2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Chlorosis of raspberries is manifested in the yellowing of the leaves of this wonderful berry culture. This is a very unpleasant viral disease that causes a lot of trouble, since such ailments are practically not amenable to treatment. The leaves on the fruiting shoots become noticeably smaller, the shoots are characterized by rather weak growth, and the resulting berries are practically unsuitable for human consumption, since they are woody and dry. It is much easier to prevent this disease than to cure it later
A few words about the disease
At the very beginning of the disease, the leaves begin to turn yellow along the veins, and after some time they will turn yellow entirely and will somewhat resemble autumn foliage. Only with the onset of autumn does chlorosis recede slightly. The dark spots appearing on the leaves are characterized by a rather uneven color.
When infected with chlorosis, the shoots of root shoots of infected bushes are noticeably thinner and significantly extended compared to healthy bushes. At the same time, the berries become somewhat one-sided and often dry up, do not have time to ripen.
Among the varieties most susceptible to chlorosis are the following: Fastolf, Yellow Spirina, Usanka, Novost Kuzmina, Turner and Marlborough.
Chlorosis is caused by a virus that lives in the cells of living organisms and develops in them. It can spread by sucking insects (aphids in particular), various herbivorous mites, with the sap of infected plants, with planting material (in particular, root shoots) and with non-disinfected garden tools.
It is impossible not to mention that chlorosis affecting raspberries can be of a nonparasitic nature. Disease of this type (physiological chlorosis) can be caused by unfavorable weather conditions, as well as a lack of a number of nutrients - boron, manganese, iron and others. Chlorosis can also occur when soil moisture is high enough in combination with its strongly alkaline reaction and cool weather. If you pour quite cold water on the raspberry, you can also provoke chlorosis.
How to fight
Whenever possible, only healthy planting material should be purchased. It is best to select raspberry varieties that are resistant to chlorosis. These include the Russian harvest and the collective farmer. The row spacing periodically needs to be loosened, the soil fertilized, and the damp areas should be drained.
To prevent chlorosis from spreading further, timely treatments of vegetation against sucking insects should be carried out. In early spring, before bud break, spraying from aphids is carried out with 0.2% nicotine sulfate solution or 3% nitrafen solution. Aphids at this time are just hatching from overwintered eggs. And before flowering, a good effect can be achieved by spraying with a 0.1% emulsion of thirty percent methylmercaptophos. After treatment with this drug, at least 45 days must pass before the start of harvesting.
All bushes showing signs of chlorosis should be immediately uprooted and burned.
If chlorosis is physiological in nature, then it is imperative to establish the cause of its occurrence. At high humidity, you should try to reduce it. If the reason was a high alkaline soil reaction, then it is reduced by adding gypsum per square meter - from one hundred to one hundred and twenty grams. For irrigation, use only water warmed up in the sun. And the best for irrigation will be water taken from open reservoirs (lakes, ponds and rivers).
As for fertilizers, in case of chlorosis, nitrogen-containing top dressing should be applied first. Potash fertilizers are applied carefully, in small doses, and it is better to refuse fresh manure and pure superphosphate altogether - they can aggravate the disease.
To weaken chlorosis, forest litter, peat, compost or humus are introduced into the soil. They should be brought in for each square meter, 5 - 6 kg, once every two to three years. Fertilizing irrigation with the addition of poultry manure will also serve well - one part of the manure will require ten or twelve parts of water.
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