Black currant terry: causes and methods of struggle, what to do for treatment

Currants are often exposed to various diseases and pests. On your site, you can observe how fragrant currant leaves are wrapped from aphids or rust, the berries fall for no reason before they are ripe. This should also include the terry of red and black currants. What kind of disease, why it occurs and how to deal with it, you should know in advance.

Description and causes of the disease

Important! The main reason for the infection of bushes with terry is the presence of a currant bud mite. Parasite infestation occurs during the renewal of plantations.Ticks can be introduced during the planting of new seedlings. Another option is to use untreated garden tools. If you cut the branches of an infected young growth, and then a he althy bush, then the disease will certainly be transmitted.

The kidney tick is only a carrier of the disease. The disease itself is the vital activity of a microscopic virus, which develops very actively in the vessels of a plant. Moving along with the juice along the shoots, it affects the entire bush. If in the first year of life the disease may not manifest itself, then as the currant gains strength, it begins to be oppressed by the microplasma virus. Then not only foliage suffers, but also inflorescences.

As a result of the complete infection of currants with the causative agent of terry - the degeneration of the variety, its return to the wild state. In another way, the disease is called blackcurrant reversion.

Signs of doubleness

Terrying is a serious infectious disease of blackcurrant bushes, leading to the degeneration of varieties and the plantings themselves. You can detect the disease by the following symptoms:

The presence of a large number of branches with small leaves that do not have a specific currant smell.
In addition to greenery, doubleness can be determined, and often happens, by flowers. If currants normally have yellow flowers, in the place of which a green berry is born after flowering, then the diseased plant has pinkish or purple flowers. We can say that they are empty, after them the ovary is not formed.
Defective three-lobed dark green leaves appear at the end of each shoot.
Small veins are practically invisible on the leaves.
Sick bush blooms later, the berries are very small.

If you detect terryness in time and start treatment, then it is possible to save the berries. Otherwise, you will have to part with the new purchased variety of large currants without waiting for fruiting.

How bush infestation spreads

According to gardeners, not only the bud mite is a carrier of the virus, but also other insect pests:

aphid;
herbivorous bugs;
spider mite.

Pathogenic microorganisms can spread during the propagation of the bush: when cutting, separating lateral offspring. In any case, the planting material is already infected with the virus. It is difficult to determine the disease of young seedlings, since outwardly the virus may not manifest itself in any way. But a year or two after planting, the plant will slowly begin to die.

Methods for dealing with defects

Terry is a very dangerous disease of berry plantations. You won't be able to get rid of it completely. Even if the plant is destroyed at the root, the virus is still present in it. Therefore, it is impossible to plant young shoots on a stump where a diseased bush grew.

Important! You can only destroy the virus together with the bush.

Then how to deal with terry? The main thing is to protect your lands from the attack of the "enemy", or to prevent the already existing pathogen from spreading. First of all, this concerns the kidney tick:

Treatment of viral terry blackcurrant occurs by pruning the shoots affected by the bud mite and removing diseased buds. In the spring, tick settlements on the kidneys become especially noticeable. Not having time to open up, they become swollen, not dense. These buds should be cut off and destroyed. If there are many buds, then the entire shoot is removed. The procedure must be performed before the buds open.
In the fight against ticks, hot water is very effective. Infected shoots are cut back to he althy wood. The remaining branches are tied together and scalded with water, the temperature of which should be up to 80 degrees.Pruning diseased branches are always destroyed, in the spring you can burn with last year's foliage.
To combat currant terry and spider mites, you can use special preparations that have insecticidal properties. These include: colloidal sulfur, Lepidocide solution, Bitoxibacillin, Fufanon, Akarin and others, which are sold in specialized stores. It is important to dose the product according to the instructions.

Terry red currant disease is similar. Accordingly, the treatment is the same. All the procedures described above can be used to preserve the plantings of red and white currants.

Folk methods of dealing with terry

Among the folk methods of treating plants from bud mites and aphids, carriers of the virus, the following remedies are distinguished:

tobacco dust, infusion;
infusion of garlic;
infusion of onion skins.

All treatments must be performed only as pests are detected.

Prevention measures

It is very important to follow the following recommendations from experienced gardeners:

When buying new seedlings, the material is carefully selected. The best purchases are seedlings from a nursery or from well-known and trusted gardeners.
It is necessary to monitor the condition of the young, as outwardly the disease may not manifest itself for about 4 years. In this case, the purchased bushes are planted away from the adult berry grower.
When propagating currants by cuttings, only he althy currant bushes are chosen as a mother liquor.
Choose varieties that are resistant to diseases and pests.
Regularly inspect shrubs for bud mite damage.
Timely and correct pruning. If the shoots are severely cut, then young offspring will appear from the root in large numbers. They attract pests such as mites and aphids.

Only an integrated approach will help to cope with mass infections of currant bushes with terry.

Any of the types and varieties of currants is annually attacked by a huge number of pests, but the most dangerous is the terry virus. It is insidious in that the only way to get rid of it is the complete destruction of plantings. Preventive measures are aimed only at combating its carriers.