Diseases of rose leaves: descriptions with photos, treatment
Garden rose is appreciated for its magnificent decorative qualities. And that is why it is so unfortunate when she suffers from diseases, fungi or viruses. To find and fix the problem in time, regularly examine the leaves of the rosary. And we will tell you what to look for!
Pimples and tubercles on the leaves
Irregularities on the leaves of the rose remain due to insects that equip their masonry from the back. Sometimes the fungus leads to swelling of individual spots and patches.
- Pimples and tubercles on the surface of leaves leaves small aphids. It lays on the back of the egg, and in these places the plates swell;
- Thrips in the process of life can also damage leaf plates, but they are much less likely to settle on roses.
Leaves turn yellow and dry
This is the most common problem, and its causes can be literally anything - from heat to an incurable virus. In this case, we recommend watching the rose for several days to track changes in dynamics.
- If the rose is too dry and hot, it is the leaves that will react first, because the shrub is trying to preserve a valuable resource. Keep track of the temperature and vary the irrigation mode in accordance with the weather and season;
- Yellow and dry burns on the leaves remain if you water or rinse the rose in the midst of a sunny day;
- Chaotic yellow patterns are a classic symptom of a viral mosaic. She is not treated and even seems pretty, but in the future she will destroy the bush;
- Deficiency of iron or potassium leads to the fact that the leaves become bright yellow, but with green or purple streaks.
Brown spots on rose leaves
Unlike yellow, brown spots often indicate serious fungal or bacterial diseases. Here it is important to take action as soon as possible until the infection has spread to the entire rose garden.
- If you constantly transfuse the rose, the leaves will begin to gradually darken and rot. Therefore, it is important to control soil moisture;
- Bright red spots are a characteristic symptom of fungal rust. But it only looks scary, but in fact, a common disease is perfectly treated with fungicides;
- Dark spots spread over the leaves and shoots from top to bottom when affected by gray rot. Gradually, a fluffy grayish coating of spores appears;
- Chaotic red-violet spots - an indicator of peronosporosis. Later it leads to cracking and death of the buds, so that the rose may not bloom;
- Brown spots are left by cercosporosis, because it is literally a brown spotting of a rose. The fungus loves heat and high humidity;
- Brown spots with a white center - a symptom of Septoria. Phylostictosis and pestalium appear in approximately the same way, but the same fungicides help from them.
Rose leaves turn black
The leaves begin to blacken rapidly due to irreversible damage or dangerous diseases. Sometimes the problem is improper care, but this is more common for sensitive young seedlings.
- Black spots on the leaves and shoots are formed due to a bacterial burn;
- Stem cancer also leaves tumors with ulcers, and in the future it can destroy the rose completely. Most often, it penetrates into open wounds, so all cuts and damage should always be treated;
- Due to black spotting, the rose is covered with rapidly spreading dark spots. Leaves fly from top to bottom;
- False powdery mildew in symptoms on roses is more likely to resemble black spotting than a white fungus. Although sometimes the spots may be reddish or purple.
White plaque on rose leaves
At first glance, a velvety white coating may even seem beautiful until you find out that these are fungal spores. Although sometimes they can be confused with the weightless cobweb that some insects leave.
- Powdery mildew leaves the same white velvety coating after prolonged rains;
- Among the branches and leaves are hidden spider mites that braid the rose with a whitish web;
- Small white spots remain when the leaves are attacked by a rosette. It is easy to see visually from the back along the veins.
Pale and light leaves
Healthy and young leaves should not fade for no reason. So, there is a violation in agricultural technology or the rose has already begun to develop a disease.
- If the roses do not have enough nutrition, the leaves will turn pale and wither. Do not forget nitrogen in the early spring and complex feeding during the season;
- Young shoots grow painful if the bushes are planted too close to each other. They are cramped, and they absorb all the elements from the ground;
“A rose will always be light and pale if she constantly lacks the sun.” This disrupts the process of photosynthesis, therefore, for planting in the shade, varieties adapted to such conditions are needed.
Rose leaves twist
Leaves curl into boats, tubules and other strange shapes due to serious viral lesions. Although sometimes the problem is not so radical, and it is enough to get rid of pests and fungus.
- Leaves can be deformed because they lack light and air. Therefore, roses need regular sanitary pruning and thinning;
- A deficiency of individual trace elements also leads to deformation, because roses need a lot of nutrition for copious flowering;
- The curly virus is poorly understood and incurable, but it rarely infects roses. Although it is also worth keeping in mind in order to preserve the healthy part of the rosary.