Does the onion turn yellow? Do not despair!

Many gardeners grow onions in their beds. Unfortunately, this healthy vegetable is sometimes a hassle for its owners. One of the signs of a dysfunctional onion is the yellowing of the leaves. Before taking on treatment, it is necessary to correctly establish the cause of the disease: it can be caused by pests and diseases, adverse weather conditions or poor care. It must be remembered that there is an effective treatment for any case!

Causes of yellowing onions

Onions ripen by autumn, so yellowing at the end of August is a normal physiological phenomenon. But if the green feathers begin to turn yellow in spring or summer, this is a sign of improper development of the culture.

The reasons for this unpleasant phenomenon can be very different. The tips of the feathers quickly turn yellow in unfavorable weather, both too hot and excessively rainy. In addition, onions may turn yellow due to improper feeding; attacks of pests and some diseases.

Depending on the reasons listed, there are various ways to combat yellowing onions.

Why onions turn yellow - video

What to do if the reason for yellowing is weather conditions

Weather conditions are the most unpredictable cause of potential bow problems. Even the most experienced gardeners cannot predict in advance how the weather will change.

Only a greenhouse can guarantee protection against changes in humidity and temperature - in it the onion feathers will always remain green

Greenhouse-grown onions usually do not turn yellow

If you grow onions outdoors, you need to be especially careful about the watering regime. In hot and dry weather, onion tips can turn yellow from lack of moisture. In this case, it is necessary to immediately water the plantings and then, during the dry period, watering every 3-4 days.

Onions require frequent watering with heated water

Onions generally love frequent watering. To avoid yellowing, young plants (the period of emergence and young leaves) of planting should be watered 2 times a week, and then about 5 times a month (if the weather is not too dry).

It is not recommended to use cold well water for watering onions: it must be collected in advance and left to bask in the sun.

Irrigation rate is 6-8 l / m2... After waiting for the soil to dry slightly after watering, be sure to loosen it.

In rainy weather and excessive watering, the onion rots from the rhizome. When the stems turn yellow, this means that the bulb is already completely spoiled and it is no longer possible to save it - it is better to immediately dig up all the spoiled plants.

What to do if onions lack nutrients

Lack of nutrition is one of the main causes of yellowing onions. The lack of nitrogen especially affects the appearance (onions are especially picky about its content in the soil). The growth of the leaves slows down, they become short and thick in shape, at first light green, and then yellowing. If measures are not taken in a timely manner, the feathers will dry out, and after them the bulbs will also die.

When such signs appear, it is necessary to immediately apply nitrogen fertilizers to the soil. A good feeding is a solution of organic and mineral fertilizers: 1 glass of mullein or chicken manure infusion and 1 tablespoon of carbamide are taken in a bucket of water.

Keep in mind that pathogens of fungal diseases can enter the soil along with organic fertilizers.

Despite the fact that nitrogen is the most important nutrient for onions, its excess can lead to disastrous consequences - the bulbs rot right in the soil. Therefore, when applying nitrogenous fertilizers, it is necessary to adhere to the dose recommended for this variety.

The use of ammonia with a lack of nitrogen

Liquid ammonia is ammonia, or rather, its solution of 10% concentration. It contains nitrogen, so ammonia is quite suitable for feeding onions, especially since the ammonia solution is well absorbed by plants. True, the use of ammonia is a rather expensive pleasure, but if there are no other suitable substances at hand, then it will help you well to cope with the problem of yellowing of onions.

To feed onions, ammonia is diluted in water (55–60 ml per 8–10 l) and the beds are watered (it is better to do this in the evening).

Feeding onions with ammonia - video

In addition to providing nutrition for onions, ammonia improves the structure of the soil and helps to reduce its acidity. Another advantage of this product is a pungent odor that repels almost any pest.

According to the author (supported by his own experience), the key to the success of onion cultivation is planting in fertile soil. If you work hard to prepare a garden bed in the fall (put rotted chicken droppings or mullein in it and dig it up well), and feed the plantings three times during the season, you will not need to fight the yellowing of the feather. By the way, feeding should be carried out only during the period of growing leaves, and 2 months before harvesting, completely stop fertilizing.

How to deal with pest yellowing

Despite its burning juice, onions very often fall prey to various pests that can cause not only yellowing of feathers, but also the death of the crop. The most active destroyers of onions are the onion fly, onion moth, onion thrips, lurker (weevil), and stem nematode.

Onion fly

This pest resembles a common fly in appearance. It actively reproduces in April - May, just when the green onions are developing. The fly lays eggs on the surface of the stem, in the soil near the plants and under the leaves. After 8–10 days, small white larvae emerge, which penetrate the bulb and eat the scales. In affected plants, growth slows down, turns yellow, withers and, finally, leaves dry out.

To know for sure whether the fly is the cause of the yellowing, you need to dig out the ground and see if there are white worms on the bulb.

Onion fly is one of the most common onion pests

For the prevention of fly damage, the planting material must be soaked in a solution of potassium permanganate. To combat the pest, you can treat the beds with Mukhoed, Aktara, Kreotsid PRO or Kapate Zeon. However, the use of chemicals can reduce the quality of the crop.

There are also folk remedies for pest control:

  • carrots or parsley are planted next to the onion beds: their smell scares off the onion fly;
  • introducing a mixture of ash with tobacco, pepper and mustard into the soil to prevent damage;
  • pollinate plantings with a mixture (in equal proportions) of ash and tobacco dust. You can water the beds with tobacco infusion (0.2 kg of tobacco should be poured over 2.5-3 liters of hot water and infused for 3 days, then bring the volume to 10 liters), to which, before use, add 1 tablespoon of laundry soap and red pepper;
  • watering the soil with a solution of salt with ammonia (200 g of salt and a little ammonia are dissolved in a bucket of water). This solution does not work very well on the soil, so it often should not be used. You can simply use an ammonia solution, prepared in the same way as for feeding: it is watered between rows during periods of maximum onion fly activity (twice in June and twice in July). After each watering, the soil needs to be slightly loosened.

To get rid of onion flies, the author successfully used a mixture of ash (1 glass), black or red pepper (1 tablespoon) and makhorka (1 tablespoon). This composition requires pollinating the beds. Before processing, all yellowed leaves are removed completely.


If your onion leaves become wrinkled and covered with yellowish veins, then most likely you will find a nematode in the stems - whitish filamentous worms. They suck the juice from the stems, penetrate into the bulb, causing cracking and rotting of its bottom. It is difficult to get rid of the nematode - it can live in the soil for many years.

Leaves affected by a nematode are deformed

To prevent damage, the planting material must be carefully processed (with hot water at a temperature of 40–45 aboutC, and then with a strong salt solution for 15–20 minutes), and in the fall (after harvesting) process the soil with Heterophos, Carbation or Tiazon. It should be borne in mind that these drugs are toxic and the waiting time after using them is at least 2 months.

Folk remedies for nematode control include:

  • planting in the aisles of calendula or marigolds (its phytoncides scare off pests);
  • feeding the beds with marigold tincture: the plants chopped with a knife are folded into a bucket (filling it up to half), filled with water heated to 50 degrees and left under a lid for two days;
  • feeding with ammonium sulfate (first half of June) - dissolve 2 tablespoons of the drug in 10 liters of water and water the beds at a rate of 4–5 l / m2;
  • watering with a solution of sodium chloride (a glass of coarse salt for 10 liters of water).

Stem nematode - video

Onion moth

Onion moths are similar in appearance to other species of moths. This pest activates when the weather is warm and dry. The moth lays its eggs in the ground near the bulbs. The emerging larvae penetrate the leaves and gnaw them from the inside. The feathers of the affected onion change color and dry first in the upper part, and then whole. The first wave of defeat is observed in May - June.

Onion moth larvae take root in leaves

Metaphos and Iskra are effective chemical means of protection. From folk remedies, processing with ash, tobacco dust, garlic or tobacco infusion is popular.

Onion or tobacco thrips

Onion (tobacco) thrips also often cause yellowing of onions. These small (smaller than aphids) insects, like aphids, suck the juices from the plant. They overwinter in soil and bulbs, so they can appear even in well-cultivated areas.

Despite its small size, thrips can inflict great damage.

For prophylaxis, onion sets must be treated with hot water (10-12 minutes), and then immersed in cool water. If infection of plants in the beds is detected, treatments with Iskra and Konfidor will help.

Sticky traps can be installed in the beds to assess (and reduce) the extent of thrips infestation. It is desirable that their paper base is yellow or blue - these colors attract insects. If the infection is not too strong, you can use folk methods of struggle:

  • process the plants with garlic or onion infusion (a tablespoon of chopped raw materials is poured with a glass of hot water and insisted for a day);
  • use tobacco infusion for processing, aged 36 hours and diluted twice before use;
  • spray the planting with a decoction of dried pomegranate, lemon and tangerine peels (0.2 kg), yarrow (70-80 g), ground red pepper (10-12 g) and crushed garlic (2 cloves).

Onion Weevil (Lurker)

Weevil larvae feed on the feathers of green onions. The first sign of damage is the yellowing of the feather, and then its wilting and the death of the plant. If you do not take up the fight in a timely manner, the entire garden bed may die. You need to carefully examine the plantings: if stripes appear on the green feathers, cut the feather - most likely, a weevil larva lurks there. The chemical means of control is Karbofos, which should be sprayed on the plantings (then green onions cannot be harvested for 2-3 weeks).

Other methods of dealing with weevils are:

  • manual collection of beetles;
  • watering the beds with ammonia solution (50 ml of ammonia per bucket of water) every 7 days starting from mid-June;
  • cleaning and burning of all plant residues from the garden in the fall;
  • sprinkling the beds in spring with ash, ground pepper or mustard.

Fungal diseases of onions that cause yellowing

Of the diseases of onions, yellowing is most often caused by fungal diseases: rot of the bottom, fusarium, rust. The main prevention method is to carefully select healthy seedlings and soak them in hot or salt water. The landing site should be sunny and well ventilated. Excessive soil moisture should not be allowed; it is also necessary to deal with pests that often carry diseases. Observance of crop rotation is not the last place in the prevention of diseases.

Before planting, it is advisable to treat the site with a HOM preparation - then the likelihood of a yellow feather appears.

It is not advisable to treat diseased plants with pesticides, because after them you cannot eat the feather for a long time. You can use Trichodermin (sevok is soaked in a suspension of 10 g / l of the drug), as well as Fitosporin-M or Gamair (plantings are sprayed with these drugs). These fungicides are biological products and do not harm human health.

Effective against yellowing of feathers caused by diseases, Metronidazole. A solution of 2 tablets per 5 liters of water should be watered over the beds (the norm is 4–6 l / m2).

Prevention of yellowing of onions

Instead of determining the cause of the yellowing of the onion, choosing the right drugs and eradicating the problem, it is better not to allow this situation at all. If you treat the soil in a timely manner, correctly water and fertilize and regularly fight pests, then yellowing will most likely not occur (unless due to unfavorable weather). For prevention, you must adhere to the following rules:

  • annually in the fall, having harvested the crop completely, you should carefully dig up the site. The depth of processing should be at least the length of the shovel bayonet;
  • observe crop rotation - onions can be planted in the same place only once every 4 years, cereals are desirable as a predecessor;
  • for planting, use only high-quality planting material and properly prepare it (warm up and dry before disembarking);
  • to exclude diseases before sowing, disinfect the soil with copper sulfate (1 tablespoon per bucket of water);
  • to carry out feeding strictly in accordance with the recommendations: excessive doses of fertilizers are just as harmful as too small amounts of them;
  • ensure proper watering: it should be regular, but moderate;
  • to eliminate foci of diseases, remove and burn all diseased or infected plants by harmful insects.

Yellowed onion feathers are not a joyful sight for the gardener. However, adherence to simple rules of agricultural technology almost always helps to prevent this trouble, and if it has already happened, there is always a way to restore the health of the onion beds.

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Hello! My name is Maria, 40 years old. My main job is teaching technical subjects.

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What to do to prevent the onion from turning yellow in the garden

Many gardeners, especially those who are just starting to produce food, ask themselves a completely logical question: what to do so that the onion does not turn yellow? How can the current situation be corrected in the shortest possible time?

  1. Why do onion leaves turn yellow
  2. Feather yellowing due to drought
  3. What to do in such situations
  • Pests provoking the yellowness of onions
  • Tobacco thrips
  • Onion moth
  • Onion fly
  • Stem nematode
  • Lack of nitrogen
  • How to make a solution
  • Diseases of the onion plant
  • Conclusion
  • Many diseases of garden crops, including onions, are subject to this ailment. Yellowing is not temporary. And if you do not pay enough attention to such symptoms, you can ruin the entire crop.

    Substances contained in onions

    Onions contain a complex of vitamins (groups B, C, E, PP) and mineral components (fluorine, iron, potassium, iodine, zinc, phosphorus, calcium, sodium), quercetin, sulfur, phytoncides, sugars (inulin, glucose, fructose) , pectin compounds, flavanoids, dietary fiber, saponins, essential oils, tannins, antioxidants, organic acids. Thanks to such an impressive list of phytonutrients, onions should be classified as biologically active products used to heal many breakdowns in the body.

    A pungent taste and a rather pungent smell (up to tearing when cutting a root crop) is determined by the presence of allicins - essential oils with a high sulfur content. Phytoncides (a volatile constituent of essential oils) exhibit powerful antiseptic, antiviral and antimicrobial properties. One chopped onion is enough for a whole room to clear the air in the room of most protozoa, infections, viruses and bacteria, as well as microscopic fungi.

    Folk remedies to combat yellowing

    First you need to find out the reason why the onion tips dry, and only then think about how to water or process the garden. If this happened due to insufficient soil moisture, irrigation should be increased.

    Tincture of mint, wild rosemary, pine needles and valerian will help scare off pests. It is advisable to alternate the onion beds with carrots, marigolds and calendula. Pests cannot tolerate the aroma of these crops.

    Folk remedies used if the onion turns yellow:

    • To prepare the drug, 10 liters of water are heated, 100 g of salt, an ampoule of ammonia and 2 glasses of wood ash are added to it. The solution is treated with a bed no more than once every 10 days.
    • If the onion feather turns yellow, the first thing to water, process the garden bed, is a solution of potassium permanganate and iodine. The tool will protect the culture from fungal diseases and lower the acidity of the soil. To prepare it, mix 2 packages of potassium permanganate with 10 ml of iodine and 0.5 kg of soda. Substances are dissolved in 10 liters of water. The finished product is diluted in a ratio of 1 to 10 and the garden is watered with it.
    • From an onion fly, 200 g of salt and 1-2 tablespoons of ammonia are dissolved in a bucket of water. A one-time irrigation of the beds is carried out, trying not to fall on the leaves.
    • To protect plants from nematodes, the seedlings are soaked for 20 minutes in salt water, and then kept in water at 45 ° C for 10 minutes. To combat existing insects, marigold tincture is used. To prepare the product, half the volume of fresh or dried flowers is poured into the bucket and water is added to the brim. The mixture is insisted for two days in a dark place. The infusion is filtered, 40 g of liquid soap and 10 liters of water are added. The solution is sprayed on the soil, trying not to get on the green mass.

    Growing healthy onions in your garden is easy. The main thing is to adhere to the rules of crop rotation, watering, weeding and feeding. It is important to prevent diseases and pests and be sure to process the seedlings before storing and planting. Then the onions will not turn yellow and will yield a harvest of juicy, green feathers and large turnips.

    Watch the video: Greening Your Grounds

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