissue that rapidly dies. Common problems generally include pests and diseases like borers and fungal infections that the tree may resist if kept in good health. Japanese tree lilac is also popular as a garden specimen or as an accent in a shrub border. The leaves show no insect damage, but are partially discolored, partially yellow and orange. Very badly infested branches may break off. Informational table showing disease name, symptoms, pathogen/cause, and management of Lilac diseases. If you are using a fertilizer that is high in nitrogen, stop. Maintenance Practices Look out for for a white, flour-like substance on your lilac’s leaves. Returning from vacation I found my Japanese Lilac tree is in dire straits. Family Oleaceae (Olive family) Plant identification. Japanese tree lilac tolerates some drought and prefers cool summers. Golden Eclipse Japanese tree lilac (Syringa reticulata ssp. syringae, whose wings are semi-transparent and brownish. Articles. During the spring season, the larvae which have turned into adults exit the tree; adult borers are moths that resemble wasps. Features. If you catch these pests early, just pick off the miners by hand. Its need for full sunlight can limit the locations an individual can be planted, so open spots like this can be beneficial to the tree's health The normally dark green leaves will turn yellow during the fall. Plan the perfect garden with our interactive tool →, Kansas State University Research and Extension: Problem: Ash/Lilac Borer, University of Florida IFAS Extension: Japanese Tree Lilac; Edward F. Gilman and Dennis G. Watson, University of Illinois Extension: Bacterial Blight, University of Illinois Extension: Wood Rots and Decays, University of Illinois Extension: Japanese Tree Lilac. This fungal infection slows the growth of plants, and in some cases may even kill them. syringae infects in wet weather when new shoots are developing. If you do have powdery mildew, remove all infected parts of the plant and apply a … These are very niggling pests that are actually the larvae of a wasp-like moth called Podosesia syringae var. 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Damask holds a Master of Arts in English and creative writing from the University of North Texas. It deserves to be in any landscape. If you plant in a shady location, for instance, they can develop powdery mildew. Verticillium wilt is a soil-borne fungi that affects hundreds of woody plant species, including lilacs. 1. syringae. See Lilac Bacterial Blight; Verticillium wilt: this fungus attacks through the roots and spreads upward through the xylem (i.e. Pest resistance: resistant to pests/diseases Use and Management. The Japanese Tree Lilac is a small plant somewhere between a shrub and a tree, ideal for front yards and areas where you want natural beauty, but don’t want your view obscured (the oldest specimens can grow up to 20 feet tall, but this growth can be controlled). Many problems with Japanese tree lilacs only arise if planted in a less-than-ideal location. Japanese Tree Lilac is one of the easier flowering trees to grow, and it may just be that it is not old enough yet to flower every year. If your plant has bacterial blight, treating problems in Ivory Silk lilac involves pulling out and destroying infected plants. You can identify powdery mildew by the white powdery substance on leaves and stems. produce clusters of fragrant flowers that range in color from white to deep purple. 6). Save For Later Print. Use as a specimen. Your goal is to get rid of any branches that appear to be dead, wilted, damaged or vulnerable to disease. Both forms have a lovely shape that looks great in shrub borders or as specimens. It is during these periods that high infection often occurs, however, symptoms … Diseases and Insects. A common problem associated with Japanese lilac trees is incidence of wood rot and decay. This pest lays large amounts of eggs in late spring. Cut out infected stems and destroy them. Leaves develop gold edges as the season progresses. Several types of fungi attack trees, forming an infection with obvious symptoms. Lilac blight bacteria over-winter on diseased twigs or on healthy wood. This is a common bacterial infection that causes health problems for the Japanese lilac tree, often attacking plants during excessively wet periods, entering through wounds or natural pores. Leaf spot on Japanese tree lilac has been identified as a fungus belonging to the genus Pseudocercospora. Keep your eye out for young shoots that develop black stripes or leaves that develop black spots. Ivory Silk Japanese lilac thrives in cooler areas, specifically in U.S. Department of Agriculture plant hardiness zones 3 through 6 or 7. This disease comes on during the rainy season. The clusters of white, fragrant flowers are about a foot long and 10 inches wide. Disease Symptoms Pathogen/Cause Management; Ascochyta blight: In the spring, the current year's shoots and flower stalks are girdled, wilted, and brown.