Many gardeners complain that yellowing of leaves is observed in raspberries in early summer. This mainly occurs during the ripening period of the berries. First, the plants begin to fade the leaves, and then the stems dry out along with the fruits. It is important to solve the problem in time to save the crop. There are several reasons why raspberry leaves turn yellow . Depending on the type of disease, a specific method of combating the virus should be used.
Gardeners often attribute the deterioration of plants to summer drought or lack of nutrients. Of course, such reasons can also be, but with a lack of moisture, raspberries wilt, leaves burn up, but do not turn yellow and do not fall. Some craftsmen suggest spraying sick bushes with potassium permanganate, but this strong oxidizing agent is unlikely to help, and the soil contains a sufficient amount of manganese.
If the raspberry leaves turn yellow at first, the new stems grow short, and then the bush dies completely, then the plant suffers from root cancer. In this case, it remains only to uproot all the plantings, and in this place do not plant berry crops for about 15 years. The reason why raspberry leaves turn yellow may be more harmless. For example, in the middle of summer, it dries out due to excessively dense plantations. Poor aeration and illumination negatively affects the condition of plants.
For raspberries, a virus such as wilt is dangerous. A sign of
verticillous wilting is the gradual withering of shoots along with berries that acquire a lilac-bluish color. Solanaceous crops are considered to be the virus reserve, for this reason it is impossible to plant potatoes,
seedlings of eggplant and tomatoes near raspberries. Especially quickly the disease progresses on waterlogged soils. Another reason why raspberry leaves turn yellow can be poor maintenance. The earth needs to be dug up annually, to make top dressing. As fertilizer, you can use
chicken droppings, compost and humus.
A fairly common disease is purple spotting or didimella. Many gardeners are wondering why raspberry leaves turn yellow in the spring, without suggesting that it is infected with a fungus. In mid-June, red-violet spots appear on young shoots, which over time grow and cover the entire bush. In the fall, most shoots die off, and the remaining very poorly tolerate winter. The disease develops due to a rainy and warm spring, as well as winter with frequent thaws.
If the answer to the question why the leaves of raspberries turn yellow is found, it is necessary to begin to combat the problem. First of all, you need to buy only proven and healthy planting material. It is recommended to choose varieties that are resistant to the virus, such as Skromnitsa, Novosti Kuzmina, Balsam, Scarlet sail, Bryansk. It is time to trim the bushes, tie them to the trellis for ventilation. All stained shoots should be cut off immediately. During budding, growth of young shoots, before flowering and after fruiting, raspberries can be sprayed with 1% boron fluid. Such methods of combating the virus will help stop the development of the disease and save the plants from death.