Many gardeners complain that in early summer raspberries are yellowing leaves. This mainly occurs during the ripening period of berries. First, the leaves begin to fade, and then the stems with the fruits dry up. It is important to solve the problem in time to save the harvest. There are several reasons why the leaves turn yellow in raspberry. Depending on the type of disease, a specific method of fighting the virus should be used.
Gardeners often write off the deterioration of plants for a summer drought or lack of nutrients. Of course, such reasons can also be, but with a lack of moisture raspberries wilt, the leaves burn, but do not turn yellow and do not fall off. Some craftsmen offer to spray sick bushes with potassium permanganate, but this strong oxidizer is unlikely to be able to help, and the soil contains enough manganese.
If the leaves turn yellow at the beginning of the raspberry, the new stems grow short, and then the bush dies at all, then the plant suffers from root cancers. In this case, it remains only to uproot all plantations, and at this point do not plant berry crops for about 15 years. The reason why the leaves turn yellow in raspberry can be more innocuous. For example, in the middle of summer it dries up due to excessively dense plantations. Poor aeration and illumination negatively affects the condition of plants.
For raspberries, a virus such as wilt is dangerous. The sign of vertical wilt is the gradual withering of shoots along with berries, which acquire a violet-bluish color. The reservoir of the virus is considered to be solanaceous cultures, for this reason near the raspberries one can not plant potatoes, seedlings of eggplants and tomatoes. Especially rapidly the disease progresses on wetlands. Another reason why the leaves turn yellow in raspberry, may be unsatisfactory care for the plantations. Every year, the earth needs to be dug up and fed up. As fertilizer, you can use chicken droppings, compost and humus.
A fairly common disease is purple spotting or didymella. Many gardeners are wondering why spring raspberry leaves turn yellow, not suggesting that it is infected with a fungus. In mid-June, red-violet spots appear on young shoots, which eventually grow and cover the entire bush. In autumn, most shoots die, and the rest very badly endure the winter. The disease develops due to a rainy and warm spring, as well as a winter with frequent thaws.
If the answer to the question, why the leaves turn yellow, is found, it is necessary to begin to combat the problem. First of all, you need to buy only a proven and healthy planting material. It is recommended to choose varieties that show resistance to the virus, such as Skromnitsa, Kuzmina News, Balsam, Scarlet Sail, Bryansk. It is necessary to prune the bushes in time, tie them to the trellis for ventilation. All stained shoots should be cut without delay. In the period of bud budding, the growth of young shoots, before the flowering and after the fruiting raspberry can be sprayed 1% boron liquid. Such methods of fighting the virus will help to stop the development of the disease and save plants from death.