Use as a specimen. Ivory Silk Japanese lilac thrives in cooler areas, specifically in U.S. Department of Agriculture plant hardiness zones 3 through 6 or 7. Fortunately, the tree will probably be fine. This pest lays large amounts of eggs in late spring. Lilac borer is one of them. 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. These bugs dig tunnels in the leaves in early summer. Anthracnose fungus disease on Japanese tree lilac leaves. Grows up to 20 ft. tall (6 m) and 18 ft. wide (5.5 m). It also helps to thin the crown, which increases air circulation. Because the disease infects the lilac bush through its root system, the foliage of an entire branch may show signs of wilting quite suddenly. The same bacterium may cause shoot blight on … Articles. Verticillium wilt is a soil-borne fungi that affects hundreds of woody plant species, including lilacs. Disease cycle of lilac bacterial blight The bacterium Pseudomonas syringae can overwinter in plant debris, healthy tissue, diseased cankers, perennial weeds, and soil. 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. Keep pruning equipment clean to prevent disease transfer and prune affected branches back below any visible signs of abnormal growths or lesions. If your plant has bacterial blight, treating problems in Ivory Silk lilac involves pulling out and destroying infected plants. Several... Lilac Borer. Ivory Pillar™ Japanese tree lilac (Syringa reticulata ssp. Both forms have a lovely shape that looks great in shrub borders or as specimens. Common Problems With a Japanese Lilac Tree Bacterial Blight. syringae, whose wings are semi-transparent and brownish. See below for more information. They usually lay their eggs on the stems of lilac shrubs and ash plants. The cream-colored blossoms arrive in summer. 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. These Japanese tree lilac problems cause wilting and premature leaf drop. Pest resistance: resistant to pests/diseases Use and Management. Since borers most commonly infest trees already injured or in decline, the first line of defense is keeping your tree healthy through proper care. syringae. The Ivory Silk cultivar is loved by many gardeners for its impressive size and glorious flower clusters. Family Oleaceae (Olive family) Plant identification. Cut out infected stems and destroy them. This disease comes on during the rainy season. Bacterial blight is probably the most serious disease on tree lilacs, and is most severe on the white flowering types. The leaves show no insect damage, but are partially discolored, partially yellow and orange. reticulata 'Golden Eclipse'): A more compact form (to 24 feet high). Bacterial blight, also referred to as bacterial canker, is caused by the bacterium Pseudomonas... Wood Rots and Decays. While they are hatchi… As with other lilacs, a few pests can cause problems in Japanese tree lilacs. These trees only need fertilizer every few years. Informational table showing disease name, symptoms, pathogen/cause, and management of Lilac diseases. This fungal infection slows the growth of plants, and in some cases may even kill them. 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. 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. Urban pollution does not create any extra problems. Sources of this disease can include old cankers, healthy buds, leaf surfaces and nearby weeds and grasses. 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. Landscape Uses for Japanese Lilac Trees . water conduits) of the host tree. All Rights Reserved. , they can develop powdery mildew is the most pest-resistant lilac, but that does mean. ; verticillium wilt is a soil-borne fungi that affects hundreds of woody plant species, lilacs! All leaves, and management of lilac Shrubs and ash plants thin your plants feet ( 4.6 m. wide. 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