Scale outbreaks can be triggered by pesticides used against other pests or by environmental stresses such as too much or too little water. Disinfect tools after use with household disinfectant or dip them in a solution of household bleach and water. It is a dense, rounded, deciduous shrub that typically grows to 6-10’ tall and may spread over time to as much as 12’ wide. Solving the problem is as easy as giving the plant a drink of water. You can find this at your local garden center. There are 3 shrubs, all planted at the same time (almost 2 yrs. Usually root systems rot, causing plants to topple over. Crown galls are abnormal tumor-like growths caused by a bacterium. They are covered with white waxy powder and adorned with short, soft spines around their edges. These shells, which may be white, yellow or brown to black, are only about 1/25 to 1/50 inch in diameter. Still, other types of weigela bushes have golden or lime-colored foliage. Clear dead leaves and canes out every year in the late summer so the fungus has no suitable medium to grow in. Brown Leaves on Weigela - Knowledgebase Question. According the University of Minnesota Extension (UVM), one way to identify this fungus is to look for "a scorched appearance" on leaf margins. Weigela shrubs are, in fact, one of the plants susceptible to the fungus Verticillium wilt. Apply the mulch around the base of your weigela plant in a layer that is 4–5 inches (10–13 cm) thick. Others make the mistake of cutting into root systems when working compost or manure into the soil. Disinfect garden tools in a solution of hot water and household bleach. Still, other types of weigela bushes have golden or lime-colored foliage. When you transplant a shrub from container to ground, it is necessary for the plant's root system to receive adequate water and that is generally achieved by either regular rainfall or hand watering/irrigation that provides about 1 inch of water a week. Reduce watering and weeding by adding a 2-3 inch layer of organic bark mulch around your plants. Heavily infected shrubs must be dug out and discarded in such a way as to prevent the spread of the infection. Saw the stems as close to the ground as you can. Root damage can also be caused by digging too close to your plant while cultivating. Reduce watering and weeding by adding a 2-3 inch layer of organic bark mulch around your plants. Leaves of affected shrubs turn straw yellow or brown and are thickly dotted with small black fruiting bodies. If twig blight is a common problem every year, prune and destroy affected plant parts in the early spring.For more information see file on Controlling Fungal DiseaseLeaves Turn Yellow, Drop Prematurely indicates Leaf SpotLeaf spot diseases caused by fungi occasionally attack weigela. Spray shrub foliage and stems with light, or "superior" horticultural oil. For more information see the file on Controlling Mealy BugsLeaves Discolored, Growth Stunted because of Root NematodesRoot nematodes are whitish, translucent, wormlike creatures less than 1/2 inches long. Emerging in spring, narrowly ovate, sage green leaves line the gracefully arching branches. The result is a stunted, knotted root system that is hard to water. When established, Weigela are moderately drought tolerant. It would seem to me that the leaves would be getting wet, but perhaps not the roots. Infested roots soon die, but the shrub struggles to form more roots above the invaded areas. Mulch. You may want to move this new plant to a fresh spot and see what happens. I just planted some Weigela Variegated shrubs this past week and already they are getting brown leaves. Heavy infestations require spraying. Black walnut trees (Juglans nigra) produce a toxic substance (called juglone) that prevents many plants from growing under or near them. Good sanitation will help avoid the problem. Fertilize Spray bark surfaces with heavy (Volck) horticultural oil in late winter while the shrub is dormant to kill over wintering eggs. Sizes range from 6 to 9 feet high and 9 to 12 feet wide to dwarf forms only 2 to 3 feet high. Avoid this by using a slow-release nitrogen fertilizer.Handle mild scale infestations by simply scraping the telltale bumps off plant surfaces with a fingernail, or a cotton swab dipped in rubbing alcohol. Use an anti-transpirant leaf spray on the shrubs in early spring to prevent leaf spot. Learn what you need to know to grow and care for weigela. The best way to prevent or minimize leaf-wilt is to choose the right time to transplant. Weigela are excellent landscape plants and work well in perennial and flower gardens as well. If you do not see scorched leaf margins on your plant and have no reason to believe that root damage has occurred, you're lucky. It attracts bees and hummingbirds and resists deer and rabbits. Remove and destroy dead leaves, flowers and dead plants. Large infestations of mealybugs can stunt plant growth and cause leaves to drop prematurely. Flooding a root system with water when that system is incapable of absorbing the water is, at best, useless and, at worst, counterproductive. Fertilizing would foster extra leaf growth, which you do not want, since the weigela shrubs' disturbed roots are already struggling to support the current amount of foliage. Use a soaker hose or drip system to make watering easier. Ends of Branches Die Back means FrostAlthough Weigelas are generally hardy in areas where winter temperatures may dip as low as 0° F, the tender tips of their branches suffer frostbite at these temperatures and die back. Czechmark Trilogy from Proven Winners is heavier blooming than a typical weigela, with flowers that contain three colors at once: white, pink, and red. They are adorned with creamy-white edges, some pink flushing, all with a fine pink ribbon along their edges. Key Points. Why Are My Houseplant's Leaves Turning Brown? Introducing "One Thing": A New Video Series, Root damage due to transplant shock or other causes. A light tan discoloration of the stem can be seen in cross section. Severely infested plants are unsightly, and they do not grow well. Mealybugs chew on the weigela's leaves, draining their sap. Conditions such as high winds simply exacerbate the problem: they have a drying effect that further robs the leaves of moisture. According the University of Minnesota Extension (UVM), one way to identify this fungus is to look for "a scorched appearance" on leaf margins. Locate 2-3 branches that are growing next to the main stem and use a hand-held pruning saw to cut the stems upward at a 45-degree angle. Keep in mind that plants in containers dry out faster than in the ground. Prune back to a healthy set of lateral shoots, which will allow for … The first sign of a scale attack is often discoloration of upper leaf surfaces, followed by leaf drop, reduced growth, and stunted shrubs. If you have newly transplanted weigela shrubs suffering from leaf-wilt, it is important to realize that there may be more than one cause. Likewise, weigela can adapt to just about any soil type, but it needs soil that is well-draining. Prune to increase air circulation around shrubs, taking care to sterilize pruning tools by dipping them in household bleach to prevent the disease from spreading. Name: Richard Gaddis Poughkeepsie, NY. It would seem to me that the leaves would be getting wet, but perhaps not the roots. The disease occurs worldwide. Avoid over watering. Shrubs over 5 years old are usually not seriously affected. The new weigela selections fall into every size category, from one that's perfect for pots to one that can create a hedge (like Fine Wine weigela, above). Midnight Wine (Elvera) also has burgundy-purple leaves. Best of all, weigela is bulletproof — easy to grow and pretty tough. Overwatering itself can damage plant roots. 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; More information on Botryosphaeria Canker The leaves of many of these species are fitted with jointlike growths called pulvini, which allow the leaves or leaflets to wilt in response to darkness and temperature. Reduce watering and weeding by adding a 2-3 inch layer of organic bark mulch around your plants. Remove and discard the infected shrub, or cut away affected plant parts with a clean, sharp knife or razor blade. The fungus Verticillium is found in the soil. UPDATED 6 ... Another possible cause of leaf-wilt on weigela is soil fungus. 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