Cucumbers in the greenhouse, the ovary turns yellow
Any summer resident will tell you that every year planting cucumbers is accompanied by one or another difficulty. Either there is no ovary, then the fruits do not grow, and sometimes the leaves begin to turn yellow and burn en masse. Indeed, cucumbers are a culture with character, but it is quite possible to adapt to it. This time we will touch on the question of why the ovaries turn yellow, and what measures need to be taken in the greenhouse to avoid the loss of the cucumber crop.
Why do cucumber ovaries turn yellow in a greenhouse?
Before we get started, let's turn to the list with the most likely causes. This will help not only find the root of your problem, but also prevent this from happening in the next season:
- Pay attention to the characteristics of the varieties planted. It is likely that the lack of pollination is the reason why cucumber ovaries turn yellow and crumble. Many varieties require artificial pollination and, as a result, the ovary is weak.
- And there are also varieties opposite that are too actively pollinated, and the plant is not able to endure such a burden.
- In a greenhouse, with improper soil care, cucumber ovaries turn yellow due to insect damage or any diseases.
- And once again, let's touch on the fact that everything needs to be done in accordance with the agricultural technique of culture, the ovary of cucumbers turns yellow and falls off often due to violation of the rules of cultivation.
Now that the range of probable causes has been outlined, you can start taking action.
The ovary of cucumbers turns yellow and falls off - what to do?
First, we will consider the most likely scenario, namely, a violation of agricultural technology. It is important to understand that this culture is very demanding on the level of heat and moisture. If the region is cold, then even in May there is a possibility of freezing of seedlings. When the temperature drop is close, it is imperative to cover the additional planting with a film. You can also fill plastic cups with warm water and place them directly on the soil to keep the temperature from dropping so much. Further, you should remember about the cucumber's love for minerals. Most often, yellowness occurs in a greenhouse where nitrogen is clearly not enough. So, before planting in the greenhouse, you need to feed the seedlings a little and thereby avoid such problems.
When your small cucumber ovaries turn yellow en masse, you can talk about a lack of pollination. If the varieties are chosen correctly, it means that the greenhouse ventilation system should be revised again and the insects should be returned. The easiest way to process cucumbers so that the ovary does not turn yellow in such a situation is ordinary sweetened water. Preparations "Ovary" or "Bud" also give good results. Your goal is to attract insects and get the highest quality pollination.
The approximate norm for the number of ovaries in cucumbers is up to 25 on each bush, otherwise they turn yellow and crumble. So "too much is good, that's also bad." If this moment is not regulated in time, the ovary can and stay, but the fruits are crooked and yellow.
And, finally, the most unpleasant option is why the cucumber ovaries turn yellow, the appearance of insects or the infection of seedlings in the greenhouse. Here are the most diverse typical for this culture: from fungal to typical for greenhouses. This is usually the case with too dense planting and poor ventilation. But the disease always begins with a leaf, therefore, for prevention, the beds should be treated with fungicides before the ovary appears and thereby protect yourself. And also adjust the moisture and planting density so that the problem does not return. When you learn to feel all of the above rules and subtleties on an intuitive level, and this comes with experience, then the harvest will be plentiful and the ovary will be healthy and strong.
womanadvice.ru
Causes of yellowing of cucumbers in the greenhouse
Everyone knows that sometimes cucumbers in a greenhouse start to turn yellow. What are the reasons for this? What can be done to get the harvest?
So why do cucumbers turn yellow in a greenhouse? There are three main reasons.
Failure to comply with the technology of growing cucumbers in greenhouses
Cucumbers are moisture-loving plants, so they need to be watered regularly.
To prevent the cucumbers from turning yellow, use cold water for watering. Defend the water. Increase watering during fruiting. In addition, you need to moisten the ground well so that the roots of the cucumbers develop inward, and not from above.
If you do not water the plants at least a few times, they will begin to turn yellow, and the new ovary will also turn yellow.
The weather is often the reason why the plant turns yellow. Because of the cold and wet weather caused by frost, cucumbers are often damaged. If the ovaries begin to rot, immediately remove the faded flowers and apply potassium permanganate to the cut. To prevent bacteriosis, spray - for this purpose, 1% Bordeaux liquid is used.
If a yellow spot appears on the foliage, this indicates a lack of potassium, and a light green one indicates a magnesium deficiency. Thus, the cucumbers need to be fed.
In addition, the development of the plant may be slightly disrupted due to the lack and scarcity of soil. Make sure that there is no overdose of fertilizer, because of which, as a rule, seedlings and their fruits turn yellow. As soon as the cucumber seedlings are planted and after the harvest has been harvested, be sure to add manure to the soil. And during the growing season, use complex mineral fertilizers (they must include phosphorus).
Fungal diseases and pests
Powdery mildew is a fairly well-known plant disease today. If the leaves are covered with light spots that gradually increase in size, then this indicates an infection. The leaves begin to dry and turn yellow. How can this trouble be eliminated? In this case, it is necessary to use fungicide preparations.
There is another common disease in cucumbers - usarium wilting. Because of this dangerous fungal disease, plants begin to die in the greenhouse. In the building where the infection has occurred, it is necessary to completely replace the soil. And it doesn't hurt to change the variety of cucumbers.
Root rot. Cucumber leaves turn yellow at the very bottom. This usually happens through significant changes in temperature, day or night. The reason is the use of cold enough water for irrigation. The weakened plant is the first to fall ill, then the infection is transmitted through the ground to other crops.
Peronosporosis - the cause of the destruction of the crop
In addition, you need to talk about downy mildew (peronosporosis). This disease, common in cucumbers, appears in a greenhouse with high humidity and soil. The affected fruit shrinks and turns yellow. Often, the entire crop is destroyed. How to understand that plants are sick? On the leaves (at the very bottom), green spots of an acute-angled shape may appear. Means for eliminating peronosporosis will help cure the disease.
Peronosporosis is the main disease of cucumbers in the greenhouse, in which the leaves begin to turn yellow.
The plant is overloaded with ovaries. In a greenhouse, plants are able to develop quickly enough. If you remove new shoots in a timely manner, you can prevent a delay in the development of greenery. But non-compliance with this rule can be the result of the appearance of underdeveloped, small and yellow fruits.
In addition, sometimes fertilization is insufficient. This happens when a hybrid variety is used in a greenhouse that requires artificial pollination.
In the greenhouse, cucumbers turn yellow naturally when they are fully ripe, but only green fruits are used for food.
http://youtu.be/MkA0MtQOvS4
These are the main reasons why greenhouse plants turn yellow. By identifying the cause, you can choose the best method for preserving the fruit.
VseoTeplicah.ru
Why do cucumber ovaries turn yellow in the greenhouse and in the open field - Onwomen.ru
Even the most experienced gardener faced such a problem as yellowing of cucumber ovaries. The completely harmless process of color change gradually becomes a serious problem, the ovaries begin to rot and soon fall off. In order to prevent such an unpleasant phenomenon, you should know the causes of yellowing, be able to deal with them and carry out the correct prevention.
Lack of light in the greenhouse
Cucumbers are a very demanding crop for lighting and are sensitive to lack of light. So if you are going to grow cucumbers in a greenhouse, then even at the stage of building the shelter, you need to think about an arrangement in which all areas will be sufficiently illuminated.
Often a lack of light in a greenhouse is associated with a large number of green spaces, which, when overgrown, become too lush and take up space from each other. Therefore, before planting cucumbers for seedlings, do not overdo it with their quantity for the greenhouse, calculate a strictly defined amount and add about 10% to this as a spare planting material.
Modern hybrid cucumbers have a strong vegetative system, which is also important to consider when planting. For example, bee-pollinated hybrids can be planted in 2-3 pieces per 1 sq. meter, and parthenocarpic ones are planted in only 1 copy per 1 sq. meter. If it is irresponsible to observe the planting rules, then the formed cucumbers will steal part of the greenhouse lighting, as a result, the ovary will turn yellow and gradually fall off.
The reason for the drying out of the cucumber ovaries may be the lack of regular pinching, which play an important role in the formation of the bush. If you do not pay attention to this in time, then the lateral branching shoots will grow and create a lack of illumination. Pinching is carried out only on the upper shoots, leaving a length of no more than 25 cm, since shoots that are too high weaken the plant and can cause yellowing and leaf fall.
A large number of ovaries
It is also important to monitor the number of ovaries formed on one cucumber lash. Cucumbers develop very quickly, especially in a greenhouse, so if more than 25-30 ovaries appear on one lash, then all flowers will not be able to form into full-fledged fruits. The plant simply does not have enough strength, as a result of which yellow and rotten ovaries will appear. To prevent this from happening, thin out the cucumber lashes in a timely manner.
Incorrect temperature conditions
When grown outdoors, cucumbers can react painfully to low temperatures. and often do not bear fruit in cold summers. It is necessary to sound the alarm if the air temperature during the day is not higher than +16 ° C, as a result, the plants become weak, and some of the ovaries turn yellow. When the average night temperature drops below + 10-12 ° C, the growing season stops, and the plant may suffer from various diseases, which provokes not only yellowing, but also drying of the leaves.
Cucumbers that grow in greenhouse conditions may be exposed to another unfavorable factor - elevated temperatures. On hot sunny days, the temperature in a heated greenhouse can reach + 32 ° C, as a result of which cucumber pollen loses its fertile qualities. The ovaries are not pollinated, they can fall off and turn yellow. You can solve the problem by regularly ventilating the greenhouse, which will allow you to adjust the temperature regime, as well as achieve the optimal level of humidity.
Lack of trace elements in the soil
Yellowing and dropping of cucumber ovaries can occur due to a lack of nutrients in the soil. And this applies to plants, both in the greenhouse and in the open field. With a strong deficit, you can lose up to half of the crop. In this case, fertilizing with zinc, boron, molybdenum, manganese, copper and other microelements will be effective. Also, during the fruiting period, it is important to provide the plant with phosphorus-potassium fertilizers. When applying manure, it is useful to add 1 tbsp. a spoonful of superphosphate, or take a separate mineral fertilizer - Solution, Kemir or Azofoska.
When there is a strong deficiency of essential substances, it is recommended to use highly concentrated fertilizers, which are produced in the form of the smallest granules. Good drugs are Brexil Calcium, Rexolin Plus, Master, and Crystallen. These are potassium-phosphorus crusts with a high content of trace elements. Also, wood ash has a positive effect on the quality of the soil, introduced in a proportion of 300 grams per 1 sq. meter.
Lack or excess of moisture
Watering during the cultivation of cucumbers should be determined by the phase of their ripening. So, during fruiting, watering should be increased, and before fruiting, the intensity of watering should be reduced. However, at all stages of maturation, the soil must be sufficiently moistened. You should never water cucumbers with cold water, this can provoke a sharp and strong fall of the ovaries.
By the way, many gardeners use the watering procedure to implement one dacha trick: during the period of flower setting, cucumbers are not watered for a long time, this dries up the soil and contributes to the appearance of more female flowers.
For watering cucumbers, it is recommended to use only cool or warm water, on hot days it is better to water in the morning, and in cool weather during the day. In wet, humid weather, the ovaries may turn yellow, they need to be removed, and the cut sites should be treated with a weak solution of potassium permanganate.
Low pollination by bees
Ripening of healthy, high-quality fruits depends on the activity of bees, which pollinate the cucumber ovaries. But, unfortunately, they do not visit the beds with a green vegetable in rainy weather, and on hot days they do not fly into a stuffy greenhouse heated by the sun's rays. If the temperature reaches +35 degrees, then even if the bee pollinates the flower, it will still not be able to bear fruit. As a result, the sterile ovary will begin to dry out, and then completely fall off.
Bacteriosis
A common cause of ovary rotting and falling off is a disease such as bacteriosis. It spreads in the beds with cucumbers due to the high humidity of the soil and air, as well as when the plants are too densely planted. Also, the disease can appear on soil poor in microelements, with frequent temperature fluctuations and violations of the conditions of care.
The next reason for bacteriosis lies in the cultivation of cucumbers in the same garden for many years. One of the main rules of agricultural technology is to change the location of the crop every few years or even every year. Infected soil is very difficult to clear of infection, it is much easier to plant cucumbers in a new place. Preventive measures to combat bacteriosis are considered to be spraying cucumber plantings with a 1% solution of Bordeaux liquid or a 0.4% solution of a suspension of copper oxychloride. After the spraying procedure, cucumbers begin to develop quickly and fully.
Before starting the fight against yellowed and falling off the ovaries, you need to know one more thing. Cucumbers always form ovaries with a reserve, that is, some of them usually lack nutrients, therefore, after pollination, such ovaries can turn yellow and fall off. Do not worry, since these are extra ovaries, which the plant specifically gets rid of in order to direct all its forces to the remaining fruits.
OnWomen.ru
Why does the ovary turn yellow in cucumbers?
Vitaly Chusov
The most common cause of cucumber ovary rot is bacteriosis, the spread of which is facilitated by the increased humidity of the soil and air, as well as the high density of the plant in the greenhouse. However, there may be other reasons associated with non-compliance with agricultural techniques and non-fulfillment of optimal conditions for normal growth and development of plants: sudden changes in air and soil temperatures, improper formation of plants, lack of trace elements, etc.
The cucumber cannot be grown in a permanent culture, that is, every year in the same place, the infection accumulated in the previous year (s) can cause illness in the current season.
A crucial moment when growing a cucumber in a greenhouse - watering the plant should be watered regularly and often (especially during fruiting), and only with warm water: in cold weather - in the daytime, in sunny weather - in the morning, and on a hot day, you should use refreshing watering, in the evening, normal.
If the ovaries of the cucumber begin to rot (most often this happens in damp cold weather), you need to carefully remove the faded flowers, treat the place of the cut with a solution of manganese-sour potassium.To prevent bacteriosis, cucumber plants can be sprayed with 1% Bordeaux liquid or 0.4% - a suspension of copper oxychloride.
It should not be allowed that more than 20-25 ovaries develop simultaneously on one plant. Greenhouse cucumbers grow very quickly. Some varieties and especially hybrids of cucumber, for example, can have more than 150 ovaries on one plant at the same time. All newly formed shoots, even those with female flowers, must be removed in time, because young ovaries retard the development of forming greens and small, non-marketable fruits often grow, which quickly turn yellow and deteriorate.
The reason for the dropping of buds, flowers and ovary may be a lack of trace elements. At the same time, the productivity of plants is reduced by up to 50%. The deficiency of trace elements is especially felt in greenhouses, where mineral fertilizers (nitrogen, phosphorus, potassium) are constantly applied. Therefore, systematically (once every 3-4 years) it is necessary to introduce micronutrient fertilizers containing boron. copper, manganese, zinc, molybdenum, etc. With a deficiency of trace elements, you can use highly concentrated preparations produced in the form of microgranules (Rexolin, Brexil), as well as apply fertilizers master, crystalline, terraflex containing NPK with a complex of trace elements. The deficiency of trace elements can be replenished by adding wood ash (300 g / m2) to the soil. It is a complex nitrogen-free fertilizer containing potassium, phosphorus, silicon, lime, iron, magnesium, boron, manganese, zinc, molybdenum, cesium. However, it must be remembered that ash cannot be mixed with nitrogen fertilizers [ammonium nitrate, ammonium sulfate], which include ammonium nitrogen. Under the influence of potash contained in the ash, ammonium is released from these fertilizers, which turns into a gaseous state [ammonia] and evaporates uselessly.
In addition, the cause of yellowing of cucumber ovaries in the greenhouse may be their poor fertilization. Since the pollen of cucumber flowers is sticky, they are pollinated by insects, mainly bees. In small greenhouses, plants can be pollinated manually, but in large ones you need to put hives with bees, since manual pollination of flowers is very laborious and drastically reduces the quality and quantity of cucumber harvest.If it is not possible to put hives in greenhouses, you can lure bees by feeding them sugar syrup with the addition of 5% yeast (yeast with syrup is boiled to avoid fermentation). The syrup is prepared from 2 teaspoons of sugar and 1 teaspoon of water and poured daily into the feeding troughs for 100-200 g. syrup. It is very important to remember that pollination of a cucumber takes place from 6 to 10 in the morning, it is at this time that the maximum access of bees to the plants must be ensured (open transoms, doors, etc.).
From agrotechnical techniques that contribute to the best bee pollination. practice not thickened p
Igor komukak
A lot of sun and little water and sand in the ground
Rinat ********
Water on time and don't overheat! The greenhouse (greenhouse) must be ventilated!
Anat
The temperature regime in the greenhouse is not observed - it is too cold or vice versa
too hot. Lack of moisture in the soil. Ventilate the greenhouse often.
Igor Moldovanu
Watering with cold water, no pollination, lack of nitrogen.