What are the main diseases of garlic? What fungicides are used for prevention and control? What is g

The best fungicides for the control of garlic root rot are: 41% azole ether metrofen suspension seed coating, 52% imidaclopat pyrrhoid suspension seed coating, and 5% imidacloprid granules.

% azole ether methanthalyl suspension seed coating

Because garlic root rot is a kind of disease-transmitting disease, therefore, the prevention and control of garlic root rot should be based on prevention, the simplest and most effective method to prevent and control garlic root rot at present is the pesticide seed dressing, before garlic sowing, 150 450 ml of 41% azoleether methanthalyl suspension seed coating agent per mu, mixing 150 kg of garlic seeds, and evenly wrapping the seed coating agent on the seed surface, which can effectively prevent the invasion of pathogens.

% Imidaclo-pyrroid benzo-suspension seed coating

At the same time of preventing root rot, you can also choose 52% imidac, roro, benzometer suspension seed coating agent according to the ratio of 1:200 to the model drug species for seed dressing, which can effectively prevent and control root rot, and disperse the old can also prevent and control grubs, root maggots, leeks, ground tigers, etc., with an effective period of up to 80 days, which can ensure that the growth period is not attacked by underground pests.

% imidacloprid granules

Soil treatment can be carried out, before garlic sowing, combined with land preparation and fertilization, 3 5 kg of 5% imidacloprid granules per mu, mixed with 15 20 kg of commercial organic fertilizer, can not only prevent root rot, but also have a good control effect on underground pests such as grubs, leek maggots, root maggots, and small tigers, and the effective period can reach 80 120 days.

If you want to grow garlic with large garlic, it is best to use fast-acting fertilizers and bulking fertilizers that are easy to decompose and absorb. Remember, then add a little phosphate and nitrogen fertilizer. It should not be applied too early, otherwise it will be absorbed by garlic seedlings and garlic moss, but it should not be applied too late, because after collecting garlic moss, the stem of the plant will be cut off and damaged, the leaves will begin to wilt and turn yellow, the root system will also age, and the absorption capacity and transportation function will be significantly weakened, which will affect the growth of garlic.

What are the requirements for the planting time of garlic?

The timing of the sowing of garlic is important. Each crop has an optimal growing environment. Only factors such as temperature and humidity that meet the requirements can promote the strong growth of crops.

Garlic is a culture that prefers cold climates. If the temperature is higher than 30°, the germination of garlic buds will be inhibited. Therefore, the time when garlic is grown is very important.

Too early, the temperature is too high, it will inhibit the germination and emergence of garlic, resulting in low emergence, slow emergence of garlic, too late planting, and easy to freeze. Therefore, it is best to plant garlic in white sauce or at the autumn solstice every year. <>

How do you choose seeds for garlic?

If garlic wants to be of high quality and yield, the choice of seeds is an absolutely important step. According to different origins, different production purposes and different production needs, there are different criteria for the selection of garlic varieties. But in general, when choosing a garlic variety, it is necessary to choose a garlic variety with a strong plant, no lesions on the leaves, large and regular garlic heads, lesions and wounds, uniform color of the garlic skin, no hypertrophied garlic petals and scattered petals.

To grow garlic, the land needs to be leveled.

The first thing to do before planting garlic is to level the ground. Garlic is a plant that likes moisture, but is afraid of drowning. In the process of growing garlic, water more often, but do not allow water to accumulate in the field.

If you allow water to accumulate in the field, it is easy to have the problem of rotten roots of garlic seedlings. Another taboo for growing garlic is to avoid uneven ground and water on the garlic ground.

It can be some organic fertilizer, which is very helpful for the growth and yield of garlic, and eat some phosphate fertilizer, nitrogen fertilizer and potassium fertilizer appropriately, and increase some sulfur fertilizer for the improvement of garlic yield and quality are very helpful.

You can choose well-rotted organic fertilizer, you can choose cake fertilizer, you can choose chemical fertilizer, you can choose foliar fertilizer, and you must ensure the nutrient content of the soil.

Garlic leaf blight mainly affects leaves or peduncles. Diseased leaves usually start at the tip of the leaf or other part. At first, the small white spots of the flowers enlarge, then irregular or oval gray-white or grayish-brown lesions are formed.

Black mold grows on them. In severe cases, the diseased leaves die. When infected, the peduncle tends to break off from the lesion and eventually scatters many small black particles at the lesion site.

When the damage is serious, the diseased leaves die, the garlic seedlings can not be picked, and the garlic seedlings turn green after being infected and cannot be stored. <>

Garlic leaf blight mainly overwinters in mycelium or ascomycetes and soil left behind by diseased remains. In the following year, it is discharged in the cyst and causes the initial infection, and the diseased part produces conidia and re-infects. This strain is weakly parasitic and is often accompanied by downy mildew or purpura.

In the garlic planting area of spring sowing and autumn sowing, or continuous cropping of garlic field, or mixed cropping area of garlic, green onion and leek, it is very easy to cause leaf blight. In the years when the temperature is high, the rainfall is large, and the nitrogen fertilizer is applied too much, the low-lying plots with poor drainage are seriously diseased. <>

There are many reasons why garlic leaves turn yellow. For example, it is normal for garlic to show a small amount of yellowing in the leaves during the process of decaying and ripening. But if at other times the leaves turn yellow, it is worth our attention.

First, improper fertilization. When garlic lacks a certain element during growth, the leaves turn yellow. For example, nitrogen deficiency can cause emaciation, yellowing of old leaves, and yellowing of leaf tips due to potassium deficiency.

The second is too much fertilization, and the concentration of fertilizer is too large, resulting in seedling burning. The spray concentration is too high or the pesticide is sprayed incorrectly. <>

Disease-resistant varieties should be selected, and cultivation techniques such as crop rotation, timely planting, reasonable dense planting, optimization of water and fertilizer management, and cultivation of robust ranks should be adopted to prevent the occurrence of diseases. Pay attention to the control of garlic aphids and reduce biological media. Remove broken leaves and peduncles in a timely manner.

Strengthen field management, reasonable dense planting, timely drainage after rain, and improve the disease resistance of hosts. <>

You can choose a special drug. At this time, you can choose insecticides, and then you can also choose herbicides, and then you must pay attention to the composition and degree of these pesticides, and you also need to pay attention to the appropriate fertilization time, and you must pay attention to the chemical composition.

Prochloraz manganese salt, carbendazim, green lactone, chlorothalonil, and zecze, which can be used, are more useful.

The pesticides used to control garlic leaf blight include carbendazim suspension, primethine wettable powder, Baitai dispersible granules, azoxybacterium lipid suspension, Bordeaux liquid, difenoconazole dispersible granules.

Benmycium, ethylphosphine aluminum, Suklin, copper ammonia, Bordeaux liquid, these can be the most commonly used by farmers.

For example, there are chlorothalonil, carbendazim, zebze, green lactone, gramcomb and so on. Be sure to do a good job of sterilization and disinfection, and at the same time you should choose the right fertilizer, you can also choose some cow dung, and you can also use Asimida**.

The main diseases are garlic leaf blight, bacterial soft rot, garlic sclerotinia disease, phytophthora root rot, blight, etc.

In the early stage of the disease, difenoconazole, benzobromidonitrile, tebuconazole and other first-class fungicides can be used, and at the same time, they can be used together with protective agents such as dysenlian and pyraclostrobin to treat and prevent diseases at the same time.

The onset site of garlic sclerotinia is at the base of the garlic pseudostem under the membrane, and the initial lesion is water-stained, and then it darkens to gray-white, and the ulcer is rotten, and the rotten part emits a strong garlic odor. After the garlic leaf sheath rotted, the upper leaves showed wilting, and gradually yellowed and died, and the garlic roots and root plates rotted and scattered. After the onset of the disease, it can be sprayed with mold, iprodiamide, azoxymyceclamine, pyridoxamine and other agents.

Garlic leaf blight is a common garlic disease, which affects different levels and mainly harms garlic in the open field. In particular, if there is a lot of precipitation, it is more likely to occur, and in severe cases, it will lead to wilting and limited production.

Pattern of onset

Garlic leaf blight is caused by infiltration of the bacterial Ascomycetes subphylum Sculococorum. The key to the pathogen is to spend the winter with the mycelium or ascomycetes on the way to the loss of the diseased residue, and the next year will cause the ascospores to cause infiltration, and then it will be re-infected with the cyclone and light rain, landing on the garlic leaves, and after the garlic is planted in autumn, the spores on the diseased residue will be scattered on other garlic leaves with the cyclone, and small raindrops will be scattered on other garlic leaves, causing other garlic infections. These bacteria need to survive in high temperatures, so temperatures with a lot of precipitation are more likely to occur.

Generally, in low-lying terrain, the drainage is not smooth, mixed with onions, ginger and garlic vegetables, and the field with the main stem of the injury is more likely to occur.

Onset of the condition

Garlic leaf blight is the key to damage garlic leaves and garlic seedlings, and the leaf disease will gradually develop from the top of the old leaves below. After the onset of the disease, there will be water-like lesions, there are also milky white dents annular spots, with the severity of the disease, the lesions will become earthy yellow, in the middle and late stages of serious cases, it will promote all the leaves to develop lesions, and even wither In the case of relatively large environmental humidity, the lesions will become purple and black, and the surface layer will appear dark brown-like substance; Garlic infected with leaf blight regrets can not harm the production of garlic seedlings, garlic can not be effectively improved, and the yield is very serious.

Ways to prevent it

Select farmland with high terrain for planting, the water level of farmland with high terrain is low, and drainage is more convenient; Farmland with low terrain should do a good job of sewage ditches.

Do not regenerate, remove the diseased and disabled bodies on time, damage or bury them, and reduce the infection of germs; For the garlic in the seriously diseased field, it can be planted in rotation with winter wheat and rapeseed, and the garlic disease residue in the field can be immediately eliminated and the source of pathogens can be reduced.

Improve cultivation technology, effective fertilizer, reasonable dense planting, immediate drainage and ventilation, reduce temperature, improve the disease resistance of the main stem, and apply pesticides to dress seeds before planting.

Effective fertilization, more organic fertilizer nitrogen, phosphorus, potassium fertilizer combined application, planting soles fertilizer, to promote the growth of the main stem.

It is recommended to apply garlic seed dressing in all aspects, which has an effective control effect on garlic leaf blight, and can also promote the growth of garlic roots, so that garlic hair is early, hair is more, rhizomes are developed, leaves are firm, underground stems are thick, and the effective time is up to 7 months, which can significantly improve the yield and quality of garlic. It can not only prevent garlic leaf blight, but also prevent sclerotinia disease, root rot, white rot and other diseases, in addition to preventing moth, such as: garlic maggots, leeks, whiteflies, spotted flies and other insect pests, but also can promote garlic sprouts, grow roots and strong trees, improve heading ability, and lay the foundation for high yield and increased yield of garlic.

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