When the onion turns yellow in the garden at the end of the season, this is considered quite normal, since the growing season ends. However, in some cases, yellowness manifests itself in summer or spring. There are many reasons for this, and it is important to find them in order to fix the problem.
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First of all, yellowing of the leaves can indicate the development of diseases such as:
- Rust. This disease is fungal and manifests itself as rounded yellow spots on the leaves. In the central part of the sunspot, a raised form of orange-brown spores appears. The disease can appear due to too close sowing, imbalance of nutrients in the soil and high humidity. As such, methods of treating rust have not yet been invented, only periodic preventive measures will help. To do this, before sowing, it is necessary to treat the soil and bulbs with a weak solution of potassium permanganate, and at the beginning of the summer period, pour the sprouts with a soapy liquid of copper oxychloride.
- Rot of the bottom, fusarium. In this case, the leaves begin to turn yellow at the tips, and then gradually curl, which leads to the death of the plant. The disease is provoked by saprophytic fungi, which are in the soil for a long time and wait for the right moment. To prevent the disease or eliminate it, it is necessary to strictly observe the rules of crop rotation, to cultivate those varieties which are resistant to fusarium and carefully process the planting material before sowing with a weak solution of permanganate potassium.
In case of diseases, it is necessary to immediately dig up the affected plants and destroy them in order to prevent the spread of infection. Especially this rule should be followed when growing onions in a greenhouse, where favorable conditions for instant infection are created.
In addition, pests can cause yellowing of the leaves. It is easy to find them on a plant; you just need to tear off a yellowed leaf or stem and carefully examine them. The appearance of parasites can be noticed immediately. These are the smallest insects or worms.
If the plant is struck by an onion fly, then the leaves begin to turn yellow at the tips, and small caterpillars are found inside the feathers. Gradually, they can move to the bulb itself, and as a result, the culture dies.
For prevention, it is recommended to use traditional methods of treatment - tobacco dust and ash are insisted, and then red pepper and liquid soap are added to the mixture. However, in case of severe pest infestation, home remedies do not always help, therefore, chemical insecticidal preparations, such as "Fufanon", "Mukhoed", have to be used. These funds can destroy both diseased and healthy leaves, and they are also dangerous to human health. Onions should be treated with chemicals with great care.
If the plant is struck by an onion moth, then the pest can be identified by egg clutches, and its activity occurs at the end of the spring period. Caterpillars hatched from the masonry make their way into the feathers of the onion, which contributes to yellowing. To prevent onion moth infestation, it is recommended to treat the garden bed with a strong salt solution before planting. If the infection has already happened, then drugs will help to get rid of the pests: "Iskra", "Dachnik", "Metaphos", "Avant".
In addition, onions can turn yellow from improper care. In the case when gardeners do not water the beds properly, as a result of which the soil becomes either dry or too wet. To prevent this from happening, it is necessary to observe the correct watering regime. Another reason for the yellowing of the leaves is also the lack of nutrients. In each case, it is necessary to approach the elimination of yellowness on an individual basis.
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