2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Anthracnose is a very common fungal disease in raspberries. As a rule, it attacks the stems and leaves of annual shoots, as well as fruit clusters and young growth of biennial shoots. Anthracnose usually begins to develop in the spring, after the tender leaves have blossomed. Moreover, in wet seasons, raspberries are struck with particular force. In order not to lose the harvest of juicy berries, it is important to detect this attack in time and immediately begin to fight it
A few words about the disease
On raspberry leaves affected by anthracnose, brownish small spots surrounded by purple edges are formed. If the lesions are especially strong, then the spots gradually merge, and the leaves dry up and die.
In the upper parts of annual stems, gray and rather large rounded sores appear, which surround the edges of reddish-brown shades. At the same time, the bark on the stalks turns brown and becomes covered with rather deep sores, taking the form of an impressive crust.
Young parts of biennial shoots attacked by anthracnose quickly die off. In this case, the fruit brushes gradually turn brown, and the berries dry out.
The causative agent of raspberry anthracnose is a pathogenic fungus overwintering on infected stems.
How to fight
When growing raspberries, it is necessary to follow agricultural techniques and remove damaged parts in a timely manner. Infected plant debris should be promptly destroyed. Growing relatively resistant raspberry varieties can significantly reduce the likelihood of damage to berry bushes by the ill-fated anthracnose.
When planting raspberries, you need to try to comply with the recommended planting density, as well as provide the berry bushes with good ventilation. It is better not to plant raspberries in wet and low areas. And it is also important to try not to allow excessive watering of berry bushes.
In the spring, at the initial stage of budding, berry plantings are treated with a 1% Bordeaux mixture. And during the summer season, it is recommended to carry out preventive treatments with copper oxychloride (for ten liters of water it is taken from 30 to 40 g) or Bordeaux liquid. The first spraying is carried out when the growing shoots reach a length of fifteen to twenty centimeters, the second - before flowering, and the final, third - immediately after the berry bushes have faded. And if a harmful ailment attacks raspberry plantings with special force, it is allowed to carry out processing after the harvest is harvested.
As for the fungicide treatments, they should be carried out even before the raspberry buds begin to bloom. And subsequent treatments are carried out after the shoots have grown by about twenty to thirty centimeters, as well as before flowering and at the end of the harvest. Copper-containing preparations of combined or contact action, such as copper sulphate, "Abiga-Peak" and "Oksikhom", are well suited for spraying. But such contact drugs as "Profit" and "Ditan", in this case, will be less effective.
There are also a number of new generation combined systemic contact fungicides that are excellent for rescue treatments. They are good because they have anti-spore, as well as curative and protective effects. These include Skor, Acrobat, Profit Gold, Fundazol, Previkur, Ordan and Ridomil Gold. By the way, "Fundazol" is not recommended to be used more often than once a year, and it is used only in case of a particularly severe lesion.
Having harvested a crop of fragrant berries, the infected annual shoots, along with those already bearing fruit, must be cut off so that there are no stumps left, and burned. As for the shoots slightly affected by anthracnose, it will be quite enough for them to cut off only the tips. And in late autumn, just like in early spring, the soil under the raspberry bushes is well dug up, embedding high-quality phosphorus-potassium fertilizers into it.
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