By using the proper pruning techniques , you can help encourage the shape, vigorous growth, flowering, and will make your Japanese lilac tree more resistant to pest and diseases. Japanese Lilac tree disease. The more effort you put into planting this cultivar and Ivory Silk tree care, the fewer Japanese tree lilac problems you will experience. Pseudocercospora pathogens seem to enjoy high humidity and moderate temperatures (~76 °F). While they are hatchi… Ivory Silk Japanese lilac thrives in cooler areas, specifically in U.S. Department of Agriculture plant hardiness zones 3 through 6 or 7. ... Fungal Disease. Lilac borer is one of them. Japanese Tree Lilac is a small flowering tree or large shrub in the olive family. If you plant in a shady location, for instance, they can develop powdery mildew. These bugs dig tunnels in the leaves in early summer. Sign up to get all the latest gardening tips! The larvae tunnel into the branches. It grows in the form of a pyramid in its early years but later expands to a rounded form. During the spring season, the larvae which have turned into adults exit the tree; adult borers are moths that resemble wasps. A. Splitting bark on a Japanese lilac tree can be caused by rapidly changing temperatures, especially when freeze-thaw cycles occur in winter, or rapidly changing water conditions, like a drought followed by heavy rains. The best known Syringa spp. 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. 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. Fortunately, the tree will probably be fine. Informational table showing disease name, symptoms, pathogen/cause, and management of Lilac diseases. The glossy green leaves of the Ivory Pillar™ Japanese Lilac Tree are the perfect complement to its flowers and many of your other flowers of your garden! This fungal infection slows the growth of plants, and in some cases may even kill them. Japanese lilac trees provide homes and shelter for wildlife. The cream-colored blossoms arrive in summer. On the other hand, too much nitrogen fertilizer can bring on bacterial blight. Common Problems With a Japanese Lilac Tree Bacterial Blight. Maintenance Practices In my Aug. 23 article, I wrote a piece on Japanese tree lilacs in response to many inquiries from readers who were enduring problems this summer from this otherwise beautiful tree species. Very badly infested branches may break off. This disease comes on during the rainy season. 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). It also helps to thin the crown, which increases air circulation. Sign up for our newsletter. 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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. All Rights Reserved. Several types of fungi attack trees, forming an infection with obvious symptoms. A full sun lover, this plant is easily grown in average, medium moisture, well-drained soils. Remove and destroy infected plant parts. 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. Since borers most commonly infest trees already injured or in decline, the first line of defense is keeping your tree healthy through proper care. Japanese Tree Lilac in flower . 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. Bacterial blight, also referred to as bacterial canker, is caused by the bacterium Pseudomonas... Wood Rots and Decays. Because Japanese lilac tree bears panicles of flowers that are 6 to 12 inches long, it is attractive enough to serve as a specimen. A common problem associated with Japanese lilac trees is incidence of wood rot and decay. Returning from vacation I found my Japanese Lilac tree is in dire straits. As with other lilacs, a few pests can cause problems in Japanese tree lilacs. Many problems with Japanese tree lilacs only arise if planted in a less-than-ideal location. If you are using a fertilizer that is high in nitrogen, stop. Plant Ivory Silk Japanese lilac in a full sun location. The tree accepts any well-drained soil, including sand or clay, and will grow in soil with a pH of acidic to slightly alkaline. See Lilac Bacterial Blight; Verticillium wilt: this fungus attacks through the roots and spreads upward through the xylem (i.e. Remove the infected areas of the tree and destroy them immediately. syringae. Diseases and Insects. 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. Symptoms include wilted stems and stems that are swollen at the base; the tree's bark may pull away from the tree. When the caterpillars emerge, they eat all the foliage. reticulata 'Willamette'): A more narrow, upright form (25 … Pest resistance: resistant to pests/diseases Use and Management. 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. 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. Recommended to you based on your activity and what's popular • Feedback They are very showy and last two weeks on the tree. Disease cycle of Pseudocercospora leaf spot . Properly Pruning on Japanese Lilac Trees and Shrubs!!! This tree is an appealing sight even when not in bloom. Another pest to look out for is lilac leaf miners. Drought resistant and free of pests and disease, this Japanese Tree Lilac is attractive as a small landscape tree or large shrub. 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. 6). Save For Later Print. Japanese tree lilac tolerates some drought and prefers cool summers. The leaves show no insect damage, but are partially discolored, partially yellow and orange. 1. Japanese Tree lilac is often seen in plantings like the one pictured to the right (Fig. The Ivory Silk cultivar is loved by many gardeners for its impressive size and glorious flower clusters. syringae, whose wings are semi-transparent and brownish. Prune the Japanese lilac tree immediately after flowering. This pest lays large amounts of eggs in late spring.
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