6 most dangerous diseases of onions

Bacteriosis

It is dangerous because it is practically not recognized at an early stage. A healthy-looking bulb is actually rotting from the inside out. Recognized by smell. It is caused by bacteria living in the ground, Pectobacterium carotovorum and Bukholderia cepacia.

These bacteria get into the bulb, due to mechanical damage, due to sucking insects. To fight this disease should be prophylactically, by the method of destroying vectors, insects.

Onion bacteriosis, example

Alternaria onion

The disease arising from the fungus Alternaria. The fungus is carried by wind, rain and insects and can destroy half of the crop. It is recognized by the appearance of small watery spots on the feathers, with a white center. The bulb becomes watery.

At the first symptoms of the disease, the onion is treated with a solution of copper sulfate (20 g of the drug and 200 g of soap shavings are dissolved in a bucket of water). Spraying should be done every two weeks until symptoms disappear.

Alternaria onion

White onion rot

Caused by the fungus Sclerotinia sclerotiorum, which can affect any part of the plant. It is recognized by the yellowness and death of the leaves, by the appearance on the bulb of black blotches with a white fluffy bloom.

Diseased plants should be removed from the site. At an early stage, you can resort to treatment with fungicides, Abiga-Peak, Ordan, Previkur Energy are well suited for this.

White onion rot

Downy mildew onion

A disease caused by various types of fungi of the Peronospora family. It is spread by wind, moisture, animals and people. Most often it occurs due to the ingress of infected planting material, and it appears only after a month.

Light spots appear on the feathers, then the feathers wither and die off, after the disease leads to the death of the entire plant.

For prevention, the planting material is treated with Oxyhom. It is also possible to grow onion varieties resistant to this disease Vetraz, Centurion, Stuttgarter, Riesen.

Downy mildew onion

Onion mosaic

This disease is carried by aphids, garlic mites and nematodes. It is revealed immediately, upon the appearance of yellow spots and stripes on the feathers, located in a chaotic order. And the bulbs themselves stretch and shrink. In the soil, the virus dies by itself. And in the bulbs it is killed by heating for 10-12 hours at 40 degrees.

Onion mosaic

Onion bottom rot

Caused by the fungus Fusarium. Outwardly, it is determined by the appearance of a white mycelium at the bottom of the bulb. At the same time, the tips of the feathers turn yellow and dry, and a pink bloom appears between the scales of the bulb. It occurs mainly due to mechanical damage to the bottom of the bulb.

In this case, the infected crop should be burned. And you can prevent the appearance of this disease by soaking the onion in a solution of the fungicide Fitosporin-M before planting.

Onion bottom rot, fusarium

Parting words

Also, onions have a great many less dangerous, but still quite unpleasant diseases. But almost all of them can be prevented with timely preventive measures.

For example, a storage room should be pre-treated with a bleach solution. And also, such measures as warming up or dressing the seed material will significantly reduce the possibility of disease.

Well, do not forget about the correct crop rotation, watering and spraying against pests