Why Is My Forsythia Bush Wilting? Also prune out obviously dead (brittle, no green if you scratch the bark off.) - I have a new forsythia bush this year. Yellowing forsythia bushes are normal before fall leaf drop but during the growing season it’s time for action. The form varies depending on the variety. Forsythia grows at a rate of about 30cm / 1ft per year when established. Forsythia (Forsythia spp.) Forsythia x intermedia 'Meadowlark' grows around 7 to 10 feet tall with a similar spread. It sports larger flowers than most forsythia bushes at roughly an inch across. Galls on forsythia caused by Phomopsis have diameters of about 1 to 2 inches, a bumpy or rough texture and are mostly spherical. White Forsythia. Q. The yellow-green fourlined plant bug has four black stripes alternating with three green stripes on its wings. Q: I am having a problem with two shrubs — forsythia and Knockout Roses. The fourlined plant bug (Poecilocapsus lineatus) and the tarnished plant bug (Lygus lineolaris) lay eggs in the forsythia's soft stems. Is this a pest or disease and how ... Q. Forsythia Shrub Dying - My forsythia bush looks like it is dying. What can I do to help it? Maintaining a healthy plant through regular watering, fertilization, pruning and mulching can help minimize the damage from fungal disease. Twig blight (Sclerotinia) of branch tips. If, however, the foliage is wilted, spotted or in any way less than robust, your plants are likely to be suffering from a pest, disease, nutrient deficiency or other problem. Further details on aphids A lot of fertilisers should not be used as it might destroy the plant. Q. Lanceolate, acute with apicular gland, toothed on the upper half, medium to dark green above, lighter below, glabrous. Forsythia leaf problems will not usually kill the plant, but due to its ornamental function, the disease can mar the beauty and dim the plant’s vigor. Aphids are a common, but rarely fatal, problem for young forsythias. A forsythia with yellow leaves may be occurring due to any number of diseases… Forsythia through the seasons: early spring (L), late spring (LC), summer (C), fall (RC), and winter (R). 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. Leaf Description: Opposite, simple, medium to dark green leaves; 3-5 in. Yellow leaves on forsythia occur from a variety of diseases, most of which can trace the vector to grafting or mechanical introduction, although disturbed soils may harbor spores for years. Insects, Diseases, and Other Plant Problems: Although deer resistant, this plant is occasionally damaged by deer. By: Bonnie L. Grant, Certified Urban Agriculturist. The weevil, which comes in varying shades of brown, has faint white lines on its wing covers and whitish spots on its rear. Sometimes the leaves turn yellow, gold, or purplish in the autumn but fall color is usually poor. long; green to yellowish green fall color, sometimes purplish; holds late into fall. Maintain the plant’s vigor with regular watering, feeding and sterile pruning. Some susceptibility to leaf spot and crown gall. In autumn, the green leaves of forsythia become golden or purple-violet, and again it attracts attention with its bright, mottled flame. Black Sclerotinia sclerotium (overwintering structure) in the pith. The next year, in early spring, use a fungicide spray to prevent future occurrences. If the aphid population on your forsythia is not out of control, the University of Minnesota Extension recommends letting the bugs' natural enemies, such as parasitic wasps, ladybugs and green lacewings, control them. The young bugs hatch in mid-May and suck the sap out of the shrub's tender leaves. 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. I think you have two problems-one is that you aren’t pruning correctly, and two, I think you have a disease known as Phomopsis galls. Leaves on one or more branches wilt, turn brown and die Bark on infected branches is darker, cracked, or blistered at the site of the canker Wood beneath the canker is dark brown Common on shrubs stressed by drought, winter injury and other factors This is usually just at leaf formation. are non-native shrubs grown for their yellow flowers that bloom in early spring.They are easy plants to grow because of their adaptability. If you wait until the fall to do the job, you will reduce the number of flowers that you will get the following spring. ... Forsythia has few pest problems, and is not favored by deer or Japanese beetle. Forsythias are hardy, attractive bushes which delight us every spring with their early, golden blooms. Forsythia blooms on old wood and they set their flower buds soon after the new growth appears each year. You want to regenerate the plant from that crown base. 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. When leaves are uniformly green, open, upright and growing vigorously, your plants are well-cared for and healthy. It is not known exactly what organisms cause the galls to form but it is suspected that the ones near soil level may be caused by the soil borne bacterium called Agrobacterium tumefaciens while those further up the stem may be caused by a fungus in the Phomopsis genus. Fungal spores can often live in soil for a long time and even overwinter there, bursting into infectious displays at the first sign of favorable weather. For example, your shrub might be infected by a foliar disease if it has blotchy brown spots on its leaf veins. Pests include aphids, tarnished plant bug, Japanese weevil, and nematodes. The most common problems are planting them in too small a space or deciding that they should make a tidy, square hedge. Leaf problems, like discoloration or wilting, are a telling sign of a forsythia in trouble. Bright, one-inch yellow flowers have a slight green tinge and appear a few weeks after other forsythia. These bugs have soft, pear-shaped bodies that can be brown, gray, yellow, black, green or red. It grows 8 to 10 feet tall and 10 to 12 feet wide. Minimize the splash of soil bound spores by watering gently at the base of the plant. Have treated with triazole fungicides without much success. It … Forsythia x intermedia 'Kolgold' matures at around 4 to 5 feet in height and spread. Managing Pests and Disease. There are several fungal diseases that may be plaguing yellowing forsythia bushes. 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