Oleander Diseases

Written by nicole crawford
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Oleander Diseases
The oleander plant is susceptible to a variety of diseases. (Photos.com/Photos.com/Getty Images)

The oleander is a perennial flowering shrub with beautiful flowers and long, leathery leaves. They are low maintenance when planted in the right conditions. The entire plant is poisonous, so be cautious with pets and small children. In addition to a variety of pest problems, such as scales, oleander caterpillars and spider mites, oleander is susceptible to certain plant diseases.

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Botryosphaeria Dieback

The oleander is a perennial flowering shrub with beautiful flowers and long, leathery leaves. They are low maintenance when planted in the right conditions. The entire plant is poisonous, so be cautious with pets and small children. In addition to a variety of pest problems, such as scales, oleander caterpillars and spider mites, oleander is susceptible to certain plant diseases.

Bacterial Gall

Bacterial gall is caused by the Pseudomonas syringae bacteria, which enters through wounds in the plant surface. Bacterial gall commonly follows freeze damage. It causes knots to develop on bark, flowers and plant leaves. The bacteria spreads by water, tools or hands, so sanitise all tools that have touched affected areas. Prune the infected areas at least 12 inches below the site and avoid overhead watering to prevent recurrences.

Oleander Leaf Scorch

Oleander leaf scorch can kill oleander plants within 2 years if left untreated. Initial symptoms include yellowing of leaves, leaf scorch, and twig and branch die back. The disease is caused by the Xylella fastidiosa, which is specific to oleander plants. It is particularly common in California, where it was first discovered in the 1990s, as well as in Arizona and Texas. The disease spreads by the glassy-winged sharpshooter, a common garden pest in the Southern United States.

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