Possible fungal diseases include phomopsis gall, twig blight, anthracnose, leaf spot and yellow leaves. It's known for having very few issues with pests and diseases. The back of the mottled-brown tarnished plant bug has a yellow Y pattern. Q. Why Is My Forsythia Bush Wilting? Anthracnose makes moist, sunken spots with fungal fruiting bodies in the center. Gall symptoms on forsythia are brown clusters which encircle the stem which vary in size from ¼ to more than an inch in diameter. Overview Information Forsythia is a shrub. It's leaves suddenly turn a sickly pale green colour & are very limp. Forsythia x intermedia 'Kolgold' matures at around 4 to 5 feet in height and spread. Diagnosing Yellow Leaves on Forsythia. Managing Pests and Disease. Signs of leaf spot are, as the name suggests, spots on the leaves. Forsythia flowers get most of the attention, but their leaves also have a story to tell. Clarkson earned a Bachelor of Arts in journalism from the University of Florida. Although forsythia is vegetatively winter hardy to USDA Zone 5, the flower buds of many forsythia are often damaged by cold winter temperatures and late freezes in Zone 5. - I have a new forsythia bush this year. The form varies depending on the variety. On forsythia bushes, the galls may develop along the stems or near ground level. The forsythia bush (Forsythia x intermedia) is an early harbinger of spring, with its cherry yellow blooms often peeking through the last of the snow in northern gardens. Galls on forsythia caused by Phomopsis have diameters of about 1 to 2 inches, a bumpy or rough texture and are mostly spherical. The Connecticut Agricultural Experiment Station recommends spraying with acephate in early August only if you see many of the adults and your forsythia is severely damaged. Insects, Diseases, and Other Plant Problems: Although deer resistant, this plant is occasionally damaged by deer. Forsythias are hardy, attractive bushes which delight us every spring with their early, golden blooms. These bugs have soft, pear-shaped bodies that can be brown, gray, yellow, black, green or red. They tend to feed on the underside of leaves and you'll often see the white shed skins. Forsythia through the seasons: early spring (L), late spring (LC), summer (C), fall (RC), and winter (R). 'Northern Sun' forsythia. Also prune out obviously dead (brittle, no green if you scratch the bark off.) Treatment would include pruning to open the canopy and allow airflow through the plant and cleaning up any dead plant material around it. Aphids are a common, but rarely fatal, problem for young forsythias. A: Forsythia bushes usually are quite easy to grow. A fungicide can be helpful but it is best to try to identify the disease for more effective treatment. A forsythia with yellow leaves may be occurring due to any number of diseases… Prune to maintain a healthy, vigorous shrub by removing a few older canes to the ground every 2 to 3 years. Below are the more common ones: Fungicides are generally only effective if sprayed before the plant shows signs of disease. Bright, one-inch yellow flowers have a slight green tinge and appear a few weeks after other forsythia. White Forsythia. If you can rule out overcrowding, dry conditions and topical injury as well as any pests, you are left with a plant that probably has a fungal disease. All Rights Reserved. The two-banded Japanese weevil (Callirhopalus bifasciatus) eats the forsythia's leaf margins (edges), leaving behind crescent-shaped notches. Problems. Branches and leaf buds tolerate cold temperatures better than flower buds, but they can still suffer damage. This is usually just at leaf formation. These bugs have soft, pear-shaped bodies that can be brown, gray, yellow, black, green or red. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. Forsythia grows at a rate of about 30cm / 1ft per year when established. Some susceptibility to leaf spot and crown gall. Q. The leaves on your plants are trying to tell you something. A few days later they turn brown then the entire branch dies. They leave behind their waste, called honeydew, a clear liquid that can coat the shrub and lead to the development of sooty mold. Forsythia are deciduous shrubs typically growing to a height of 1–3 m (3 ft 3 in–9 ft 10 in) and, rarely, up to 6 m (20 ft) with rough grey-brown bark. Aphids cluster on the bottoms of young leaves, unopened flower buds and new stems. To get rid of the pests, the Connecticut Agricultural Experiment Station recommends spraying with azadirachtin, malathion, ultrafine horticultural oil or insecticidal soap. Plan the perfect garden with our interactive tool →, Connecticut Agricultural Experiment Station, University of Minnesota Extension: Aphids, University of Illinois Extension: Forsythia. The Connecticut Agricultural Experiment Station recommends spraying with acephate in early August only if you see many of the adults and your forsythia is severely damaged. Minimize the splash of soil bound spores by watering gently at the base of the plant. The young bugs hatch in mid-May and suck the sap out of the shrub's tender leaves. Maintain the plant’s vigor with regular watering, feeding and sterile pruning. Sign up to get all the latest gardening tips! When twigs, stems, and shoots suffer forsythia cold damage, their color changes and they look dry or wrinkled. Forsythia is photophilous, but grows in the shade. 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