2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
White spot, otherwise called septoria, actively attacks gooseberries with currants in the summer. Red currant is affected by such an unpleasant ailment to a lesser extent compared to black. The harmfulness of septoria is quite high, especially in the southern regions - the dead tissue on the infected leaves often reaches 20 - 50% of their total surface. This disease, in addition to the massive drying of the leaves, also causes their premature fall. And for diseased shoots, a very low growth is characteristic, and the berries are rather small on them
A few words about the disease
With a lesion with white spot, small round or angular specks appear on the leaves, the diameter of which reaches 2 - 3 mm. At first, they are painted in brownish tones, then their centers turn white, and only the edges remain brownish.
Tiny specks can sometimes appear on the berries. At first, they are brownish, flat and small, and after some time, such spots also turn white. Moreover, septoria does not bypass shoots. They often dry out, and with a particularly severe lesion, kidneys do not develop on them at all.
Fungal spores ripen in all specks, through which the harmful fungus spreads in summer. Severely affected gooseberry and currant leaves may even fall off.
The causative agent of septoria is considered to be a pathogenic fungus that hibernates in fallen leaves. In the spring, perithecia develop on it - this is the name of marsupial sporulation. These perithecia contain ascospores, which provoke the primary infection of berry crops.
The spread of the harmful fungus occurs by conidia in the summer. And the disease reaches its maximum development closer to the second half of summer. Throughout the summer, the main source of infection is infected leaves. To a large extent, high humidity and temperature contribute to the spread of septoria.
Particularly susceptible to white spotting are such varieties as Mleevskaya black Anneki, Boskoskiy giant, Bogatyr, Mleevskaya early, Nadyadnaya, Yunnat, Sanders, Laxton Tinker, Polesskaya dlinnokustaya, Vystavochnaya and Goliath. And the Leah fertile variety is less susceptible to damage.
How to fight
It is best to select varieties resistant to septoria when growing berry crops. All fallen leaves should be removed under gooseberry and currant bushes, as this is an extremely attractive place for wintering mushroom spores. The collected foliage can be safely laid in compost heaps. Also, in early spring or late autumn, you should thoroughly dig up the soil in the near-trunk circles.
When growing berry bushes, it is necessary to avoid thickening of plantings, since white spot attacks heavily thickened plantings with particular force. The spread of weeds on the site should also be avoided.
The soil in infected gardens, as well as berry bushes, is abundantly sprayed with copper sulfate or Nitrafen. It is advisable to meet this event before the buds begin to bloom. Also, if necessary, you can use colloidal sulfur, "Ftalan", "Kuprozan", "Khomycin", "Captan" or Bordeaux liquid. Ten days after the crop is harvested, a second spraying is carried out.
It is possible to increase the resistance of berry crops to septoria blight by introducing manganese sulfate into the soil, as well as a number of other trace elements - boron, zinc, copper and others. Only all of the above microelements should be added against the background of a full-fledged mineral fertilizer.
Before flowering, as well as after it, foliar dressing with 0.2% solutions of zinc sulfate or manganese sulfate will also serve well. It also has a good effect on plants and top dressing with a 1% solution of potassium salt, which is carried out first ten days after flowering, then twenty days later, and the last dressing after the harvest is harvested.
It is recommended to use drugs such as "Glyocladin", "Trichodermin" and "Rovral" as prophylactic agents. Using a working solution prepared on their basis, the soil is thoroughly shed.
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