Insects are not a significant problem. Crown rot is caused by the fungus Sclerotium. The fungus attacks plants at ground level in humid conditions. Flowers are not showy. Generally easy to grow. ‘Picturata’ – This is a female form with showy, dark green leaves with bright golden yellow centers. Southern blight. times, RHS Registered Charity no. Aucuba japonica disease? Karen Russ, ©2006 HGIC, Clemson Extension. There are no chemicals to control (or prevent) Aucuba blackening. Join the RHS today and support our charitable work, Keep track of your plants with reminders & care tips – all to help you grow successfully, For the latest on RHS Shows in 2020 and 2021, read more, RHS members get free access to RHS Gardens, Free entry to RHS members at selected times », Reduced prices on RHS Garden courses and workshops, Our Garden Centres and online shops are packed with unique and thoughtful gifts and decorations to make your Christmas sparkle, General enquiries We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place. Gold dust aucuba (Aucuba japonica). Other fans... Sooty Mold. Root rot is caused by a soil-borne fungi Phytophthora cinnamomi and P. citricola. Diseases are rare. The thick but oddly sparse roots don't grasp soil well, and the root balls of even container-grown plants can fragment in planting. Anyone have any ideas what it could be? Today numerous cultivars are available from garden centres. The ideal soil is moist, high in organic matter and well-drained, although it will tolerate almost any soil condition. It copes well with shady growing conditions but will also thrive in partial shade or full sun. Aucuba will grow in most soils in partial to full shade, although they can also do well in sun. It can grow up to 15 feet tall. 222879/SC038262, On established plants remove any affected foliage and shoots, Encourage strong regrowth by applying a balanced general fertiliser such as growmore around the base of the plant in early spring, Improve texture and drainage of heavy clay soils prior to planting by incorporating bulky organic matter such as composted bark, garden compost or well rotted farmyard manure to a larger area, Mulching with bulky organic matter can be also beneficial. Aucuba japonica has some common insect problems: Twospotted Spider Mite Gloomy Scale, Melanaspis tenebricosa (Comstock), Hemiptera: Diaspididae Mealybugs Found on Flowers and Foliage Control of Root-Knot Nematodes in the Home Vegetable Garden Aucuba japonica has some common disease problems: Septoria Leaf Spot of Tomato Southern Blight of Tomato and Pepper Aucuba japonica 'Picturata' Dislikes After cold and wet winters, the wetness around the roots can lead to blackening of the leaves and shoot tips. Black decay develops and moves up the stem. The leaves (and shoot tips) develop moist blackened areas. Copyright © 2020 Clemson UniversityClemson Cooperative Extension | 103 Barre Hall Clemson, SC 29634864-986-4310 | Contact UsHGIC@clemson.edu, College of Agriculture, Forestry and Life Sciences, Centipedegrass Yearly Maintenance Program. Aucuba usually grows 6 to 10 feet tall and 4 to 5 feet wide. One of the most attractive home landscape plants is the Aucuba japonica. Occasionally produces nice red berries. Aucuba make fine specimen plants, hedging, and screens.. Noteworthy CharacteristicsBold leaves, large fruits. Height: 6-12ft (2-4m), spread 5-6ft (l.5m). Black Splotches On Leaves Of Aucuba Japonica Variegata - Knowledgebase Question. It is currently in a confined space next to an evergreen tree so it has some height, about 5 ft but is only about 2 ft wide. Dark red aucuba (Aucuba japonica) fruit produced in October. may damage foliage and stems. There is no evidence that a pest or disease causes this and there is no need to apply pesticides. The plants are dioecious (that is, aucuba shrubs are either male or female). The leaves wilt and the plant dies. Problems. More information on Aucuba japonica. Problems with Spotted Laurels. This slow growing foliage plant assumes a shrub-like habit with glossy pointed leaves and graceful arching stems. Long lasting red berries appear in autumn. Mealybugs, scale, and nematode are occasional problems. COVID-19 Extension Updates and Resources ... More Information », Factsheet | HGIC 1057 | Updated: Nov 3, 2014 | Print. Answer from NGA March 28, 2004. This is especially true of varieties with variegated foliage. Branchlets stout, fleshy, quite glabrous and green, bud-scales hairy at the tips. Aucubas suffer from several diseases and pest problems. Aucuba japonica. Aucuba japonica Thunb. A dense, upright to rounded shrub, it usually remains neat and tidy. Overhead watering can lead to fungal foliage diseases such as leaf spot. Aucuba is generally grown as a foliage plant. Where the plant is only partially affected the solution is to remove blackened leaves as soon as they are noticed. This is especially true of varieties with variegated foliage. Leaf problems can develop, but usually as a result of the root problems infecting the plant. It also copes with pollution and salt-laden coastal winds. However, the dark, shiny, red fruit that matures in October and November is quite handsome, although partially hidden by the large leaves. Clemson University Cooperative Extension Service offers its programs to people of all ages, regardless of race, color, gender, religion, national origin, disability, political beliefs, sexual orientation, gender identity, marital or family status and is an equal opportunity employer. Aucuba japonica ‘Picturata’ with sunburn within the variegated portions of leaves after exposure to afternoon sunlight. However, despite this reputation, Aucuba can become stressed such as when its roots become waterlogged during cold, wet winters, for example, and as a result the leaves and shoot tips turn black. Height – usually 3 to 10 feet (1 to 3 m) Exposure – sun and shade Soil – ordinary and cool. Use it as a specimen, in screens or groupings, provided it is planted in shade. Aucuba (spotted laurel) is recommended for its robustness and ability to grow in dry, shaded sites. Quick ID Hints: Opposite,leaves with yellow flecks; Large, coriaceous leaves with waxy green stems . The blackening of the leaves is usually caused by root stress due to excess moisture levels in the soil during cold, wet winters. Aucuba is susceptible to root rots if planted in poorly drained sites. This plant is valued for its ability to thrive in the most difficult of garden environments, dry shade. It is the true Gold Dust Plant. Potted Japanese Laurel Plants Aucuba has dark green, leathery leaves. Joey Williamson, ©2014 HGIC, Clemson Extension. Mon – Fri | 9am – 5pm, Join the RHS today and support our charity. Rozannie Aucuba is primarily grown for its highly ornamental fruit. Aucuba japonica 'Maculata' (spotted laurel) Female form with large, shiny dark green yellow spotted leaves. Aucuba isn’t a classic watersaver plant, since it prefers semi-moist soil, but it’s ideal for that shady spot near the Paseo del Rio (or the AC condensate drain). The fruit is an ellipsoid, one-seeded, ½-inch long, berry-like drupe. Spotted laurel is a very beautiful shrub, as nice in summer as it is in winter with its cute red berries.. A summary of spotted laurel facts. Aucuba are dioecious with the berries growing in abundance on the female plants. Read on to learn more about container grown aucuba shrubs. Problems: Wet root rot, Southern blight and fungal leaf spots may affect Aucuba japonica plants. Question by mdudley0 March 28, 2004. It grows at a slow to moderate rate, but given good doses of water and fertilizer, it grows more rapidly. Aucuba japonica, commonly called spotted laurel, is a rounded, shade-loving, evergreen shrub in the Garryaceae family, a small family that includes just two genera Garrya and Aucuba.It typically grows to 6-10' (infrequently to 15') tall, unless pruned shorter. All recommendations are for South Carolina conditions and may not apply to other areas. Common name: Aucuba blackening Plants affected: All cultivars of Aucuba Main causes: Waterlogging during cold, wet winter Timing: Winter Native to moist woodland areas, thickets, valleys and along streams from Japan and China to the Himalayas. RHS Garden Hyde Hall Spring and Orchid Show, Free entry to RHS members at selected Most of these problems have to do with the roots. Japanese laurel (Aucuba japonica) is a striking evergreen shrub appreciated for its showy, lustrous foliage. Noteworthy Characteristics. 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