What diseases threaten roses in the garden: the main types and methods of struggle

  • Aug 10, 2021
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Roses are gentle and beautiful creatures of nature that need constant care and protection from dangerous fungal infections and other diseases. To maintain plant health, you need to know the main signs of disease and what emergency measures should be taken in each case.

Roses. Illustration for this article is used under a standard license © ofazende.com
Roses. Illustration for this article is used under a standard license © ofazende.com
Roses. Illustration for this article is used under a standard license © ofazende.com

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Getting rid of powdery mildew

Fungal disease initially appears as a white coating on the leaves and stems. Over time, the shoots thicken and bend.

Preventive measures:

  • Avoid a decrease in the level of calcium and excess nitrogen in the soil.
  • Do not overfill or dry out the soil.
  • Plant roses in light sandy soil.
  • Avoid heavy shading of bushes.
  • Protect from sudden changes in temperature and drafts.
  • Choose disease resistant varieties such as Gloria Day.

When a disease occurs, spraying with drugs is used:

  • "Topaz";
  • Fundazol;
  • "Tiovit Jet".
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Fighting rose rust

If in the spring, especially after a warm and damp winter, red dust appears at the base of the main shoot and stems in the area of ​​the buds, then this indicates an infection of roses with a rust fungus. The disease takes away the strength of the plant, disrupts the main functions of life and metabolic processes, which ultimately leads to yellowing and early fall of leaves, curvature of the stems. Typically, fungal spores are carried by air, water and seedlings.

Rose processing. Illustration for this article is used under a standard license © ofazende.com
Rose processing. Illustration for this article is used under a standard license © ofazende.com

How to fight:

  • Use fertilizers where not only nitrogen is in the composition.
  • Loosen the soil and remove weeds around the bushes, use mulch.
  • Remove and burn the affected plant parts in a timely manner.
  • Before blooming the leaves in the spring, spray the ground part of the plant with a 1% solution of copper sulfate or similar preparations such as "Khom", "Oksikhom" or "Ordan". Repeat the procedure after bud break.

Protecting against black spot

Fungal disease manifests itself in the second half of summer in the form of dark brown spots on leaves and young shoots. The leaves gradually completely darken and fall off, and the next year the roses weaken noticeably and stop blooming.

What measures to take:

  • Do not thicken the planting and avoid heavy shading.
  • Provide good ventilation for the plants.
  • Observe the technology of cultivation and care.
  • Destroy all affected leaves.
  • Spray during vegetation with preparations with copper, and when a disease occurs - with systemic fungicides, such as "Skor". At high humidity, repeat the treatment.

Treating bacterial cancer

The formation of lumpy white or brown growths on the roots and at the base of the stem, and in some varieties and on the entire surface of the shoots, indicates a disease of roses with bacterial cancer.

How to prevent disease and help a plant in case of disease:

  • Avoid excess moisture in the soil.
  • When weeding and loosening, try not to damage the roots of the plant, as well as destroy insects that threaten the root system.
  • Do not abuse manure when feeding.
  • Plants with a damaged root collar must be removed from the site.
  • In case of damage to the lateral roots, the growths are cut off, and the rhizome is placed for a few minutes in a solution of a preparation containing copper, washed and immersed in a mixture of clay and sand.

Preventing branch burns

Branch burns are caused by a fungus that can be detected by the reddish-brown spots that cover the stems of the roses. By the end of summer, such branches completely die off.

What to do to protect:

  • After wintering, it is necessary to free the roses from the shelter as soon as possible in order to protect them from excessive moisture and the risk of developing the disease.
  • Inspect the plant regularly and remove diseased stems. Burn the cut off parts.
  • If a disease is detected, spray with preparations with copper.
  • Observe the rules of care.
  • Cover for the winter in dry weather, and before sheltering, remove green leaves and shoots and spray the plant with 3% Bordeaux liquid.
Rose processing. Illustration for this article is used under a standard license © ofazende.com
Rose processing. Illustration for this article is used under a standard license © ofazende.com

We treat cytosporosis

A fungal disease manifests itself in the form of noticeable reddish-red tubercles on the skin, causing cracking of the surrounding tissues, further growth, and at the end, complete drying out of the branches and death of the plant.

Protection measures:

  • Protect plants from frost and sunburn.
  • Timely carry out pruning, watering and follow other rules of agricultural technology.
  • Eliminate mechanical damage to plant stems.
  • At the beginning of the growing season, before the buds swell, spray them with a 1.5% solution of copper sulfate, as well as the stems with 3% Bordeaux liquid.

Preventing gray mold infestation of roses

The fungus affects the upper part of young shoots, leaves and buds of white and pale pink roses. The disease causes yellowing and dropping of leaves, rotting and death of buds. For the treatment and prevention of gray rot, the same methods are suitable as for other fungal infections. In addition, it is recommended:

  • Do not plant garden strawberries nearby, as they can be a carrier of fungal spores.
  • Choose a time for watering roses so that the leaves have time to dry before nightfall.

That's all there is to know about rose diseases in order to take protective measures in time and continue to enjoy the pleasant scent and lush bloom of these fastidious yet charming flowers.

Do you know what diseases threaten roses in the garden?

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