To understand why the leaves of cucumbers dry in the greenhouse, you can, after careful study of the conditions of growing vegetables. The reasons can be many: from improper watering and oversupply of fertilizers to the attack of pests or the occurrence of viral diseases. By eliminating the error, you can quickly restore the normal condition of the cucumber bushes and save the harvest.
Dry leaves: what could be the cause
Cucumbers - quite capricious culture. Beginners taking their first steps in vegetable production face many problems, one of which is the gradual yellowing and drying of the leaves. The reasons may be many, among the main ones:
- insufficient watering;
- too dry air in the greenhouse;
- excess or lack of nutrients in the soil;
- plant damage by pests;
- viral or fungal disease.
To understand what exactly caused the drying of the leaves, it is important to examine the affected plant. Pay attention to the appearance of the affected leaves, their color, the presence of dust, cobwebs, dots or spots. Much depends on the general condition of the cucumber bush, as well as on how the rest of the planting looks.
Problems with care
Dry leaves can appear even in very young seedlings. Among the main reasons:
- lack of moisture;
- wrong soil composition;
- insufficient or excessive food;
- unsuccessful place to place plants;
- too dry air in the room.
It is impossible to use purchased soil for planting seeds, it is not sufficiently nutritious. Ideal - a mixture of garden land with peat or humus.
It is possible to add a small amount of sand. Heavy clay soils cause stagnation of moisture, the leaves on the plants will turn yellow and fall off. It is important to use the same ground that will be laid out along the beds in the greenhouse.
An abrupt change of soil can affect the condition of the plants, they will stop growing and start dropping leaves.
Proper watering is very important. It is necessary to use only warm water, thawed, separated or boiled. Hard or cold water can cause shock in young plants, the leaves will begin to curl and dry, and then fall off. The same phenomenon is observed with insufficient watering.
Moisten the ground in containers with seedlings should be daily, before the emergence of shoots boxes covered with plastic wrap.
Young plants should be protected from drafts and sudden changes in temperature.
Before planting, complex mineral fertilizer is applied to the soil. Fertilizing with a minimum nitrogen content is preferred, it can also affect the condition of the leaves. Instead of mineral complexes, you can use organic matter: an aqueous solution of mullein or bird droppings. After feeding, the plants must be watered with clean warm water. Fertilizers caught on the leaves will dry them, weakening the plants.
Features of the content in the greenhouse
Leaves may be affected by too dry air. For normal growth of cucumbers, a constant level of humidity of at least 85% is necessary. Provide the right atmosphere will help barrels of water for irrigation, placed next to the landings. Watering by sprinkling is very useful, moisture is sprayed over the plants, maintaining the normal state of the leaves and stems. If there is no rain plant, cucumbers are poured from a hose with a fine-mesh spray.
Many gardeners install an automatic drip irrigation system in the greenhouse.
It provides normal soil moisture without the presence of the owner, saves water. In order not to harm the cucumbers, you need to organize a system for the sedimentation of water, without connecting the watering installation directly to the water pipes. If this is not done, cold water will flow to the roots of the plants, which can cause root rot and quick drying of the leaves.
Very often the leaves dry out due to direct sunlight. Bright sun is especially dangerous after watering. Drops of water serve as lenses, the refracted rays burn out holes in cucumber leaves, plants begin to wither and dry. In hot sunny weather it is necessary to close the windows with special curtains.
The reason for the drying of the leaves can be the wrong selection of fertilizers. To understand what is missing cucumbers, it is enough to carefully examine the landing.
With a lack of nitrogen leaves become pale, sluggish, gradually dry and fall off.
The lack of phosphorus will be indicated by very dark leaves with a purple tint, they shrivel, become brittle and brittle. When magnesium deficiency leaves the leaf brown, dry quickly and fly around.
An aqueous solution of complex fertilizers, which is applied before transplanting seedlings to the greenhouse, will help to correct the situation. During the season the plants need to feed another 2-3 times. Birch ash is very useful, and diluted bird droppings will do. After fertilizer planting necessarily watered, it will help avoid burns.
Diseases and pests
Greenhouse content does not protect plants from pests.
The larvae and adult insects suck out plant juices, the leaves dry out, turn yellow and fall off. The most common pests include spider mites, aphid and whitefly. The presence of a tick is indicated by thin whitish threads on the petioles and stems.
Whitefly can be recognized by bright spots on the back of the leaves.
Aphids affected by the lash are covered with a sticky coating. With a strong defeat leaves weaken, pale, dry. Insect larvae suck juices, preventing plants from developing normally.
It is necessary to fight pests in a complex. Be sure to destroy weeds, when airing the vents of greenhouses tighten gauze. Affected plants are abundantly sprayed with a solution of potassium permanganate or prepared insecticides. Chemical treatment can be carried out only before flowering.
Cucumber leaves can also dry out due to illness. Plants are often affected by viruses that cause spotting, yellowing, twisting of the leaves. Sick cucumber bushes need to dig and destroy. As a preventive measure, spill the soil with a hot solution of potassium permanganate (the procedure is done before planting). It is recommended to seed the cucumber seeds by soaking it for a short time in an aqueous solution of potassium permanganate or hydrogen peroxide.
Very frequent illness - downy mildew.
This fungal disease can provoke: too abundant watering, cold water, infected planting material. On the leaves of diseased plants appear small yellowish spots, which are gradually replaced by a noticeable bluish bloom. The affected leaves gradually curl, dry and fly around. The same fate awaits and ovary cucumbers.
Spraying sweets with Bordeaux mixture or other copper-containing preparations will help to combat powdery mildew. Shrubs with a high degree of damage is better to dig and burn. It is impossible to place them in the compost pile, tenacious spores can cause diseases of other plants.
Drying cucumber leaves can talk about diseases, pests, lack of care. It is important to notice the problem at an early stage and take action as soon as possible. Comprehensive treatment will help to quickly cope with the disease and save the next harvest.