Pests of red currant, the photo of which allows you to quickly determine the cause of a decrease in the yield of berries, are a rather serious problem for many gardeners. Diseases and pests can completely destroy the entire crop of currants. It often happens that gardeners, not noticing obvious signs of disease or pests on the currant, may consider that the bushes are simply aged, which is why the fruiting is reduced.
It is worth noting that red currant is highly resistant to diseases and some pests, therefore, most gardeners never encounter such problems. However, if there are many currant bushes on the plot, its owners need to know all the common diseases and pests of this plant, and in addition, methods of dealing with them. Plant treatment, as well as preventive measures to prevent the spread of diseases of red currant, can increase berry yields.
Common diseases of red currant and methods of dealing with them
Given that photos of various diseases of currant are available in any literature describing the subtleties of growing this crop, many avid gardeners can determine an existing disease even by minor symptoms. The following redcurrant diseases are the most common:
- powdery mildew;
- rusty septoria;
- white septoria;
- sphere library.
Powdery mildew is an extremely common fungal disease that can affect shoots, leaves and even currant fruits, forming a spider web or powdery coating on them. Damaged by this fungal disease, leaves and shoots stop their growth and die.
Another common redcurrant disease is anthracnose, which develops with increased air humidity and affects mainly leaves, forming characteristic brown spots on them. Subsequently, black spots and lacquered tubercles appear in these spots, which contain fungal spores. If your symptoms have your red currant, diseases of the fungal etiology should be treated with special chemicals.
Septoria is a fungal disease observed almost everywhere where redcurrants are grown in large volumes. With rusty septoria, the appearance of characteristic bright orange cones on the leaves of currant is observed, but with severe infection, such neoplasms can appear on shoots and on berries. With white septoria, there is the appearance of grayish cones bordered by a brown border. Further on such cones black specks of spore cells are formed, and the pathogenic fungus begins to multiply. In any photo, such pathological changes in the leaves against the background of damage by their fungus are very clearly visible.
Features of growing red currants
Signs of currant damage by fungal diseases can be seen in early spring. Even before buds open, you need to carefully collect all the fallen foliage under the currant, which was not collected in advance in the fall, and also treat the plant shoots with Nitrafen solution at the rate of 30 g per 10 l of water. The soil around the plant can be treated with the same solution. If signs of fungal infection were detected after flowering began, then it should wait until its completion and treat the leaves and stems of plants with 1% boric acid.
In addition, soda ash, ammonium nitrate and mullein infusion are excellent remedies for powdery mildew, but red currants can be treated with such means only after it has flowered. Processing should be carried out every 10 days so that the fungal diseases of the currant did not return.
The most dangerous viral diseases that can affect redcurrant include terry. This disease can affect absolutely all parts of plants. In a bush affected by terry, the appearance of three-lobed leaves instead of five-lobed leaves is observed, and the teeth on the edges of the leaves become smaller. In addition, genetic abnormalities in the formation of flowers, sepals and stamens are observed; therefore, plants strongly affected by this virus are not observed.
Given the viral nature of this currant disease, there are no good chemicals that can completely eliminate terry, so the treatment of this disease is very difficult. In the fall, it is recommended to trim the bushes and remove all leaves that have fallen from the affected plants in order to prevent the spread of the disease.
How to eliminate red currant pests from a garden plot
Currant diseases are often transmitted by pests, which can cause considerable harm to plants. The most common pests of currant include:
- currant goldfish;
- leaf aphids;
- kidney currant moth;
- gooseberry fire
- shoot aphid;
- spider mite;
- pale foot sawfly;
- gooseberry moth.
To eliminate currant goldfish in autumn, all shoots are cut and burned, since it is on them that malicious larvae winter. Treatment of plants from the widespread spider mite is carried out by treating currant bushes immediately after flowering with a drug such as Fitoferm, and after collecting berries as a prophylaxis also with Karbofos.
To eliminate the tick, plants can be sprayed with infusion of wormwood or tobacco throughout the season.
Redcurrant: pest protection
To prevent damage to plants with currant moth buds, early spring treatment of swollen kidneys with Karbofos is carried out. If traces of the gooseberry moth are revealed on the site, then treatment with Karbofos is carried out after the flowering of plants. Karbofos is also actively used to eliminate various types of aphids from currant bushes, but it is very important to spray not during the formation of flowers and berries.