Similarly, there are some easy ways to diagnose diseases on shrubs and hedges to ensure the right method is used. For this reason Japanese pieris is not recommended if children play in your yard, or family pets roam the yard. My pieris "flaming silver" young red leaves and new shoots turned brown completely after transplanted into flower bed from pot last week. Like rhododendron, it contains grayanotoxins whose ingestion can be fatal. Excessive heat is another common cause of brown leaves. If the shrub is infected, dispose of the leaves away from any other shrubs. It doesn't seem to help, more of the leaves have turned brown and they still look droopy. The leaves of your shrub may turn brown and dry if your shrub has been over-fertilized. Their nymphs are spiny and darker than the adults. Most healthy shrubs can tolerate a few dead leaves and will resist a fungal pathogen. Fortunately, there are steps you can take to help your shrub fight off these pathogens and stay healthy. suggestions ? 25 Mar, 2012 . I have a pieris japonica that has leaves turning brown on the ends. If you suspect phytophthora, look for reddish-brown cankers at the base of the branches. There are several environmental factor that can lead to shrubs turning brown. The most common is Japanese pieris (Pieris japonica) and it’s many associated cultivars. i had a little look up and found a site where it says that young red leaves slowly turn chesnut brown, this could be it but cant say for sure, sorry. Any help you can give me will be most appreciated. Moon_grower . Over the past couple of days, most of the new red leaves on my pieris have suddenly turned brown and limp. She's published numerous articles online and two of her edited manuscripts have been contracted and published by Random House. This pathogen leaves brown spots on the leaves and may travel to the stems, branches and flowers of your shrub. Mountain pieris (Pieris floribunda) is native to North America and is more pest-resistant but somewhat less showy. Green leaves look ok. Also Azalea flowers and buds become brown too at the same time. Apply 1 to 2 pints of diluted spray for a young shrub and up to 3 gallons for a large shrub. The best way to handle disease is to prevent it. When lace bugs feed on Pieris japonica’s leaves, they leave what looks like bleached spots … Spray the shrub in the spring as the new leaves emerge. Shawna Kennedy has been writing and editing professionally since 2004. The wings are transparent with a broad black X-shaped marking Over-watering causes the root development to slow so they aren't able to absorb enough water to nourish the plant. Needs watering? © Copyright 2020 Hearst Communications, Inc. Pieris japonica does not like full sun exposure, and grows best in partial shade conditions. This pathogen leaves brown spots on the leaves and may travel to the stems, branches and flowers of your shrub. Lilacs and forsythia are particularly susceptible to bacteria. Spray again one to two weeks later. The heat reduces the ability of the plant to draw water into its leaves, resulting in the leaves dying. Fungicide is necessary only if your shrub is already stressed by drought, insect invasion or some other environmental factor. Premature leaves turning brown indication of a problem with your shrub; they can lead to entire shrubs turning brown. Remove all dead leaves and fruit from the shrub. Prune branches in dry, warm weather, to promote good air circulation. Avoid excessive watering and water at ground level to keep the leaves dry. This shrub needs well-drained, acidic soil. The common application is 8 ounces per 1,000 square feet. 24 Mar, 2012; Answers. Similarly, there some species of fungi and bacteria that can cause small brown spots on the leaves, which can spread until the whole leaf dies. The fungus spreads by moving water, so avoid overhead irrigation when possible. These tiny, flightless bugs have lacy wings, are about 1/8 of an inch long and white to pale brown in color. Piercing insects may introduce bacteria to your shrub. Too much water will create the same problem. Catty4667 . Leaves that turn yellow between the veins may be a sign of alkaline soil. My Crepe Myrtle Is Turning Yellow & Wilting, Diseases of Compact English Laurel Shrubs, University of Illinois: Bacterial Disease, Virginia Tech Cooperative Extension: Shrubs- Functions, Planting and Maintenance, University of Connecticut: Leaf Spot Disease of Trees and Shrubs, Ohio State University: Bacterial Diseases of Plants, Clemson University: Viburnum Diseases and Insects, The Leaves of My Otto Luyken Laurel Are Turning Brown. The leaves, flowers and secondary products (honey) of Japanese pieris is highly toxic to humans, pets, and other domestic animals. The phytophthora fungus causes whole branches to wither and die and a general decline of the Pieris japonica. Many fungi remain dormant through the winter in fallen leaves or in any fruit or berry left on the shrub. Disease might not be the culprit. Azalea is next to my pieris and it has been there before I moved here last spring.