Diseases of currant leaves: descriptions with photos, treatment
The useful properties of currants can be listed for a very long time, because it is not for nothing that gardeners loved it so much. But even such a valuable berry for our immunity suffers from its own diseases. Most of them initially appear on the leaves, so it is important to notice and get rid of trouble in time!
Pimples and tubercles on the leaves
Incomprehensible formations or growths can be a laying of insect pests. But the relief of the plate itself periodically changes, and here it is important to eliminate serious consequences in time.
- The swollen red mounds on the leaves of the currant look frightening. But this is just a gall aphid that hides on the back of the plates. Unpleasant, but it is quite easy to fight with it;
- Thrips leave very small bumps and brown spots;
- Tumors on different parts of the bush, including leaves, appear when they are affected by bacterial cancer;
- Red convex spots can leave anthracnose - a dangerous fungus that will ruin the crop without treatment.
Leaves turn yellow and dry
It is not at all surprising if the leaves turn yellow in the fall or dry in the summer from heat. But throughout the year, currants react to completely different problems in this way: from improper care to the initial stages of serious diseases!
- If there is not enough water for the currant, the leaves will turn yellow and dry from the edges. The same thing happens if she is too hot on sunny days;
- When the sun is gone for too long, the plants turn yellow due to a lack of light. The fact is that the processes of photosynthesis and the release of green pigment are disrupted;
- When there are no other symptoms, and the conditions are normal, the problem may be in verticillus wilting. An inconspicuous at first glance fungus is important to diagnose as early as possible;
- Due to gray rot, currant leaves can dry literally before our eyes, but fungicides will help;
- When all the leaves are randomly covered with spots and stripes forming a bizarre pattern - this is a viral mosaic, and it is not treated.
Brown spots on currant leaves
If the bush is already covered with brown spots - there are no options left, and it is definitely sick. In the best case, currants have weakened immunity due to a lack of trace elements, but most often the fungus is manifested.
- The spots on the leaves darken and soften in the initial stages of decay. Perhaps the currant bushes accidentally flooded and you need to thoroughly dry the ground;
- Due to anthracnose, currant leaves are covered with brown spots with a whitish middle. Gradually, the fungus spreads to the entire bush, and productivity falls at times;
- Red spots - the main symptom of fungal rust, which is successfully treated with fungicides;
- If the bush is damaged by late blight, the root system suffers greatly. Leaves change color to brown from the base, and - starting from the bottom;
- Dots of a grayish-brown hue appear on currants with alternariosis. In this case, the leaves seem velvety to the touch.
Holes on currant leaves
If holes began to appear on the sheet plates, then someone literally eats them. This is dangerous for numerous caterpillars, which are especially fond of fragrant berry bushes.
- Most often, currant leaves are eaten by weevils. They prefer raspberries and strawberries, but can spread to the entire garden;
- The name of the leaf beetle speaks for itself, and the gluttonous bug eats the flesh of the leaf all the way to the veins;
- Almost all types of spotting can lead to the fact that individual affected spots die off. This is anthracnose, white, brown and brown spotting.
Currant leaves turn black
Most often, necrotic foci are already an advanced stage of the disease. This is especially true of rhizome damage, which is difficult to diagnose on time. But occasionally there are other reasons!
- Black spots on leaves and shoots may be a symptom of black rot;
- Black dots gradually extending into oval spots - a sign of black spotting;
- The leaves, shoots and buds of currant blacken with a bacterial burn;
- If the entire plate is covered with a black coating that can be erased, it’s probably a sooty fungus;
- Young leaves turn black, barely opened if the root system is damaged by a fungus and rots.
White plaque on currant leaves
A whitish spider web that resembles a thin coating - a product of pests. And if the white coating looks soft and velvety, as if it can be erased with a finger - the fungus took the currant.
- The main reason for the white coating is powdery mildew, which every gardener will inevitably encounter. She especially loves warm and wet days;
- In the same way, wet days are preferred by another fungus - downy mildew. She has a different pathogen, although the treatment remains the same;
- A spider mite abundantly braids leaves and shoots with a thin and light web, which from a distance can also be mistaken for plaque.
Pale and light leaves
If the leaves fade evenly throughout the plate, this may be a symptom of chlorosis. But chlorosis can hardly be called a specific disease, because this is just the external manifestation of a number of deviations.
- If the currant is sorely lacking in the sun, then the young leaves will grow pale;
- The shrub weakens and fades if it is cramped and stuffy. Therefore, it is important to maintain the distance between the seedlings and do sanitary pruning;
- If the leaves fade for no apparent reason - perhaps the soil is too depleted and it is time to feed the currants.
Currant leaves curl
The deformation of the leaves is external or mechanical, and then the currant was attacked by pests or a fungus. But if the leaves are already growing painful, perhaps this is a virus that has already penetrated the plant cells.
- Leafworms eat leaves from below, fold and glue the plates, and then pupate inside;
- The leaves dry, change color and are deformed in every possible way with a deficiency of trace elements. It is difficult to establish exactly what exactly is missing - zinc, magnesium, iron or molybdenum. Therefore, we recommend the use of complex immunomodulating drugs;
- If the currant bushes grow too closely or no one has thinned them for a long time, then the leaves can curl and wither away from a lack of air;
- The curly virus does not often manifest itself, but it is important to notice it in time and get rid of the infected plant.