Onion disease and treatment

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Invisible danger

True, in this case, it is necessary to spray the plants at least 3 weeks before harvesting.

Peronosporosis

In addition, it is advisable to sow carrots next to the onions, since the phytoncides that are secreted by carrots can scare away the onion fly. In turn, onion phytoncides prevent the appearance of a carrot fly.

In the photo, the onion fly so strikes the onion.

Black mold.

Description

The onion mite penetrates the bulb and settles between the scales. As a result, the bulb rots and disappears. Against the tick, warming in hot water is also used: 5 minutes at a temperature of 50 gr.

The earth in the garden with onions must be constantly loosened. In loose soil, it is more difficult for the larvae to move, frequent loosening disorients them.

onion pests

Course of the disease

From powdery mildew: Quadris, Ordan, Alirin-B, Revus, Bravo, Abiga-Peak and others (according to instructions).

Subsequently, the disease spreads to the entire leaf blade, the leaves wither and rot. The infected parts of the bulb turn brown.

Signs of powdery mildew

The spread of this onion disease in the garden is happening rapidly. After planting infected bulbs, the appearance of the conidial stage (spread of spores) under favorable conditions can occur after a short period of time. At a humidity of 90-95% and a temperature of 15-18°C, after 4-9 days, the infection reaches 40-50%, and after two weeks, all plants on the plantation are infected. This period is reduced or increased depending on temperature and humidity. The formation of conidial sporulation occurs only at low temperature and high humidity. During the growing season, the fungus can give 4-7 generations.

1. Numerous onion diseases and pests can significantly reduce the yield of this extremely useful healing vegetable. Powdery mildew, various types of rot, insect pests, bacterial infections affect the leaves, fruit, and roots of the plant. Often, "point" control measures are ineffective - a set of measures is required, including not only the processing of plantings with special equipment, but also strict adherence to agricultural technologies.​
2. Can be sprayed with serum
3. If possible, plant marigolds side by side

Fusarium rot

An onion fly is considered an equally dangerous pest of garlic and onions. The larvae of this insect penetrate the bulb itself through the bottom or at the very base of the leaves, which usually leads to the death of the bulbs.

1. Black mold is an unpleasant and also fungal disease. Black mold develops during warm storage. If there is reason to believe that the onion is infected with it, then you need to organize cold storage of onions: from 0 gr. up to - 3. .​
2. Frequently occurring
3. Rake the earth from the neck of the bulb. This is a very effective technique. The larva moves with difficulty in loose earth and does not reach the neck of the bulb, since the earth is moved away from it.

Cervical, or gray rot

were mentioned in passing. Probably the most common and causing the most harm is -

From gray and cervical rot: "Kvadris", "Bravo", "Ridomil Gold", "Switch" and others.

Bacterial rot of onion testicles

Sometimes, due to a lateral lesion, the healthy half grows, and the infected one twists and presses in - the disease gives the bulb a concave-convex shape.

The development of onion disease occurs mainly at night and in the morning, when raindrops remain on the plants, or dew falls, the air temperature drops. In the field, two wet nights are needed to complete the infection cycle. This is facilitated by the condensation of water on the leaves, the temperature of which is lower than air. The defeat does not always occur, but only on critical days, when the moisture on the leaves remains until noon. Conditions are very favorable for the epiphytoty of peronosporosis, when cool nights alternate with relatively warm days - the fungus is spread by wind and heavy rains.

Onion diseases and their treatment

Consider the main diseases of onions and their treatment. Onions are damaged by about 50 species of fungi, insects and microorganisms. Most often, plants get sick on clay, floodplain, waterlogged soils. Saturation of the soil with rotted manure and mineral fertilizers, which contain a lot of nitrogen, also leads to production losses due to the accumulation of diseases.​

Everyone in the house has dairy products, do not pour out sour milk, fermented milk whey from kefir. Lactic acid bacteria have a negative effect on the powdery mildew pathogen and at the same time do not harm plants. Recipe for onion diseases - powdery mildew: spraying agent is made from fermented milk whey separated from dairy products. We take cold water and dilute its serum in a ratio of 1:8 -1 to 10. Stir until a homogeneous state is obtained. Pour the prepared solution into spray containers. Now in the morning or in the evening you can process the plants.

• An attentive gardener and gardener can avoid the next misfortune in the struggle for the harvest.
• Usually, the onion fly raid begins in the spring, and it coincides in time with the cherry blossoms. 20 days after the eggs are laid, the larvae hatch from them, which go deep into the ground and pupate there. Young flies fly out to replace them, and everything repeats all over again.

Onion storage in braids.

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How to avoid onion disease

onion diseases

Place a bed of carrots next to the onion bed. The onion fly does not tolerate the smell of carrots.

onion fly

However, constant treatment of vegetative plants with systemic fungicides can lead to the emergence of resistant strains of pathogens and reduce the effectiveness of drugs.

OgorodSadovod.com

Pests and diseases of onions Onion fly

Pests and diseases of onions, onion fly

Pests and diseases of onions. Onion fly.

Onion pests.

Onion fly.

One of the most dangerous onion diseases during storage, and sometimes during growth and harvesting. The disease begins shortly after collection - with softening of the scale tissue, as a rule, at the neck of the bulb, especially in places of mechanical damage. The affected areas look like depressed "boiled" spots and gradually cover the surface of one or more scales. They are brown, watery, over time, such areas die off and become porous, like a sponge. A gray mass appears on the infected tissue (between the scales), and a black mass of small sclerotia may form on the outer (around the neck). The area of ​​​​infected tissue increases, growing down the scales. The disease is accompanied by stages, which can be distinguished by characteristic symptoms: The disease of onion peronosporosis (aka downy mildew) has been known for a long time. The causative agent - the fungus Peronospora destructor Casp - was first discovered and described in England in 1841. Decades later, he struck Europe and the vast British colonies: from America to Australia. To prevent cervical onion rot, you must try to remove the vegetable immediately after it ripens, without delaying this matter. After the neck begins to dry out and the feathers fade, you have a signal - you need to start harvesting. After the onions and garlic are dug out, they are dried in the wind and sun for 3-4 days, usually leaving them right on the ridges. Of course, it is better to choose a sunny day in August for harvesting. Gently remove the earth from the garlic, shaking it off with your hands, you must try not to damage the scales (the quality of storage and disease resistance depend on them). It is necessary to dry these medicinal vegetable crops in the sun, you can move them closer to the house and spread the onions and garlic on an oilcloth. The remaining leaves should be cut off. Cut the onion so that the tail of the vegetable remains approximately 3 cm. This disease of vegetables is especially relevant in the rainy period. Blurry spots begin to appear on the leaves of plants, which begin to gradually increase in size, forming a gray coating, which is fungal spores. These spores are able to scatter with gusts of wind in different directions, infecting other plants. Methods for processing, protecting onions and garlic from downy mildew.

Pest Control Recipe:

It is best to store onions in braids as in the picture and at a temperature of + 15 - 20 gr. in a dry room. If it is not possible to store in a warm room, then cold storage should be organized. For good preservation, the temperature should be around 0 gr.

have a very strong influence on successful storage. Already after a month of storage, onions can be damaged by diseases and quickly rot.

• Onion affected by a nematode.
• . She lays her eggs in the ground, and the eggs hatch into larvae. The larvae are small off-white worms that move towards the bulb and bite into its neck.
• Every spring we diligently plant everything in the beds, but our vegetables often suffer from diseases and pests. Today we will talk about an irreplaceable and healthy vegetable - onions. Or rather, about what diseases of onions can lie in wait for him and how to deal with them.
• The bulb is affected only through damaged areas, almost always at the neck, so this disease is also called cervical rot. Most often, the rot penetrates the fabric during harvesting, when the leaves of immature and poorly dried bulbs are cut too low. Instances that are infected with downy mildew are more affected by gray rot.

The first sign of green onion disease is the appearance of a brownish-lilac velvety coating on healthy leaves.

For a long time, a harmful microorganism in the east of Europe met sporadically, until an “epidemic” of the disease occurred in 1965-66. Then peronosporosis covered half of all onion plantations in Ukraine and Kuban. A new wave of distribution swept in the 70s. Now downy mildew is observed annually in all growing areas, especially in the southern regions.​

Store harvested onions and garlic< надо в картонных коробках или корзинах в прохладном, но сухом помещении. Также сплетают их в " косы" и подвешивают в кладовых, при этом уберегая от холода и влаги.​

In order to prevent diseases, it is necessary to warm up the seed stock before sowing at high temperatures. So onion sets are heated in the spring at 45 degrees Celsius for half a day. ​

how to grow a good crop of onions

Well, well, now you know how to plant, care for and store turnip onions. I wish you all good luck!

• Onion diseases.

Downy mildew. Stem nematode is another onion pest. The nematode and its larvae live in the ground. It is difficult to fight the nematode, as it is a very small insect. In order not to infect the earth with this pest, onions are heated in hot water at a temperature of 45 - 48 gr before planting. Soaking in salt water for 2 days (3 tablespoons per 10 liters of water) also helps. Onion fly larvae.

Let's start with diagnostics. If the onion feather turns yellow, or acquires a grayish tint, then most likely we are dealing with an onion secretive proboscis. In this case, the onion is treated like this: a concentrate is made from one percent copper sulphate, one percent lime, and 98 percent water. Pour this mixture over the onions. You can also use ordinary table salt, dissolving it in water with the calculation of 1 part of salt to 10 parts of water. You can also add manganese there until you get a not bright pink color.

The causative agent of onion disease is most often the bacterium Erwinia carotovora Bergey, which can cause vascular and parenchymal lesions. The source of infection is contaminated soil and affected post-harvest onion residues. Bacteria are spread by splashing raindrops, irrigation water and insect pests. Sometimes other bacteria also cause bulb rot: Pseudomonas aeruginosa, Pseudomonas gladioli and others.

Over time, the spots increase in size and become first pale yellow, and later brown.

All types of vegetables are susceptible to this onion disease: onion, family, batun are affected regularly. Chives, Altai and Beijing - only in the years of epiphytoties (epidemics). Powdery mildew has become not only common, but also the most harmful disease. It leads to a decrease in the size of the affected heads and delays their maturation. Attempts to breed varieties that are not susceptible to downy mildew have not been successful. Among the fairly stable experts note "Skvirsky".

Learn more about the growing popularity, very useful daikon vegetable. Read our other useful flock about ways to control plant pests:

In the villages, I warm up the onion on the stove (meaning the upper chambers of the village stove).

• Onion storage.

To grow a healthy vegetable, you need to correctly take into account the timing of the appearance of onion flies.

To grow healthy onions and garlic, you need to know what diseases, onion and garlic pests can threaten vegetables that are so necessary for health and tasty. In this article, we have collected information on how to deal with the main pests and how to save the crop.​

Peronosporosis or downy mildew. It is usually introduced with infected onion sets. Gray spots on the leaves - this is how the disease begins, the infection gets to the bulb from the leaves. When stored on a bulb under dry scales, a gray coating also appears, and then rot.

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Diseases and pests of onions and garlic - Garden and vegetable garden