2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The Stecklenberg cherry virosis causes a significant slowdown in shoot growth in mature cherry trees. Infected trees form rosettes of narrow leaves with thickened skin. At the same time, the undersides of the leaves acquire an oily sheen, and their edges are bent. In cherry trees affected by virosis, flower buds often die off in spring. In addition to cherries, viros sometimes also affects sweet cherries
A few words about the disease
When infected with such a scourge as the Steklenberg cherry virosis, rings of yellow or light green color are formed on young cherry leaves. A similar "ornament" is preserved on the leaves until the very leaf fall. In some cases, the affected areas of the leaves may die off, and brownish necrotic specks may begin to form on them. In addition, enotia appears on some leaves - this is the name for the growths characteristic of viros.
It happens that this ailment occurs in cherries without any accompanying symptoms, it is just that the trees die prematurely.
The Steklenberg virosis is caused by a virus, the vital activity of which takes place in the cells of living organisms. Its distribution occurs with the sap of infected vegetation, as well as parasitic herbivorous mites and through attacks of sucking insects (most often aphids). Infection can also occur when infected cuttings are grafted onto healthy trees and when the tools used in the garden are not disinfected during pruning of various crops. The incubation period (from infection to the detection of the first signs of an illness) for the development of this scourge can range from two and sometimes even up to ten months.
How to fight
When planting cherry trees, it is advisable to purchase only healthy planting material. In order to prevent the Stecklenberg virosis from spreading, it is necessary to carry out systematic treatments against harmful sucking insects. Compliance with quarantine measures and good agricultural technology will also not be superfluous. And competent soil cultivation will help ensure good aeration, the result of which will be the creation of conditions less favorable for the development of the virus.
Before the buds begin to bloom, the trees are sprayed with a nitrafen solution, having previously collected all the fallen leaves and removing the affected branches. Before flowering, and then and after it, it is advisable to treat all plantings with Bordeaux liquid (one percent). You can also carry out the treatment with colloidal sulfur (35%) or copper oxychloride.
Cherry trees showing signs of virosis should be uprooted and burned immediately. And in no case should new ones be planted near infected gardens, since insects often carry the harmful virus. Also, when choosing a place for laying out a garden, one should take into account the crops that preceded the planted cherry, which previously grew on the selected site.
Trees planted in the garden should be examined periodically for Stecklenberg virosis. This should be done especially carefully in the first and second year after they have been planted. This will allow the identification of infected plants and timely removal of them before they become a source of infection for their neighbors.
In the fall, before the foliage begins to fall off, it is recommended to spray the trees with urea (400 g). Fallen leaves are often treated with the same remedy in the spring. You should also periodically dig up the soil in the near-trunk circles.
Before treating cherry trees with various pesticides, you should carefully read the contents of the instructions.
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