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Diseases of raspberries and the fight against them


Raspberry diseases are very diverse. They can be identified almost immediately by the shoots, leaves, bush stem, as well as by the state of raspberries.

Content:

  • Anthracnose
  • Purple spot
  • White spot
  • Ulcerative spot
  • Rust
  • Bacterial root cancer
  • Witch's broom
  • Raspberry mosaic

Anthracnose

The fungal disease anthracnose manifests itself in the form of single spots of a grayish-white hue with a purple border on the raspberry stem. The leaves dry out, and in the affected areas, the tissue dries up and falls out.

The fight against disease should begin by using only healthy raspberry bushes for planting in order to prevent the disease process. Spray with a copper-containing solution three times a season, avoid thickening of the plantings. If the anthracnose still struck the raspberry bushes, then it is necessary to cut out all diseased shoots, collect the fallen leaves and burn them.

Purple spot

This disease is spread by fungal spores. The fungus infects the buds, stems, leaves, raspberry stalks. Initially, the affected area has a light purple area with black dots in the center (often at the point of attachment of leaves). The stem of the bush gradually collapses, cracks appear, the raspberries dry out, the affected area becomes reddish-brown.

It is necessary to thin out the plantings. Sick raspberry bushes are cut out.

At the beginning of the growth of shoots of this year, two weeks before flowering and after the harvest, they are sprayed with copper-containing solutions: 1% Bordeaux liquid (10 g per 1 l of water), Hom preparation according to the table on the package.

White spot

Fungal disease of raspberries is common. Leaves and stems of bushes are affected. Brownish spots appear on the leaves up to 3 mm. Over time, the spots turn white with a brown edging. During the period of sporulation, black dots are noticeable. On the stems in the central part of the shoots, near the buds, whitish spots with the same black dots also appear, the bark cracks.

Control measures are the same as for other fungal diseases: thinning of plantings, treatment with copper-containing solutions.

Ulcerative spot

Fungal disease. On the affected stems along their length, brown spots of a blurred shape grow. Black raised formations appear on the spots, which spray gray spores. The fabric quickly disintegrates, and the stains become friable, soggy. The disease develops with high humidity.

For ulcerative spotting, the control measures are the same as for other fungal diseases: thinning plantings, spraying with copper-containing solutions.

Rust

Fungal disease is common. It affects the shoots and leaves of raspberry bushes. In the spring, small yellow mushroom pads first appear on the top of the leaves. In summer, the undersides of the leaves are first covered with orange and then dark mushroom pads. In dark pads, spores overwinter on loose leaves. In humid conditions, the disease develops until late autumn.

Control measures are the same as for all fungal diseases: thinning of plantings, treatment with copper-containing fungicides. Slightly affected shoots can be shortened.

Bacterial root cancer

This disease is not immediately detected. At first, raspberries slow down their growth, and then they lose their taste - the berries become bland. The disease can also be detected by transplanting bushes. In this case, a tumor up to 5 cm in size can be seen on the rhizome, the base of the shoots or on the roots.

The cause of the disease can be an alkaline reaction of the soil or a long cultivation of raspberries in one place.

Such raspberry diseases are very difficult to cure. It is recommended after 3-5 years to change the planting site of the bushes and, in case of infection, to disinfect the roots. For 10 liters of water, take 100 grams. copper sulfate and immerse the roots there for 5-10 minutes.

Witch's broom

A very complex viral disease that can hardly be cured. Viruses spread through wounds inflicted by a non-sterile instrument, through the bites of sucking insects, root shoots.

Many thin shoots appear from the root of the bush, the bush grows. Over time, the shoots grow lower and lower, barely reaching 15-20 cm in height. The leaves are also much smaller.

Sick bushes gradually stop bearing fruit.

Aphid colonies should be monitored. Damaged bushes must be uprooted and burned.

Raspberry mosaic

Also applies to viral diseases. Viruses spread through wounds inflicted by a non-sterile instrument, through the bites of sucking insects, and root shoots.

In the shoot, the leaves become variegated with alternating light and dark green areas. The leaves become asymmetrical, bumpy. The disease manifests itself strongly in early summer, as well as at the end of the growing season, in late autumn.

Fruiting in the affected bushes is reduced, the berries become tasteless and tough. Young shoots degenerate - they become with small wrinkled leaves, become thinner.

Watch out for colonies of aphids and other sucking insects. Damaged bushes must be burned.

Having briefly reviewed the measures to combat the most common diseases, we remind you that to maintain the health of raspberries, you cannot neglect the implementation of simple agrotechnical measures: it is better to select resistant varieties of raspberries for planting on your site, carefully monitor and cut out affected shoots, burn them, thin out bushes, protect raspberries from sucking insects, change planting sites when laying new plantations.


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