Many gardeners use the seedling method of growing cucumbers to get an early harvest. Anxious care of seedlings does not always give the desired result. One of the most common problems is that the leaves begin to turn yellow. Seedlings are also susceptible to this. Why this happens and what to do - this is the article about this.
Why can yellow or white spots appear, diseases develop, fruits fall off, stems dry out? The yellowness of the leaves can appear for a number of reasons. You should not immediately get rid of damaged shoots, first you need to figure it out. The general picture of the state of the soil, the root system will prompt the criticality of the situation and help determine what to spray cucumbers with and what other activities should be started immediately. Gardeners distinguish the following among the main reasons for yellowing of leaves:
If the cotyledon leaves turn yellow on the seedling material, begin to dry out, then the reason lies in the new shoots with which the seedling grows. To rectify the situation, it is enough to remove unnecessary branches or ovaries. Violations in agricultural technology are also not excluded. Experts recommend, before starting seasonal work, draw up a schedule of necessary activities, sow, plant and transplant, spray and fertilize on time.
Greens of seedlings can turn yellow from low temperatures (especially with night frosts on the ground). That is why, when planting seeds on an open bed, you need to cover it overnight with a film or agrotextile.
Seedlings are sensitive to the lack of useful trace elements, in particular potassium, and this must be fought. It is important to adhere to the timing of top dressing, so that the developing plant has enough strength and energy for normal growth.
When yellowness appears on seedlings only in a certain zone of the beds, it is rather associated with an incorrectly chosen place. The problem is most likely in the composition of the soil or in the lack of light. When growing seedlings on a windowsill, it is important to prevent the soil from drying out and direct sunlight, they can burn, light shading is required.
When growing cucumbers in a greenhouse, the moisture and temperature regime is often violated. Excessive moisture in the air and soil leads to the development of fungal diseases. The plant reacts to a deviation in the external environment with yellow leaves. At first, the tips turn yellow, then the entire sheet can be covered. You should not ignore this signal.
Normal conditions for the development of seedlings provide for a temperature in the range of 22-26 degrees. If the indicator falls below 14 ° or exceeds + 42 °, cucumber shoots stop developing, and just one degree of frost leads to death. Yellowing leaves and embryos can signal a violation of the temperature regime.
Other possible reasons include:
When growing cucumbers in open ground, the yellowness of the leaves often indicates a violation of watering: a lack or excess of moisture. In extreme heat, it is recommended to water the bushes daily (morning or evening). If the summer temperature is moderate, then it is enough to irrigate the beds 2-3 times a week. But before each procedure, it is worth assessing the condition of the soil in order to prevent stagnation of water. You should also loosen the soil in a timely manner.
If we are talking about the defeat of the plant by diseases, then the yellowness or white dots on the greenery indicates fungal infections: fusarium, pityosis, etc. The leaf does not react to watering, it remains sluggish. It is necessary to treat: it is necessary to treat with special preparations, you cannot do without it. The main thing is not to waste time so that the affected area does not spread to neighboring bushes. And there is no need to rely on folk methods, it is better to act according to science.
Yellowness or a white spot on the leaves may indicate pest infestation. Among the most dangerous parasites are spider mites, whiteflies, and aphids. Insects suck the juices from the plant, which leads to its death. In this case, you cannot do without processing the beds.
One of the rules for caring for cucumbers says that damaged areas should be removed to localize the problem. In the case of yellowing of the leaf, there is no need to rush, treatment is necessary here. To begin with, you should control the ambient temperature, soil condition. This will help identify violations and correct them.
In addition to moisture and looseness, the soil must be nutritious... Growing seedlings remove most of the microelements necessary for development from the soil. Therefore, in agricultural technology, there is a schedule for the introduction of dressings, which enriches the environment with useful substances, helps to strengthen the plant's immune system. There are two ways to introduce a beneficial substance. One is to sprinkle with the ready-made solution, the second is to sprinkle dry granules of factory production according to the instructions and pour plenty of water.
If the leaves turn yellow and dry at the edges, then most likely there is a lack of potassium and magnesium. And if green veins remain on the yellow leaf, we can talk about a deficiency of manganese and iron. In case of yellowing of the upper part of the bush, a copper deficiency is diagnosed.
To fix the situation you need to carry out complex feeding in a timely manner... Alternate organic with mineral, as well as root and foliar. Nutrient administration schedule:
It is necessary to correct the irrigation error taking into account the following factors:
To protect the plants from drying out, it is recommended to cover the beds with mulch. This will keep soil moisture longer in hot weather. In this case, you do not have to flood the plants, as a result of which a fungal disease may develop.
When choosing an irrigation system, give preference to sprinkling and drip irrigation. Dosed moisturizing will also prevent powdery mildew, root rot, and olive rot.
Organizing automated hydroponics for a novice gardener will not be possible.
In the open ground, you need to moisten the garden more often than when growing greenhouses in a greenhouse... Beginners should use watering rates per bush as a basis:
A characteristic sign of a lack of light is yellowing of the lower leaves on the bushes. It is impossible to change the landing site of developed bushes, therefore, weeding should be carried out in a timely manner so that weeds do not form a shadow. Also, during the formation of the lash, you need to take care that neighboring plants do not spread on top of each other. This will not happen if the recommended layout is taken into account when disembarking. Observance of the intervals will help to prevent the bed from becoming thick.
Temperature changes also affect the color of the cucumber leaf. It is impossible to influence nature, but it will be possible to save the plant from low temperatures by constructing a frame and covering with a film... If the climate is arid, then the planting of cucumbers should be done between corn or sunflower. Neighboring crops will scatter sunlight, prevent the formation of burns on the green.
It is often difficult to correct mistakes when yellowness is detected on the sheets, because the reasons may lie in the wrong planting of seedlings or seeds. Therefore, it is important to comply with the basic requirements at the beginning of the formation of beds:
If the garden bed is attacked by pests, treatment with insecticides and acaricides is carried out. Among the popular drugs, the following are noted:
For prevention purposes, it is recommended to follow simple rules:
before sowing, carefully prepare the soil, enrich it with nutrients in the right proportions (you should not increase the fertilizer consumption rate);
You may not even encounter the problem of yellowing if you follow all the rules of care and prevention in a timely manner. It is much easier than spending energy and nerves to restore the affected plant.
Cucumber is an extremely thermophilic crop, so its cultivation most often takes place in greenhouses and greenhouses. The close proximity of plants, as well as not always favorable conditions for growth, can lead to yellowing of the leaves of this plant. What to look for the cause of this phenomenon and what needs to be done for prevention and treatment is described below.
The main reasons for yellowing of leaves in a greenhouse:
In the video, the leaves of the cucumber seedlings turn yellow:
In addition, cucumbers are often affected by diseases and pests. The juicy stem and fruits become a favorite delicacy for many garden "newcomers", and sometimes, for effective protection, you have to use not only folk methods, but also purchased products.
Possible diseases and pests - the reason for the yellowing of cucumber leaves:
Spider mite... A small insect that causes considerable damage to plantings. In addition to special preparations, you can use a solution of laundry soap. With the help of a sponge, the outer and inner parts of the leaves, as well as the stem of the seedlings, are processed. But how to get rid of a kidney mite on currants is described in great detail in this video.
Melon aphid... Ordinary soap solution is also effective against it. Treatment can be carried out for prevention and treatment no more than once a week. And by clicking on the link, you can find out more about the gall aphid on red currants, and how to deal with it.
Root rot can also kill crops.... The factors that provoke the risk of such a disease are waterlogging and watering with cold water. "Previkur" is considered an effective remedy for combating root rot. Processing is carried out according to the instructions with an interval of two weeks. It will also be useful to learn how to spray tomatoes from black rot.
Fusarioh - a fungal disease against which most fungicides are powerless. Prevention methods are considered to be regular loosening of the soil, as well as a change in the place of growth and disinfection of the land, carried out every season.
A timely identified pest is the key to successful treatment of cucumber seedlings. At the same time, you need to know that with constant problems of a certain culture at the planting site, you may have to completely abandon the cultivation of plants on this soil.
What are the best varieties of cucumbers for a polycarbonate greenhouse, and how they are called and look, can be seen in this article.
It will also be useful to learn about what self-pollinated cucumber seeds look like for a greenhouse for pickling.
But what are the best varieties of cucumbers for Siberia in a greenhouse, you can understand by clicking on the link: //gidfermer.com/sadovodstvo/ovoshhevodstvo/luchshie-sorta-ogurcov-dlya-teplic.html
It will also be interesting to learn about how to grow cucumbers on the window in winter, and what features of cultivation exist.
Let's start with the reasons why cucumber leaves can turn yellow. And there are several such reasons:
And briefly about each of the reasons.
1. The plant assimilates liquid mixtures and complex fertilizers better.
For the entire growing season, you need to carry out 3 dressings:
In order not to "overfeed" the plants, you need to strictly follow the instructions that come with each fertilizer.
Yellow spots indicate a lack of potassium, and light green spots are a sign of magnesium deficiency. So, the cucumbers need to be fed. Yellowing upper leaves are with a lack of copper.
2. There is a misconception that the more water for watering cucumbers, the better. In fact, even a large amount of water will not save if the irrigation was not correct.
3. Such fungal diseases as fusarium or pityosis can appear due to temperature changes, and are manifested in a change in the color of the leaves on the bush. To prevent these diseases, it is worth treating cucumber bushes with "Fitosporin".
From pests such as whitefly or spider mite, will save "Antiklesch", "Fitoverm", "Apollo". Deal with fungus a 1% solution of Bordeaux liquid will help.
From aphids you can spray the cucumbers with a solution of nitroammophoska (3 tablespoons per 10 liters of water). A solution of colloidal sulfur (80 g per 10 l of water) will cope with a spider mite.
If the roots of the cucumber are eaten by pests, or they were damaged when planting seedlings in the ground, during weeding or loosening, the leaves will inevitably begin to turn yellow.
Do not thicken the planting. First, it limits the sun's rays from reaching the bottom of the plants, causing the leaves to turn yellow and die off. Secondly, fungal infections appear.
4. A sudden change in temperature or heat may cause a problem. A properly selected shady landing site or a stretched mesh that shades the landing will save you from the heat. Treatment of bushes with a solution that stimulates growth will help from a cold snap. To prevent fungal diseases from developing, regulate the humidity by ventilating the balcony or greenhouse.
Often, gardeners, when growing vegetables, are faced with the problem of yellowing foliage. Consider why the leaves of cucumber seedlings turn yellow and how to deal with it.
Causes of yellowing of leaves in cucumber seedlings and treatment methods
Cucumber seedlings turn yellow for several reasons. If the source of the problem is discovered in time, then the plant can be saved.
As the seedlings grow, they build up the root system. When the crops are thickened, the plants suffer from a lack of moisture, nutrients and space, reacting to this by wilting and yellowing of the aboveground part.
It is possible to determine from the lack of which element the sprouts suffer from by the place of yellowing of the cucumbers: along the edge - a sign of a lack of potassium, in the area of the veins - the seedlings lack magnesium.
Usually, the seedling boxes are placed on top of a foam pad, which, when in contact with fertilizers or moisture, can release toxic substances.
Harmful components cause yellowing, wilting and drying of leaves and pose a great danger to both plants and future fruits.
If the temperature in the room is below 18 °, the process of hypothermia of the soil occurs, as a result of which the plants are not able to fully accept nutrient components.
Often the reason lies in a lack or an excess of moisture - watering must comply with the norm.
Also, seedlings grown on the southern or southwestern windowsill turn yellow and curl, where the sun is especially active at midday.
But do not forget that with a lack of lighting, the seedlings will suffer no less.
Yellowness can be the cause of the appearance of fungal diseases - powdery mildew, downy mildew, fusarium wilt or root rot. Or a consequence of an attack of parasites - spider mites, aphids.
We process to eliminate fungus
Different methods of treatment are used for yellowing of cucumber seedlings.
Prevention of yellowing of cucumber leaves will be proper care and adherence to all rules of agricultural technology.
There are many reasons for the yellowing of cucumber seedlings. In order to avoid this phenomenon from the very beginning and get strong shoots, you need to follow all the rules of planting and care - then you will get a healthy and rich harvest.
For planting, you need to take only high-quality seeds - without signs of yellowing, mold, and disease damage.
First, they should be etched with a solution of potassium permanganate, and one of the biological products for vegetable crops, Albit or Gamair, should be added to the soil.
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Why do the leaves of cucumber seedlings turn yellow? Causes and Effective Solution of the Problem. Why leaves turn yellow on seedlings and how to fix it. Causes and elimination of yellowing of leaves!
[/ su_box] When planting, use spacious seedling boxes or containers with a height of at least 15 cm. To eliminate the risk of overflow, use containers with drainage holes.
The soil is disinfected, which helps to avoid pest and disease infestation. There are several methods of sterilization - calcining in the oven, spilling with boiling water or a solution of potassium permanganate.
The appearance of yellowness on the leaf blades - in the middle, along the edge, twisting of the border, wilting - all this can be caused by various reasons. Sometimes it is enough to reconsider something in the care of plants; in other cases, drastic measures will be required.
Ask and get useful advice from professional gardeners and experienced summer residents. Ask a question >>
Why leaves turn yellow and dry:
It is necessary to find out as soon as possible the reason for the change in the color of the leaves, to be in time before the dying off of the root system of cucumbers. It is expensive every day, otherwise the seedlings will be ruined, and re-sowing is a waste of time.
The following main reasons for the appearance of yellowness on cucumber seedlings can be distinguished: