2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Terry, or reversion of black currant is a very dangerous viral disease, especially common in the Central and Northwest regions. The main carrier of such a misfortune is the kidney currant mite. Terry is manifested mainly during flowering by deformation of leaves, shoots and flowers. And currant bushes strongly affected by this ailment completely cease to bear fruit. Moreover, the bushes that get sick with terry in most cases do not recover
A few words about the disease
This ailment is characterized by the appearance of sterile and rather ugly flowers on the currant bushes. The petals of these flowers stretch out, becoming narrow, seem terry and acquire a lilac hue. In this case, berries are rarely tied, and if they do, they will also be ugly.
With a sufficiently strong infection, the flower brushes turn into thin branches covered with scales instead of flowers. The veins of the leaves of young shoots become noticeably coarse, and the leaves themselves become dark green and strongly elongate, turning into three-lobed instead of five-lobed. Also, the characteristic smell disappears from the leaves.
It is noteworthy that due to the rather slow spread of the disease through currant bushes, on the same bush, healthy flowers, shoots, flower brushes, and sometimes isolated skeletal branches can often be found simultaneously with the sick.
This disease is caused by small particles of protein living matter - living only in the cells of living organisms and in the same developing virus. Also, quite often on the berry bushes you can see quite swollen buds - this is the result of their defeat by the terry carrier, the harmful kidney currant mite.
The spread of a destructive virus often occurs when infected cuttings are grafted onto healthy vegetation, as well as when various crops (healthy and sick) are cut without intermediate disinfection of the working tool. Also, the virus can be spread by various sucking insects (aphids in particular), with sap of infected plants and herbivorous mites.
How to fight
When growing currants, you should pay attention to healthy planting material and, if possible, observe quarantine measures. Cuttings are best harvested from healthy bushes that have not shown signs of reversion for three to four years. Also, in order to prevent the spread of terry, all vegetation should be timely treated against various sucking insects. No less important is the fight against the vector of the disease - a rather dangerous kidney currant mite.
Regarding varieties of black currant, it can be noted that such varieties as Pamyat Michurina, Leah fertile, Zhelannaya, Neapolitanskaya, Shinyushaya, and also Primorsky champion are considered the most resistant to reversion.
To increase the resistance of black currants to terry, it is periodically necessary to feed it with potassium-phosphorus fertilizers. Foliar dressing with solutions of molybdenum, boron and manganese will also serve well. But it is not worth increasing the dosage of nitrogen fertilizers, since such a measure can give a completely opposite effect and greatly contribute to the appearance of terry. At the end of the berry picking, currant bushes are treated with colloidal sulfur or Karbos.
Currant bushes with signs of reversion are uprooted and burned. At the same time, it is categorically not recommended to return the currants to the same place over the next five years, and the newly planted bushes will require constant monitoring for at least four years.
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