You might see buds or young blossoms die back, along with die-back of green, growing tips. Just choose a spot in your yard that is away from small children and curious pets. Oleanders in Southern California were first diagnosed with the diease in the early 90’s and it was just a matter of time before it spread to Arizona. If the infection is severe, apply a copper fungicide or a Bordeaux mixture in autumn. These small insects (1/4 inch long) become carriers of the disease when they feed upon an infected oleander. Oleander. Thereafter, they spread it to every other oleander they feed upon. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Water oleander bushes carefully at the base of the plant to keep the foliage dry. An oleander bush might also develop one of several fungal disorders, each with its own set of identifiable symptoms. Avoid watering with sprinklers, which can spread the pathogens to uninfected plants. As far as oleander diseases go, oleander knot diseases aren’t the worst. Prune infected plant parts, but only when the foliage – and the weather – is dry. In fact, although it can cause plant dieback, oleander knot generally doesn’t result in long-term damage or death of the plant. The disease is widespread in Arizona and other areas where oleander plants are popular. Dark, soft spots called cankers can also appear on the plant's stems. Oleanders that for years have provided shade, sound barriers and pleasant views to the people of Phoenix are now dying because of a oleander disease and insects. Do this during dry weather, when re-infection is less likely. Oleander (Nerium oleander) is a fast-growing evergreen shrub that's hardy and fairly low-maintenance.In fact, because of its hardiness, the plant is considered invasive in certain parts of the Southwest and around the Gulf Coast. Overhead watering is especially risky after pruning an oleander. Hardest hit are the oleanders in the Phoenix area between 7th Avenue and 7th Street and northward from Camelback Road. Contact with the plant can also cause skin irritation, so wear gloves when working on the plant. Oleander is a beautiful shrub that blooms all summer long.. Summary of key Oleander facts. You can help prevent this by cleaning tools as you work, wiping them with alcohol or household bleach, but wear gloves to protect your skin. All Rights Reserved. Treat the pruned area with a 10 percent bleach solution to prevent entry of the bacteria. Oleander knot is the result of a type of bacteria (Pseudomonas syringae pv. Oleander is a dense, fast-growing evergreen shrub that has been growing since ancient times and is native to North Africa and the eastern Mediterranean regions. Oleander leaf scorch is caused by growth of a bacterium called Xylella fastidiosa; this organism causes leaves to turn yellow and droop, with leaf margins eventually turning brown. However, the warty galls cause unsightly, distorted growth. Oleander, however, is toxic to humans and pets, every part of it, and the outcome of ingesting even a small amount of it can be dire. The disease also spreads on tools used to cut flowers or to prune away affected stems. If oleander knot disease has afflicted your oleander plant, read on to learn about treating the disease, also known as nerium canker. A severe problem might cause some leaves to fall; if you see this happen, prune off affected branches by cutting into healthy wood behind the problem area, disposing of cuttings as you work. Remove affected stems by pruning them off as soon as they appear, to help prevent further spread of the problem. Oleanders in Southern California were first diagnosed with the diease in the early 90’s and it was just a matter of time before it spread to Arizona. Oleander leaf scorch is caused by growth of a bacterium called Xylella fastidiosa; this organism causes leaves to turn yellow and droop, with leaf margins eventually turning brown.These leaves eventually die and the disease can spread from branch to branch, especially during warm weather. Oleander is a dense, fast-growing evergreen shrub that has been growing since ancient times and is native to North Africa and the eastern Mediterranean regions. It produces fragrant, showy clusters of flowers from around May to October, coming in several color varieties. Oleanders that for years have provided shade, sound barriers and pleasant views to the people of Phoenix are now dying because of a oleander disease and insects. These leaves eventually die and the disease can spread from branch to branch, especially during warm weather. It also spreads by contact with contaminated water, infected garden tools, or even human hands. If oleander knot disease has afflicted your oleander plant, read on to learn about treating the disease, also known as nerium canker. As the name suggests, spots appear on the plant's leaves, sometimes as yellow or brown patches that can be small or cover a large part of the leaf. No effective controls exist for this disease, but if symptoms only appear on leaves and buds and affected parts are removed, the plant should recover; a severe problem that includes main stems might kill the shrub. By: Mary H. Dyer, Credentialed Garden Writer. Her work has appeared in health, medical and scientific publications such as Endocrinology and Journal of Cell Biology. Savastanoi) that enters the oleander plant through wounds and injured or scarred areas. When pruning an oleander, always remove cuttings from the area immediately, even if there's no evidence of disease, to help prevent fungal growth or spread of any problem that's not obvious. She has also published in hobbyist offerings such as The Hobstarand The Bagpiper. Growing plants is usually an enjoyable and rewarding hobby, but it can be quite discouraging when a tough, generally trouble-free shrub such as an oleander (_Nerium oleander develops a problem that interferes with its growth or flowering. Keeping foliage dry by watering at the plant's base also helps control this problem, as does watering early in the day so foliage dries quickly. An African native, oleander grows in U.S. Department of Agriculture plant hardiness zones 8 through 10, covering itself in showy, colorful flowers in summer. Symptoms resemble those of lack of water, but only affect some branches, helping distinguish it from problems arising during drought that affect the entire plant. Growing plants is usually an enjoyable and rewarding hobby, but it can be quite discouraging when a tough, generally trouble-free shrub such as an oleander (Nerium oleander) develops a problem that interferes with its growth or flowering. 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