Even if the leaves of the cucumbers suddenly began to turn yellow on your favorite garden, this is not a reason for panic. Usually it is just a matter of improper care, which is easy to correct. They lack sun, too hot or cold, and lack of nutrients. But the reasons can be more serious, so it is better to prepare in advance and study all the possible risks. Let's tell!
Main reasons
Cucumbers consume a lot of water, so if there is not enough water, dehydration manifests itself almost immediately. Yellowness is the first alarm that points to it. But do not water the whip in the middle of the day, because it will get sunburn in the form of yellow spots.
Also, the leaves change color due to a lack of fertilizers, and especially nitrogen. Freezing stress causes the same reaction. Another reason is damage to the roots by pests or simply mechanically during transplantation. Of course, infections and bacterial diseases should not be forgotten.
Leaves turn yellow unevenly and with spots
Irregular spots scattered throughout the leaf often indicate a fungus or infection. Sometimes these are sunburns, but if you water the seedlings correctly in the evening or early in the morning, then this possibility is almost impossible.
- Powdery mildew appears in round yellow spots with a white bloom on the back of the leaves. Over time, these same leaves will begin to darken, dry out and die off. It is completely impossible to get rid of it - the plants will have to be destroyed in the fall.
But you can contain the spread of the problem and harvest a normal healthy crop. To do this, temporarily stop watering the seedlings and after a week treat it with fungicides or special medications. Process it regularly until the beginning of fruiting, but strictly observe the dosage on the package.
- Blurry yellow spots with brown blotches indicate anthracnose. Its other symptoms are the appearance of pinkish pads on the leaves and defects on the lashes.
The edges of the leaves turn yellow in cucumbers
Usually the leaves change color and dry out at the edges - this is a natural development of the situation. The reasons can be different, so let's talk about the main ones:
- Lack of moisture in the soil and dry air cause the leaf to turn yellow and dry. It usually starts at the edges.
- The fungus also most often affects the plates from the edge. Treat cucumber seedlings with Bordeaux mixture or other preparations. Be sure to follow the dosage, otherwise you can burn the plant.
- With a lack of potassium, the leaves of cucumbers acquire a faded light green hue, starting from the edges.
Why petunia leaves turn yellow and dry
Cucumber leaves curl and deform
Deformation of the leaves, combined with their yellowness, indicates more serious and neglected problems. Don't delay and look for the reason as soon as possible!
- Curling can also be a sign of powdery mildew, which most often appears in the middle of summer.
- Check if there are aphids or spider mites on the back of the leaves!
- Leaves curl when the area is too dry - this is how the plant tries to reduce evaporation. This is a kind of natural defense mechanism.
- If the leaves of cucumbers curl up, grow poorly or stretch out unevenly inappropriately, nitrogen feeding is needed.
- A sharp burn from cold or too hot glass in the greenhouse can also have a similar effect. Young leaves of young seedlings are especially sensitive, therefore cucumbers are planted at a distance from the walls of the greenhouse.
“If all else fails, it’s likely that the whips have been affected by a virus. Alas, they cannot be cured and must be destroyed as soon as possible.
Cucumber leaves turn yellow on the balcony
On the one hand, aggressive influences from the outside are minimized. On the other hand, in the case of young seedlings in boxes, several specific factors appear.
- In a closed glazed room, the same greenhouse effect appears as in a greenhouse. Therefore, the reason may be high humidity around, so open windows regularly.
- Leaves turn yellow if the boxes and pots are too tight for the cucumbers. Young plants grow rapidly and the root system needs more space. Then you need an unscheduled transplant of seedlings.
- Be sure to follow the seedling feeding schedule before and after the pick. After the appearance of the first leaves, use mineral fertilizers with nitrogen, and before planting with potassium.
Why strawberry leaves turn yellow and dry
Cucumber leaves turn yellow in a greenhouse
The conditions for growing cucumbers in a greenhouse are slightly different from open ground. A stable regime contributes to the development of seedlings, but if something goes wrong, the situation develops even more rapidly. Let's talk about subtle greenhouse nuances:
- Monitor the frequency and intensity of watering. You will need about a bucket of water for the garden bed, meter by meter, every 3 days. In the midst of the heat - a little more often.
- Maintain a stable temperature regime, taking into account the weather outside. Until the fruits set, the optimal range is 20-24 degrees during the day and 17-18 at night. After the fruit appears, it is 21-26 and 18-20 degrees, respectively.
- Be sure to ventilate the greenhouse, because the lack of oxygen and high humidity are almost the tropics and the right way to fungus.
- If the lashes of cucumbers are planted too close, they are cramped and simply do not have enough space to grow and develop normally.
The lower leaves of cucumbers turned yellow
In any stressful situation or with age, the lower leaves are the first to suffer from old age. It is normal for a plant to first try to save those parts that can still grow and develop. This biological mechanism is inherent in everyone, not only in cucumbers.
Healthy cucumber lashes are densely covered with large leaf plates. When the sun simply does not reach the ground, cucumbers dump ballast and accumulate resources in the promising part. If you know for sure that the seedlings are healthy - don't be intimidated by the look of the lower leaves.
Leaves turn yellow at the ovary
But in this case, you need to act immediately, because the plant cannot cope on its own. Yellowing of the leaves at the ovary is an extreme symptom, and if it is missed, the crop will never appear.
- The lack of sunlight for the old lower leaves is not particularly critical. But if because of this the plates at the ovary turn yellow, they may die over time.
- The same problem with the cold, because the ovaries that turn yellow due to frost can completely die off if the situation is not quickly corrected.
- Perhaps the cucumbers need additional nitrogen-potassium feeding.
Why pepper leaves turn yellow and dry
What to do to prevent the leaves of cucumbers from drying out and turning yellow?
In the first place, always and everywhere, compliance with the conditions and rules of care. This applies not only to cucumbers, but also to any seedlings, because most of the problems arise precisely because of the downed regime.
1. When the leaves of cucumbers turn yellow from drought, it is not scary and will pass when the watering regime is restored;
2. If the problem is rotting, you urgently need to reduce moisture, loosen the soil, treat it with potassium permanganate or other antiseptics. Add sand and wood ash to quickly remove excess liquid;
3. Regularly feed the seedlings with mineral fertilizers on a schedule. Use mullein infusion, ash, herbal teas, saltpeter, soda and fermented milk whey;
4. Spray the yellowed leaves of cucumbers with a weak solution of potassium permanganate, onion peel or a mixture of milk, iodine and laundry soap;
5. Constantly examine the seedlings for pests and diseases in order to get rid of the problem as soon as possible. Do preventive treatments;
6. Never water, sprinkle or foliarize during the height of the day.
