Like any other fruiting shrubs, raspberries prone to disease. Most often they are accompanied by yellowing, twisting and leaf fall. It is possible to relieve raspberries from illnesses not only by timely treatment, but also by the prevention of diseases. Equally important is the right care for her.
Raspberry leaves turn yellow: reasons
Raspberry leaves may turn yellow for different reasons. Bacterial, viral diseases and pests disrupt the normal development of the plant, changing the color of the leaf surface. That is why you need to carefully monitor the condition of the shoots and leaves. It may indicate the onset of the disease.
Yellow leaves on raspberries: what to do?
First you need to figure out what causes yellowing. One of the most dangerous diseases is root cancer. To understand that raspberries are sick of them is quite simple - characteristic swellings form on the roots, berries lose their taste, new shoots grow abnormally short. This bacterial disease most often affects perennial raspberry plantations. To treat the plant with chemicals in this case is impossible. Affected bushes should be excavated and burned. It is worth considering that the place where the infected raspberries grew was not suitable for planting new bushes for 8 years.
In order for raspberry on the site not to get sick with root cancer, the following rules should be followed:
- It is better to plant new bushes on a plot where legumes and grain used to grow
- Try to remove weeds in time.
- Do not pour the soil, do not allow the formation of a crust on it
- When transplanting old bushes carefully inspect the roots, process them before planting with copper sulfate solution
- Apply to the ground rotted manure, potash and phosphate fertilizers
Yellow leaves on raspberries can talk about chlorosis. This viral disease begins with a gradual yellowing, which eventually covers the entire leaf. Chlorosis does not affect the veins. They remain green. Secondary signs of the disease can be weak shoot growth and the formation of dry berries.
If you find the signs of chlorosis described above on raspberry bushes, then you first need to determine what caused the development of the disease. It is provoked by high acidity and soil moisture. Virus can spread and sucking pests like aphids.
The acidity of the soil is reduced by gypsum - 120 g per 1 sq. M. m., and excessive humidity - by limiting irrigation, using warm water, including from open water bodies. You can fight pests with any insecticide.
Prevention of chlorosis raspberry:
- Timely removal of diseased bushes
- Soil loosening and fertilization: peat, compost 1 time in 2 years, 5 kg. On 1 square. m
- Soil moisture control
- Preventive watering solution of bird droppings
- To improve the condition of raspberries with chlorosis can be nitrogen and potash fertilizers, humus, compost.
Raspberry leaves dry: treatment features
Another important problem is that raspberry leaves dry. This result is most often caused by a fungal disease called rust. At the very beginning of the disease, in May, dark spots with spores are formed on the underside of the leaves, then the leaves begin to dry and fall off. On the stems of the shoots, you can find brown ulcers. The way to fight the disease is the destruction of diseased bushes. In spring and autumn raspberries are treated with a 1% solution of Bordeaux mixture.
Raspberry Rust Prevention:
- Destruction of fallen leaves
- Fertilizing soil in spring with manure
- Planting rust-resistant raspberry varieties (Russian, Evergreen, Progress, Yellow Spirina)
Raspberry leaves curled
Deformation of the leaves may indicate not only the disease of raspberry, but also the lack of trace elements. Often leaves curl around the plant due to insufficient boron. In this case, in early summer, the soil is fertilized with a solution of boric acid. In 10 l. water add 5 g of substance. With a shortage of potassium, raspberry leaves are curved downwards. From potassium fasting helps feeding ash.
The shrub leaves often curl and because of anthracnose. The fungus causes gray spots with a purple rim, twisting and drying of the leaves. Berries do not have time to ripen. They are deformed and turn brown. With a strong infection, the bushes are sprayed with a 1% solution of Bordeaux mixture. Sick branches are cut and burned.
What is useful raspberry leaves?
Probably for most people, raspberry jam is the best way to fight a cold. No less effective for reducing heat and raspberry leaves. They contain a huge amount of useful substances: vitamin C, salts, organic acids ... A decoction or tea from this healing raw material is a natural antibiotic. Still raspberry leaves are useful for their astringents. They contribute to the rapid stop of bleeding. Use the leaves and for the preparation of expectorant concoctions, drinks to enhance immunity and combat intestinal upset.
For the preparation of 2 tablespoons of dry leaves pour 2 tbsp. boiling water and infuse for 2 hours.
A situation where raspberry leaves dry and turn yellow can be prevented. To do this, the soil should be protected from waterlogging, destroy diseased bushes, timely and properly feed the plants. Particular attention should be paid to the quality of bushes purchased for planting. Many raspberry diseases occur precisely because of the sick seedlings.