All diseases and pests of roses are well known to avid flower growers. And for a novice summer resident, the information on this page will be of tremendous value. After all, the diseases of roses and the fight against them relate to everyone, without exception, because the culture is very sensitive to them. The most common diseases of roses are infectious burns, spotting, gray rot and powdery mildew. And the most important pests of roses are aphids, leaf wrappers, Rosan sawfly and caterpillars. Learn all you need about fighting pests and diseases roses can be on this page.
Here it is proposed to start to see the main diseases and pests of roses in the photo, which can easily recognize the problem.
Then, using the description of the disease of roses, you can identify the accuracy of matching symptoms. Well, after all this it remains only to choose the appropriate means of struggle, which can process plants.
Diseases of garden roses and the fight against them (with video)
The causative agents of infectious diseases of garden roses are pathogenic fungi, bacteria, viruses and other microorganisms.
Infectious burn - A disease affecting roses after removing the cover. A bright red ring appears on the shoots, which then turns black, and the shoot itself gradually dies off. Contributes to the disease of damage to the bark frost at the untimely shelter of roses for the winter.
Control measures. Patients shoots need to cut below the ring, to healthy wood. If the ring is not closed, scrape off the damaged bark to healthy wood and cover it with the “RunNet” preparation.
Look at these diseases of roses in the photo, where the main symptoms are shown.
Various spot spots (black, phyllosticose, septoria spotting) appear, as a rule, in the middle of summer. The spots come in various colors and shapes, the leaves turn yellow and fall off. Spotting develops with increased soil moisture and air, a lack of potassium, an excess of nitrogen.
Control measures. In the spring when opening roses, all roses should be sprayed with phytosporin in a therapeutic dose (7 ml / l of water). In May, repeat the treatment with phytosporin solution, but in a lower concentration (3,5 ml / l), then after a week, if the temperature is above 12 ° C, spraying with gamair (1 tabl / 10 l), after another week - alirin (1 tab. / Xnumx l). Do the same in June and July. If infection still occurs, collect and burn all affected leaves. Continue treatment with phytosporin, but with a therapeutic dose, alternating with treatment with a joint solution of alirin and gamair (one tablet of each drug per 10 l of water).
It is recommended to treat the plant itself and the earth around it with copper-containing preparations, better phytosporin.
Mučnistaâ rosa appears more often with increased air humidity, with sharp fluctuations in day and night temperatures, with excessive nitrogen fertilization, and potassium deficiency in the soil. Leaves and young shoots are affected. First there is a white bloom, and then gray spots. The leaves curl, the buds are not disclosed.
Control measures. Cut affected shoots, collect leaves and burn everything. Can process bushes copper-soap solution. But it is better to treat the extract of mullein (1: 10), or a five-day infusion of ash (1 cup / 10 l of water) or infusion of nettle.
Gray rot, or botrytis. The causative agent of gray rot is the fungus Botrytis cinerea, which affects about 200 various species of plants. In roses, flower buds with pedicels, the ends of young stems and leaves suffer from gray rot; in wet weather they are covered with a gray fluffy bloom. Diseased roses and most often varieties with light flowers are primarily susceptible to gray rot. The buds on the roses affected by botrytis do not open, rot and fall. Small brown specks appear on the petals, the leaves turn yellow and also fall.
The young roots of the cuttings are also affected by gray mold. Foci of infection persist in plant debris. Then the spores of the fungus spread insects and wind. Therefore, an undesirable neighbor for roses is, for example, horticultural strawberries, often suffering from gray rot. The disease appears on roses at thick plantings or if the rose garden is watered late in the evening and at high humidity.
To prevent root decay and improve the soil in May, place a tablet of glyocladin under each plant; try to repeat this procedure in August. Chemicals as a way to combat pests, use only when absolutely necessary.
Watch all these diseases of roses in the video, which shows the algorithm to combat them.
Pests of garden rose leaves and protection from them
The most common pests of garden roses are:
It is necessary to carefully monitor your roses and prevent the spread of pests of rose leaves, because it is not difficult to collect the emerged caterpillars or beetles while they are in single specimens. Having noticed a ladybird in the garden, transfer it to roses, let it fight with aphids.
Protection of roses from pests can be carried out using biological techniques. Use also defensive plants. For example, a rose garden can be set up, for example, with marigolds or nasturtium - they scare away the nematode and are effective against thrips. In the planting of roses, you can add decorative bows, which scare away harmful insects and help cope with the disease. Medicinal marigolds are grown among vegetables and flower crops to combat nematodes, mites, fusarium, butterflies, thrips. Parsley border is used as a deterrent for snails.
Look at the pests of roses in the photo, where they are shown in different angles.
Modern remedies for diseases and pests of roses
Phytosporin is a modern bacterial antifungal, anti-decay drug. Effectively remedy for such diseases of roses as late blight, fusarium, root rot, black foot, powdery mildew. It also helps against scab, rust, rhizoctoniosis, bacterial cancer, brown spot, Alternaria, peronosporaz. Phytosporin is an isolated and multiplied mass of beneficial microorganisms that, when released into the soil, destroy harmful bacteria. Available in briquettes, in bulk and liquid form. It is better to use the drug in liquid form. Therapeutic dose - 7 ml per 1 l of water, prophylactic - 3,5 ml per 1 l of water. Phytosporin has an alkaline environment, so it can not be interfered with anything. Starting in May, they are sprayed with plants regularly 1 every other week.
Alirin, gamair, glyocladin - A series of drugs to suppress the causative agents of fungal diseases in all types of garden crops, houseplants and in the soil. Applied as therapeutic and prophylactic agents. The preparations contribute to the restoration of beneficial microflora in the soil and on plants, are not phytotoxic, safe for humans, and remove the toxicity of the soil after the application of agrochemicals. Apply by spraying the plants or watering in the wells and under the root. When spraying, liquid soap should be added to the solution in the amount of 1 ml / 10 l. In case of severe damage to plants during the growing season, alternation with chemical fungicides is recommended.
It is dangerous to use chemicals from rose pests, as they are stored in the soil of the plot. But in some cases it is just necessary.
It is possible to recommend “Inta-Vir” and “Iskra” - they have a wide spectrum of action against such insects as May beetles, aphids, pennits, scale insects, leafworms, rosy sawflies, caterpillars, thrips. HB-101 - growth stimulator and activator of the immune system of plants. Organic product, in some ways, homeopathy for plants, safe for people and animals.
Tillage, spraying plants. The greatest effect is achieved using a simple aqueous solution. Dosage 1-2 drops on 1 l of water. It is important to observe the regularity of dressing and dosage accuracy. HB-101 has no shelf life and does not require special conditions for storage, the diluted drug is used immediately.