Most people who have a garden definitely set aside part of the site for planting green onions, but even with proper care, the tips of the leaves often begin to turn yellow in plants. What’s the matter here? Why does this problem persist with the most careful care? The main reasons why the leaves turn yellow:
- Insect damage;
- plant diseases;
- The composition of the soil is not suitable for growing crops;
- Improper care;
- Climate and weather.
Among the known species of insects that parasitize on onions, the following stand out: stem nematode, moth, tobacco (onion) thrips, and some others. They are capable of spoiling the entire long-awaited crop crop in a season. Adults lay their larvae on the onion, which feed on parts of the plant or its juice. As a result, the leaves begin to turn yellow. If you do not engage in the fight against parasites, then the harvest can not wait. To prevent harm, do the following:
- Plant onions as early as possible so that the plant gets stronger at the time of the appearance of insects;
- Plant carrots between rows of onions. Its smell is not liked by insects;
- Treat landing with special poisons;
- Do not plant a crop in the same place twice in a row;
- Spray the bed with saline;
- Spray the leaves of the plant with a solution of ammonia or metronidazole.
The most common disease that develops in onions. Outwardly, it manifests itself in the appearance of yellow dots on the green part of the plants. As a result of exposure to the disease, the leaves begin to dry out. There are several ways to deal with rust:
- Warming up the seeds before sowing in the ground;
- Thorough drying of seed;
- Treatment of green leaves with copper chloride, ammonia solution or metronidazole;
- Crop rotation.
The disease affects the bulbs of the plant. When cut, it is clear that between healthy scales there are dark sick ones. The carriers of the disease are insects. An infected crop cannot be stored for a long time, because it quickly deteriorates. Planting diseased bulbs will lead to the appearance of yellowness on the leaves and general inhibition of growth. To prevent the disease, you need to carefully monitor the choice of material for planting, as well as for preventive purposes, treat the soil with drugs that can destroy the disease, for example, metronidazole.
A fairly common disease in plants. It is caused by a special fungus that parasitizes onion plantings. The source of the disease is in the soil and from there it begins to infect planted plants. The result of the spread of the fungus is observed in the form of the appearance of yellow tips on the leaves, the drying and death of the green part of the plants. There are several ways to fight effectively:
- Proper selection of a suitable place for planting. Areas that can be flooded with water during rain are not suitable for beds;
- Correct crop rotation;
- Selection of healthy seed;
- Preliminary disinfection of seeds;
- Landing should be carried out according to the gardener’s calendar;
- To store the crop, choose a suitable place where the temperature and humidity will be comfortable for the fruit.
Summary table on onion diseases
Lack of nitrogen in the soil
Yellowness can appear on the tips of the leaves not only as a result of the disease. Nitrogen content in the soil is of great importance for healthy growth. If it is not enough, the leaves will lose the chlorophyll necessary for the development of plants. What should be done in such a case? The best solution would be to use nitrogen fertilizers. You can use substances of mineral and organic origin. If the owner of the site prefers natural substances, then well-rotted manure is best. It is strictly not recommended to use fresh organic fertilizer, because it may contain fungi and microorganisms that are dangerous for plants.
Improper plant care
Yellowing of the leaves can occur with a lack of moisture in the soil. Watering should be intensive. For normal growth, regularity once every three days is enough. Water should not contain a lot of salts and it should be fed directly to the roots. Morning is considered the best time for watering. The water temperature should be between 18-25 degrees.
Fertilizers that are planned to be introduced into the soil can be previously dissolved in water and used for irrigation. There is a double benefit. The first time you can feed the onion when the feather rises 3 cm above the surface, then after a week the procedure can be repeated.
Sometimes all the efforts of the gardener can be in vain, because the main factor is the weather. Plant growth can be affected by rainy or too hot summers. As protection, it is better to use a stationary greenhouse. In this case, the harvest will depend only on the actions of the gardener.
Any garden owner can get a good onion crop if he follows the recommendations and follows the rules for caring for plants.