Onion is considered a necessary ingredient of many dishes. He is unpretentious in cultivation, but if something does not suit to the conditions of cultivation, he begin to turn yellow feathers. To help turn green onion pens again, it is necessary to know the cause of their decay.
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Why the onion starts to turn yellow sooner?
Yellowing of the leaves at the end of July - should not cause alarm in August. This is a sign that the harvest is ripe. The best time for harvesting - the period when the tops polyazhet and break the stem dries.
If the onion turns yellow in June, therefore, have any problems. Most often they can be to a lack of moisture. Onions need for moisture in the first two months after planting. When drought it watered 2 times a week, in the rain can be watered less. A month before the beginning of the harvest irrigation should be stopped so that the bulbs do not grow again.
The second cause desiccation onion tops are pests. With the defeat of the onion fly, onion begins to fade early in the bulb may attend its larvae, there are signs of rot.
The pest is not difficult to recognize. The adult has a yellowish-gray body up to 7 mm, and the larva resembles a truncated white worm with sharp tips.
There are popular ways to deal with the onion fly. Despite the fact that it affects the culture of onion and other pungent smells she can not stand. Therefore, onions are planted next to carrots, tomatoes and other strong-smelling cultures. With the same purpose can be planted next marigolds, calendula, herbs.
Removal of weeds from the beds would deprive asylum onion fly. To expel the larvae stage at the plantation can sprinkle wood ash mixed with tobacco dust.
Onion skrytnohobotnik striking onion feathers inside. They appear white spots and moves the larvae in the form of longitudinal strips of light. Plumes curl and dry up.
In the adult beetle reaches a size of 2 mm. Legs and elytra brown, lighter body. In the center of the cephalothorax runs transverse light strip. The larva is light with a dark head.
The larvae feed on the pulp sheet and pupate in the soil. The main measures of prevention is timely cleaning and deep digging plantation spring processing Bordeaux mixture of the soil. You should not plant onions in the same place. In case of defeat in a timely manner to cut off the damaged feathers. The drying of the onion feathers may cause shortage of nitrogen. The reason may be the lack of this element in the soil, or he is in a position to reach the plants. He assimilated by plants in a dissolved form. Drought prevents this. But even with heavy rainfall it can leach out into the deeper soil horizons. Therefore periodically onions should be fed nitrate, infusion of mullein, or "green dressing."
How to deal with the yellowing onion feathers
For those who are not supporters of the use of chemicals at the site, to solve the problems of resuscitation onion has several folk methods:
- Before planting onion sets soak in the solution of potassium permanganate, and sodium chloride furrow waking.
- Prepare a solution of 10 liters of water, 100 g of sodium chloride, 5 ml of ammonia, 2-3 cups of wood ash and feed them to bow 1 once every 10 days, until he recovers.
- Prepare a stock solution of 5 liters of water, 10 ml of iodine, 1 hr. l. potassium permanganate and 0.5 kg of baking soda. The working solution is induced in a ratio of 1:10. The processing circuit 1 every 7-10 days.
- Process soil around the bulbs dry mixture of ash, tobacco dust and naphthalene.
Such simple measures save onion planting from premature fading.
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