Consult with an expert if you suspect that your oleanders are infected. X-Disease This cherry tree disease causes slow or quick decline of your tree. You’ll notice that your tree takes on a red hue on the bark and leaves, and the fruit can have incomplete color. Background: Although the oleander plant is practically ubiquitous throughout the Mediterranean area, very few publications refer to its cutaneous toxicity. It’ll also mature far later, and the limbs will eventually go through dieback before it kills the tree. Cherry tree diseases come in several forms, but cankers are one of the easiest to spot. Savastanoi: Bacteria palm tree Palm diseases: various: Fungus pine Pitch canker: Fusarium circinatum: Fungus poplar Nerium oleander grows best in full sun and adapts to a wide range of soil types. 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. Personally, I have seen the disease affecting large, old oleanders in North Central Phoenix and in the Arcadia area. The only way to slow the spread of the disease is to destroy infected shrubs. Its ability to stand up to salt spray and drought is what makes it popular in coastal areas and very dry regions. Interactions Hardest hit are the oleanders in the Phoenix area between 7th Avenue and 7th Street and northward from Camelback Road. Heart disease: Don't use oleander to treat heart disease without the supervision of a healthcare professional. In cool climates where the oleander is not hardy, overwinter potted plants indoors. It can grow into a large shrub — some varieties up to about 20 feet — or a small tree, and tolerates hard pruning in spring to maintain its shape. The patients in question were twins who had oleander leaves applied directly to their face for 20minutes. Oleanders cannot outgrow the disease. Nerii: Bacteria oleander Oleander leaf scorch: Xylella fastidiosa: Bacteria olive tree Olive knot: Pseudomonas savastanoi pv. Initial signs of oleander leaf scorch . Oleander tolerates part shade, but in those conditions, it requires staking to prevent flopping and will need more frequent pruning. The disease can be spread through infected cuttings, so never propagate from symptomatic shrubs. Unlike some plants that have one toxic compound, the oleander has several, which can cause issues with the digestive tract and cardiovascular and nervous systems. It’s simply a matter of time before I will see it in outlying areas. oleander Oleander knot: Pseudomonas savastanoi pv. Pink oleander flowers. It's too dangerous to self-medicate. It's too dangerous to self-medicate. Patients and methods: Herein, we report two cases of irritant contact dermatitis caused by oleander. It is unlikely that OLS can be eradicated from California; the disease is already too widespread” (source).