5 reasons why the leaves of cucumbers turn yellow, tell us what to do?
Yellow leaves are the first sign that cucumbers are ill. But before you begin to deal with the symptoms, you need to find out the cause of the color change of the leaves. And already depending on it, select the right drugs and carry out the necessary activities.
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In our article, we will talk about why the leaves turn yellow in cucumbers, whether it is always bad, and also about ways to prevent and treat the plant.
The main causes of yellowing
Often the color of leaves on cucumber bushes changes due to adverse climatic conditions. In this case, the reason can be both in too strong a heat, and in a sharp temperature difference.
In calm weather, direct sunlight overheats the leaf plates and leaves burns on them. Especially often this happens if you pour cucumbers in the heat and allow drops of water to fall on the plant.
Fluctuations in temperature also often cause the development of fungal diseases.
Alas, you cannot fight nature in any way. But you can help plants survive adverse conditions. If a sharp drop in temperature is expected, treat the cucumbers with a growth stimulator or "Fitosporin". You can also cover spanbond plantings.
Cucumbers are very fond of moisture, but they need to be watered, carefully observing the irrigation regime.
- Do not use cold water from the water supply.
- It is necessary to water in the morning or in the evening.
- Water should be poured under the root, trying to avoid moisture on the leaves and stems.
IMPORTANT! Try to water the cucumbers regularly and with approximately the same amount of water.
So that the cucumbers do not hurt, the leaves are green and the stalks are strong, there must be at least 3 basic dressings:
- When 2 real leaflets appear.
- During the time when the plant blooms.
- When the fruits begin to be tied.
Cucumbers prefer liquid complex formulations and mixtures. They are better absorbed by the plant.
Experienced gardeners recommend using infusions of weed herbs or herbal tea as a fertilizer during the fruiting period. Such top dressing has a good effect on fruit setting and does not negatively affect the taste of cucumbers.
An excess of trace elements is even more dangerous for cucumbers. Therefore, plant nutrition should be carried out exactly following the instructions on the packaging of fertilizing.
Diseases and Pests
The discoloration of the leaf plates is a consequence of pitiosis and fusarium. These are fungal diseases in which dark spots first appear, and only then does complete yellowing occur.
The fungus usually appears after a temperature difference. Therefore, for prevention, treat plantings "Fitosporin".
Among the pests, the main enemies of cucumbers are spider mites and whiteflies. These insects feed on plant juices, which causes yellowing and wilting of foliage. To get rid of pests, use drugs Fitoverm, Antiklesche, Apollo.
Why the lower leaves turn yellow
Sometimes yellowing of the leaves is not a sign of a serious illness or lack of trace elements. For example, the lowest leaves on bushes can change color for completely natural reasons.
If the plant has a good harvest, then there is nothing wrong with yellowing the lower leaves. This means that all energy is spent on the growth and formation of new fruits. Also, the color of the leaves changes in late summer. But this is a manifestation of the natural aging process of a living organism.
What to do?
First, make sure that the fertilizer schedule is being followed. Feed the plants if necessary.
Secondly, tear off and burn all the yellowed leaves. Then treat the bushes with fungicides. Also, to combat the fungus, you can use the infusion of garlic (50 g per 1 liter of water).
Why ovaries turn yellow
The color change of the ovaries is most often found in those varieties that grow in greenhouses. There are several reasons for this:
- No stepsoning and formation of bushes. The plant forms an excess of green mass. And, it turns out that sunlight just does not reach the ovaries.
- Feature of the hybrid. Varieties that produce high yields are not able to provide nutrition for all the ovaries. Therefore, the plant gets rid of some of them. If a small part of the ovaries falls, then there is nothing to worry about. This is a natural process.
- Pollination does not occur. Usually parthenocarpic hybrids of cucumbers are planted in greenhouses, but sometimes varieties requiring pollination are also found.
- Violation of the watering regime and feeding schedule. You need to apply fertilizer for cucumbers every 7 days. During flowering and fruiting, potassium-phosphorus preparations need to be fed.
- Temperature changes. It is very hot in the greenhouse during the day, but at night the temperature can drop quite strongly. Because of this difference, the ovaries of the cucumbers may turn yellow. To prevent this from happening, close the greenhouse and the greenhouse at night. In addition, temperature differences contribute to the appearance of the fungus, due to which the ovaries also turn yellow.
What to do?
Attract pollinator insects. Leave the greenhouse open for a day, spray with sweet water.
In case of a lack of potassium, treat plantings "Mortar", Kemira or a solution of ash and calcium nitrate (3 tbsp.spoons of ash + 10 g of saltpeter per 10 l of water).
To avoid overheating, mulch the soil under the cucumbers. This technique will also help in the fight against root rot.
If the plant is sick, then treat it in a timely manner. "Fitosporin" and do not forget to pick and destroy damaged leaves. So you prevent the further spread of the fungus.
Why leaves turn yellow in open ground
Outdoor cucumbers are exposed to many negative factors. Determining why the leaves turn yellow is quite difficult. This may be the result of hypothermia, exposure to direct sunlight, infection with a fungus or lack of nutrients.
What to do?
First of all, follow the rules for the care of cucumbers.
- Irrigate with warm water under the root. You need to water cucumbers regularly. This is best done in the morning or evening.
- Cover plantings during temperature changes. So you protect the plants from hypothermia.
- Spend regular feeding and preventive treatment against diseases and pests. It is especially important to apply fertilizer during flowering and fruiting.
Why do cucumber leaves turn yellow in a greenhouse
Most often, the leaves of cucumbers growing in greenhouses turn yellow due to improper care:
- The greenhouse is not aired.
- Bushes are not formed.
- Thickened landing.
All this in a complex becomes the cause of yellowing of the foliage and decay of the lashes of the plant.
What to do?
Airing and pinching are two of the most important procedures that will protect your plantings from rot and the development of fungal diseases.
Leaves turn yellow and curl.
First of all, do a thorough inspection of the back of the leaves. Make sure there are no pests. Leaf curl is one of the main signs of the appearance of a spider mite.
Next, pay attention to whether the plant is affected by the fungus. If the leaves simply turned yellow without gray or white spots, then there is no fungus.
What to do?
If signs of a fungal disease or pests are found, plantings must be treated with fungicides and insecticides.
IMPORTANT! When affected by a fungus, infected leaves must be cut off and burned.
The border of the sheet or its edge turns yellow
Yellowing of the leaf edge without the formation of yellow spots on the leaf plate itself indicates a lack of potassium.
What to do?
Feed the plant with potash fertilizers. It is best to use liquid preparations with a complex of beneficial elements.
Why cucumber seedlings turn yellow
The reasons for the yellowing of seedlings are basically the same as in adult cucumbers. You can add to them too tight containers for germination and high humidity in the room.
- Seedlings need space so that the seedlings have sufficiently developed roots for transplanting into open ground or a greenhouse. If too many plants sprout in one container, then due to cramped conditions they will gradually begin to turn yellow.
- High humidity in the room causes the appearance of fungus.
What to do?
If the seedlings are crowded, it needs to be transplanted into larger containers. But still try to select a container of the right size in advance.
If humidity is high, ventilate the room regularly.
IMPORTANT! When airing, make sure that your cucumber seedlings are not in a draft. From him, she can easily die.
The fight against yellowing folk remedies
To combat the yellowing of leaves in cucumbers can be folk remedies without chemistry.
If the cause of yellowing is a lack of nutrients, then use the following infusion.
Take 300 g sifted ash, 200 g dry mullein, mix and pour a bucket of water. All must be thoroughly mixed to a homogeneous consistency and left to infuse for 24 hours. Top dressing is carried out at the rate of 1 liter of solution per 1 cucumber bush. Multiplicity of processing - 1 time in 7 days.
If the cause of yellowing of the leaves is due to infection with a fungal disease or aphid invasion, then use the following recipe.
Wash affected leaves with a mild soap solution from laundry soap. Then sprinkle the affected areas with ash. A similar treatment should be carried out until the bush is completely improved with an interval of 3 days.
Another, more powerful tool is prepared from natural soda. 1 tbsp. a spoon should be diluted in 5 liters of water. Processing plants using a spray gun. This tool should be used very carefully and only with severe infection. In no case do not exceed the indicated dosage. Otherwise, you simply “burn” the leaves.
How to treat with drugs?
If folk remedies do not help, then use specialized drugs.
The most effective remedies for yellowing leaves in cucumbers are "Metronidazole" and Fitosporin. Both drugs must be sprayed onto the plant. The proportions for the preparation of the composition are indicated on the packages. We advise you to follow the instructions so as not to harm the cucumbers even more.
If yellowing has just begun, then you can try to save the plantings with potassium permanganate. To do this, prepare a 1% solution and spray the affected leaves with it.
If you are sure that the reason for the yellowing is a lack of nutrients, feed the bushes with a complex nitrogen-phosphorus-potassium fertilizer.
In order to prevent yellowing of the leaves, it is recommended to carry out preventive treatments for planting cucumbers.
The most effective are solutions based on milk and rye bread.
Milk Solution Processing
This tool protects cucumbers from the appearance of insect pests and fungus.
The composition is prepared as follows: in 8 l of water, it is necessary to dissolve 0.5 l of milk (preferably 2%), 20 g of laundry soap and 20 drops of iodine.
Processing is carried out with an interval of 10 days.
Solution processing on rye bread
The tool helps against pests and plays the role of additional foliar dressing.
The composition is prepared as follows: 500 g of rye bread is soaked in a bucket of water for 12 hours. Then the sour crumb must be ground until it turns into a thick, homogeneous mass. After that, 40 drops of iodine are added. The composition is again mixed to a homogeneous consistency. Next, the resulting thick liquid must be filtered to separate the remaining bread from the liquid.
Processing the resulting solution should be carried out every 2 weeks.
Yellowing leaves in cucumbers is an unpleasant but reversible process. Most often, it is associated with the fact that the plants were poorly looked after.
Pour cucumbers with warm water on time, feed the bushes with complex fertilizers and prevent thickening of the plantings. In this case, the leaves of the cucumbers will not turn yellow, and you will get a plentiful harvest of delicious, crispy fruits.