The feathers of onions and garlic can become deformed or discolored as they grow. Under some conditions, this is a variant of the norm, it is enough to improve the environmental parameters, and the state of the plants will be restored. However, in case of infection (bacteria, fungi, insects or mites), special means must be used.
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Negative Factors Affecting Onions
Before using the drugs, you need to find out why the leaves of onions and garlic turn yellow. In these cases, the negative factors can be different.
Reasons for yellowing onions:
- Dry soil. Onions are a moisture-loving plant, and with insufficient watering, the feathers turn yellow. If the upper leaves change color first, you need to look for another reason. In the summer, it is recommended to moisten the soil 2 times a week. If the air temperature rises and the humidity decreases, you can increase the watering frequency. It is important to use warm water for this purpose: the recommended liquid temperature is at least + 18 ° C.
- Unsuitable soil composition. If the rules for feeding are violated, the appearance of the onion deteriorates, and its growth rate decreases. If nitrogen-containing fertilizers are not added to the soil during the development period, yellowness will appear. It is recommended to add 1 tbsp. l. urea and 0.5 kg of fresh droppings in water (10 l). After 2 days, this mixture can be used. Top dressing is performed after watering the plants.
- Infectious diseases. Onions are often affected by fungi. Common infections: bottom rot, rust, etc. The infected leaves are immediately destroyed (burned), otherwise the disease will spread to other plants. For treatment, fungicides are used - antifungal agents.
- Damage by pests - insects or ticks. Plants die quickly, as adults and larvae suck the juice from the green feathers. As a result, the leaves turn yellow, and onion growth is inhibited. It is recommended to inspect the plants regularly. It is possible to rid them of pests at the initial stage of infection, in the future the number of the colony increases, which leads to the death of the onion. Insectoacaricidal preparations are used. For prophylaxis, ash, tobacco dust and ground pepper are used.
Causes of yellowing of garlic
Yellowing is not always caused by the impact of negative factors, sometimes it is a consequence of mistakes made in the process of caring for garlic. Possible reasons for the appearance of yellowness on feathers:
- Improper fit in winter. The recommended depth is 3-5 cm. When the garlic is planted in the fall, it should take root. Shoots should not be allowed to appear: during a cold snap, this will lead to a change in the color of the feathers, and as a result, the plant will be weakened in spring.
- Excess moisture. Garlic does not tolerate dry conditions, but it does not develop in wetlands either. The denser the soil, the less often you need to water. In addition, clay soil needs to be loosened more often.
- Top dressing. The lack of nutrients provokes a deterioration in the condition of plants. First of all, yellowing of the leaves is noted. It is recommended to use complex fertilizers that contain different components, for example Fertiki Lux. 30 g of this product is added to water (10 l). The amount received is enough for watering 1 m². Another way: they make a groove in the aisle, apply urea or other fertilizer (the recommended amount is 40 g / 1 running meter. m).
- Infections. Common diseases affecting garlic include white rot and fusarium. Given that it is difficult to rid feathers of signs of infection, it is recommended to resort to preventive measures. For example, garlic is soaked in fungicide-based solutions before planting.
- Pests. Garlic is attacked by thrips, mites, onion flies, nematodes and other insects. To combat them, insectoacaricides are used. For prevention purposes, folk remedies are used.
To reduce the risk of pest infestation of garlic, it is necessary to alternate it with carrots at the planting stage. Such a measure will provide a deterrent effect.
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