Noncommunicable diseases of roses.
Eating disorders (lack of an element), an excess or deficiency of moisture, frost in the spring or hot summer give rise to non-infectious lesions roses. Knowing the symptoms of such diseases can be cured.
A very important element is nitrogen supply roses.
With a lack of nitrogen leaves roses lose their green color, they appear red dots; leaf blades are narrow. Roses are particularly sensitive to the lack of nitrogen in the spring, when it is required for the enhanced growth of new shoots, leaves, buds. In the case of nitrogen deficiency roses need to feed urea or ammonium nitrate, or any complete fertilizer containing nitrogen (1 tbsp. Tablespoon per 10 liters of water).
But it is better to make a top-dressing of roses together with trace elements (dose - 1 teaspoon in a bucket of water). Spray roses preferably in the evening or on a cloudy day, using only freshly prepared solution of fertilizer. With an excess of nitrogen foliage roses becomes dark green, lush roses shoots grow, forming little flowers; Such plants are easily exposed to fungal diseases.
A very important role in the process of respiration and metabolism of plants plays phosphorus. It supports cell turgor, enhances root growth, promotes hardening of roses and increases their resistance to frost. On alkaline soils phosphorus compounds pass into insoluble and therefore are not available for retail sale, which comes phosphorus starvation.
With a lack of phosphorus on leaf margins roses formed purple-brown stripes and spots; leaves become smaller, become narrow, moving away from the shoots at an acute angle. Inhibits the growth of shoots of roses; the leaves fall.
Many experts suggest the shortage of phosphorus to fertilize roses superphosphate (1 tbsp. Tablespoon per 10 liters of water), soil zamulchirovat peat, and then repaired it in the ground. But this fertilizer does not penetrate deeply into the soil. Therefore it is better to fertilize roses suitable soluble fertilizer (such as "Strawberry concentrate"), which includes a phosphoric acid - it is very quickly absorbed by plants.
Potassium affects the aging shoots roses and correct preparation of plants for the winter, as well as increases their resistance to fungal diseases. With a lack of potassium leaves turn yellow roses to the brim; leaf veins remain green at first. Gradually, the entire leaves turn yellow, then shrivel and become reddish-purple color. Potassium is often not enough roses growing on sandy and peat soils. In these circumstances, it is necessary to feed the roses potash fertilizer (or "strawberry concentrate" containing potassium).
With an excess of potassium in the pitch there is a deficiency of calcium, which is essential for normal growth of the plants above-ground parts and roots. If there is insufficient calcium stems and leaves of roses become weakened; affects the apex of young leaves; flower stalks die; roots develop. In this case, you should fertilize the plants calcium nitrate (1 tbsp. Tablespoon per 10 liters of water) or "Cucumber concentrate" - are one and the same.
Potassium, magnesium, and iron are involved in chlorophyll formation, without which it is impossible photosynthesis in plants. These elements are present in sufficient quantities in all soils, except sandy and partly peat. With a lack of potassium, magnesium and iron chlorosis occurs in roses - non-infectious, but dangerous disease: pale and yellow leaves, and leaf veins remain green.
With a lack of magnesium in the rose bushes in the middle of summer, first on older leaves, and then at the young appear discolored patches. Between the leaf veins are formed dead yellow-red patches, and edges of the leaves remain green.
In neutral, alkaline and calcium-rich soils, plants often lack iron. Rose leaves turn yellow, starting from the edges and around the veins remain green narrow strip. Particularly affected are the young leaves. To make up for the lack of iron, it is necessary to make the soil acidic peat or any fertilizer. Helps to meet the needs of plants in the iron using iron chelate. Preferably two or three times to conduct foliar fertilizing roses iron-containing preparations.
Chlorosis infects plants and a lack of manganese - Rose leaves turn yellow between the veins from the edge to the center, forming a land in the shape of the tongue. Yellow coloration appears on the older leaves. In this case, it is necessary to feed the plant, manganese sulfate (0.5%).
In addition to these substances, roses need some micronutrients consumed in small amounts, but vitally necessary for plants. Among them, - sulfur, boron, copper, zinc, molybdenum, silicon, cobalt. One of the most important elements for plants is boron, which promotes the growth of the leaves. With a lack of boron growing point dies young shoots, leaves are deformed, their edges are bent.
Ash is a good source of boron, so during the growing season under the rose is made in the form of ash fertilizing: it is dispersed around the bush, and then buried in the soil. With a lack of copper tips of the leaves turn white roses, then do the leaves lose turgor and wilt. With a lack of molybdenum in the fall roses buds and flowers.
Zinc helps plants absorb from the soil nitrogen, phosphorus, potassium and calcium. If zinc is small, around the edge of the paper roses spread chlorotic spots. Green color is preserved only along the veins. Sulfur has an impact on the redox processes in plants. With a lack of sulfur veins of leaves turn yellow roses; the leaves appear red spots of dead tissue.
Sulfur and silicon are usually contained sufficient in almost any soil - they are made in the ground with organic fertilizers (manure and humus). Note, however, that an excess of trace elements acts on Rose depressing, and may even cause their death. Therefore, to make them in the soil should be no more than twice a year - in the spring (at the beginning of the growing season), and after a summer crop, along with a complete mineral fertilizer.