Causes of falling and yellowing of cucumber ovaries in a greenhouse

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Many people face various problems when growing vegetables. Some summer residents are interested in why cucumber ovaries fall in a greenhouse. They try, take care of the plants, create seemingly ideal conditions for them, and still the cucumbers turn yellow and fall off. There may be several reasons. We'll take a closer look at each of them.

Causes of falling and yellowing of cucumber ovaries in a greenhouse

Violation of the light regime

Cucumbers, like many other plants, are demanding on the amount of light. Its lack leads to problems with the development of the bush. If you are going to grow a vegetable in a greenhouse, you need to collect information in advance on how to install it correctly so that the lighting is complete.

When planting other vegetables in the greenhouse, it is worth remembering that some can interfere with others with their shadow. Do not repeat the mistakes of other summer residents who seek to fit as much as possible into the greenhouse. Before planting in the ground, consider how much seedlings you need. Remember that the vegetative system of cucumber hybrids is well developed, so you need to correctly calculate how much area each bush will need. It is recommended to plant one to three sprouts per square meter. Exceeding this norm can provoke the fact that the plants will shade each other, and in the future you will notice that the cucumber ovaries turn yellow and fall off.

Do not forget about the need to pinch the top of the shoots. If this is not done on time (while the shoots are still small - up to 20-25 cm), the ovary may also begin to fall off due to a lack of light.

Temperature violation

Remember that greenhouse cucumbers are temperature sensitive. The optimal values ​​are as follows:

• before fruiting, when the weather is clear - from 22 to 24 degrees;
• before fruiting, when the weather is cloudy - from 20 to 22 degrees;
• before fruiting, at night - from 17 to 18 degrees;
• during fruiting, when the weather is clear - from 23 to 26 degrees;
• during fruiting, when the weather is cloudy - from 21 to 23 degrees;
• during fruiting, at night - from 18 to 20 degrees.

Please note that for varieties that are pollinated by bees, the temperature should be slightly higher - by 1-3 degrees.

If the temperature is higher or lower than normal, the plants begin to dry out or overcool, respectively. Sudden temperature changes also negatively affect the development of cucumbers. Most often, this problem occurs in greenhouses, where the air heats up during the day, and at night it becomes abruptly cold. To adjust the temperature regime, we advise you to use the following methods.

How to raise the temperature

To increase the temperature in the greenhouse:

1. Cover the cucumbers with another layer of plastic in the evening and leave it overnight. A distance of 2 to 5 centimeters should be maintained between it and the main shelter. Due to this, the temperature will rise by about 2-4 degrees.
2. Use foam wrap to protect the walls.
3. You can cover the ground with black film.
4. Use heaters.

How to lower the temperature

To reduce the temperature in the greenhouse:

1. Take care of good ventilation. This will reduce the temperature by 10 degrees.
2. Water the bushes in the morning with plenty of water.
3. Reed mats and shields will help. They should be painted white. They serve as protection against infrared radiation.
4. Film shelters can be sprayed with various solutions, for example, chalk, clay or flour.

Lack of minerals

Ovaries can fall off due to lack of minerals

The ovaries turn yellow and crumble when the soil lacks nutrients and the cucumbers were not fed on time. Unbalanced fertilizers or an excess of fertilizers have a negative effect on plants. Watering in large quantities leaches potassium and nitrogen from the soil, so you need to take care of adding these substances first. Plants should be fed every 7-10 days.

How to deal with the problem:

• reduce or eliminate manure use;
• spray plants with a solution based on urea and wood ash;
• use special drugs that can be purchased in stores;
• fertilize the soil with wood ash.

High yield of hybrids

It would seem that this is a big plus. But, unfortunately, this characteristic can also play a negative role in the development of plants. Since an ovary, or even several, is formed in almost every sinus, the plants do not have enough nutrients. Then the extra ovaries of cucumbers fall off. In order not to overload the cucumbers, remove the ovaries yourself - before the flowers appear. However, if you see that a small number of ovaries turn yellow, you can not interfere with the process, this means that the plant itself takes care of the optimal amount of fruits, and discards the excess.

Violation of soil moisture

Special attention should be paid to watering. Before fruiting begins, you need to water the cucumbers in moderation, and then its intensity should be increased. The soil in the greenhouse must be sufficiently moist. But remember to keep a balance. Both lack and excess of moisture have a detrimental effect on the plant. Use the following guidelines:

1. Do not pour cold water over the cucumbers. Sometimes because of this, the ovary falls off.
2. Use warm water that has been infused. If the weather is hot, it is better to do this in the morning, if the air is cool - during the day.
3. When flowers start to set, take a break from watering for a few days. Thanks to this, there will be more female flowers.
4. Before flowering, water the bushes every 5-7 days, and after the start - every 2-3 days.

Insufficient pollination

This situation may arise due to unfavorable weather conditions. Bees do not fly if the weather is cloudy. If cucumbers are grown in a greenhouse, insects fly there extremely rarely, they do not like the stuffiness and heat inside the structure. Some modern varieties of cucumbers are self-pollinating, in such cases, of course, there will be no problem. The same cannot be said about the traditional varieties of these vegetables. If the female flower is not fertilized, the cucumber ovaries fall off.

The ways out of the situation can be as follows:

1. You can pollinate the flowers yourself. To do this, you can gently fan a female flower with a previously plucked male one. Another option is to transfer pollen from the male flower to the female with a brush.
2. Another tip that can help is attracting bees. To do this, spray the cucumbers with a honey solution.
3. The easiest option is to grow self-pollinated cucumber species.

Bacteriosis

If the ovaries turn yellow, this may be a sign of this unpleasant disease. The reason for this phenomenon is often an excess of moisture in the air and soil.And also the disease can develop due to the fact that the cucumbers are planted too close to each other.

The cause of the disease can also be temperature drops, barren land. Spots appear on the leaves that turn brown, dry out, and because of this, holes appear in the leaves.

Conclusion

If you followed all the recommendations for caring for the bushes, and the ovaries still crumble and the cucumbers disappear, the plants may have been affected by a viral disease or you had poor-quality seeds. We hope that you will not have to face such a problem, and the cucumbers will delight you with an excellent harvest!