We planted it 12 years ago, and for the first couple of years the lemons were normal sized and very juicy, with very large crops. The tree is planted on the south side of our lot beside the lawn, so it gets plenty of sun, water and fertilizer. Why are my Eureka lemons so huge with thick rinds? Often the insides are dried out by the end of May. However, yellow oleander is more cold-sensitive and, in general, less robust than common oleander. Yellow oleander (Thevetia peruviana), with butter yellow blooms, has taken the place of the diseased red, pink and white flowering oleanders in some areas. Italian buckthorn is a lush, drought tolerant evergreen with luminous foliage that is more cold tolerant than oleander. In terms of size, Italian buckthorn (Rhamnus alaternus) has been suggested as an oleander alternative, as it grows into a plant of similar dimensions. A program for selection and breeding of OLS-resistant varieties makes sense, as some oleanders, such as ‘Petite Pink’ and ‘Petite Salmon’ seem less disease-prone than others. It is not easy to find a comparable replacement for oleander, which flowers heavily in red, pink, white or salmon for many months on little, if any, water. Bacteria that take up residence in a leafhopper’s saliva continue to do so for the rest of the insect’s life. Thus, in sucking sap from the plant, the leafhopper ingests bacteria that multiply in its saliva and then are passed along to neighboring oleanders when the insect visits them to feed. The bacterium involved lives in the water-conducting xylem tissue of the plant. The sharpshooter is identifiable by its wings, which rest tent-like upon its back, and its movements, which consist of brusque, quicker-than-lightning hops. The vector for dissemination of OLS is a 1/2-inch-long, glassy-winged sharpshooter insect - a kind of leafhopper. It may be wiser, in fact, to destroy affected plants because the disease is easily spread. It has been said that watering and fertilizing diseased oleanders can extend their life, but this has not been clearly demonstrated. In the case of OLS, shoots on only one part of the plant initially turn brown. There is no cure for this bacterial disease, whose symptoms appear, at first glance, to be a sign of insufficient moisture.Ī plant lacking water will have distressed shoots throughout its foliar canopy. Your oleanders (Nerium oleander) have fallen victim to oleander leaf scorch, or OLS for short. Is there something we can do to save them? I have noticed many in our neighborhood in the same condition.
The oleanders on our hill are turning brown. ‘Petite Salmon’ oleander has demonstrated some resistance to oleander leaf scorch
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