The sudden yellowing of the foliage of a raspberry bush makes gardeners wary. This phenomenon indicates a number of errors in the care of the crop or exposure to dangerous infections. To understand why raspberry leaves turn yellow, you need to familiarize yourself with the main diseases and predisposing factors that cause the problem.
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Possible reasons
The appearance of a yellow leaf color at the end of the fruiting period is a natural process. But if the problem develops in the springtime, drastic measures need to be taken.
In most cases, the foliage surface is covered with yellow spots due to lack of nutrients in the soil or prolonged drought. To exclude the lack of any substances, it is necessary to provide raspberries with abundant watering and feeding with nitrogen-containing compounds. In early spring, gardeners add ammonium sulfate to the site, guided by the calculation of 40-50 g of substance per 1 sq. m, or ammonium nitrate - 20-30 g of top dressing per 1 m2. Other causes of yellow leaves include all sorts of diseases or parasite attacks.
Root cancer is especially dangerous for the raspberry tree. The bacterium acts on the roots and develops with the following predisposing factors:
- Increased soil alkalinity.
- Drought.
- Long-term growth of raspberries in one place without replanting.
If wounds appear on the root system, infections and bacteria quickly enter the healthy parts of the plant. As a result, growths are formed on the roots with a diameter of 10-12 cm. They do not have a pronounced shape, have a soft structure and a light shade, but soon begin to thicken and become dark. Under the influence of neoplasms, the roots are no longer saturated with moisture and nutrients, which worsens the yield of raspberries and increases the risk of their death.
Faced with yellow leaves, shortening shoots or deterioration in the palatability of fruits, it is necessary to check the root system for the presence of various formations. If they are present, you should perform the following actions:
- Remove affected plants and burn them away from the main raspberry tree.
- In the place where diseased crops grow, do not plant anything for 2-4 years, so that all infections are destroyed.
To avoid the penetration of bacteria into the territory of the raspberry tree, before planting the seedlings, the substrate should be treated with copper sulfate. It is prepared from 100 g of a substance diluted in a bucket of water. Also, the roots are immersed in the composition for 5-10 minutes before planting in open ground.
Rust and chlorosis
Raspberry bushes are often exposed to rust. This fungal disease impairs the quality of the crop and winter hardiness. The problem develops against the background of high humidity during prolonged heat.
The disease is accompanied by the appearance of light red pads on the front of the leaves. The culture worsens immunity, and the foliage begins to turn yellow and fall off. Soon, the pads break apart and the spores spread throughout the garden.
At the end of the summer season, the lower part of the leaf plates is covered with a dark bloom. If you notice these symptoms, do the following immediately:
- Treat the plant with fungicidal preparations. It is allowed to repeat the action up to 4 times.
- Spray Bordeaux mixture (3%), potassium salt (2%), and ammonium sulfate until buds appear.
- All damaged branches should be cut and burned away from bushes. Cover the soil with a layer of mulch.
With the progression of chlorosis, the leaves quickly change color, dry out and fall off. Initially, they become covered with yellow spots at the veins, and then acquire a pale shade and dry out at the edges. The stems become thinner and the number of fruits decreases. Chlorosis is carried by aphids and ticks.
In order to prevent the disease, it is necessary to regularly spray the bushes and fertilize them with humus. It is also allowed to irrigate with poultry manure solution.
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