What causes soft rot in garlic? How can it be effectively prevented?

It is the fastest growing season for garlic seedlings, and it is also the high incidence period of garlic rot. Many plots have yellow leaves and dry tips, and the plants are short, how to prevent it?

Causes of decay.

Due to the high temperature this year, coupled with the mulch, the soil temperature is too high, and the garlic enters the motherhood period in advance, creating conditions for the occurrence and spread of root rot, resulting in a large number of garlic rotting in the field, the root system becomes poor, and the aboveground part can not obtain enough water and nutrients, resulting in yellowing and dry tips of the leaves. Decay occurs in the underground part.

Symptoms of harm. Garlic root rot is the most common underground disease in garlic production, caused by a variety of fungus infection, the pathogen invades from the root tip, and gradually develops to the base, the fungus begins to infect the garlic, when the humidity is large, the garlic begins to rot, and then the lateral roots, secondary roots and then rot, in the later stage of the disease, some plants rot together with the "garlic mother", and at the same time it is easy to cause maggots and other parasitic pests, the aboveground leaves fade green and yellow, and from the tip of the leaf along the longitudinal soft rot along the leaf veins, the plant is dwarfed, and the growth and development is disordered, In severe cases, the plants die and the harvest is lost.

Causes. High temperature and high humidity is the main reason for the occurrence and spread of root rot, garlic sown in mid to late September, the average daily temperature in mid to late October is 15 20, after the mulch film covering, the ground temperature can be increased by about 10. It is especially conducive to the occurrence of root rot, if garlic is planted in a plot with poor soil permeability, then the garlic nutrient body will decay rapidly, resulting in a serious occurrence of root rot.

How to prevent it.

1) Seed dressing: Before sowing garlic, 29% thiaworm pyrrol frost suspension seed dressing agent can be used to dress seeds according to the ratio of 1:200 300, which can prevent garlic mother rot.

2) Spraying prevention and control: In the early stage of the disease, 30-40 ml of 50% azole ether thiazole zinc suspension emulsion, or 30 60 grams of 50% chlorobromide isoururate soluble powder can be sprayed on water, sprayed once every 5 7 days, and 2 3 times in a row. For seriously ill and dead plants, they should be uprooted and taken out of the field in time to prevent the spread of diseases.

The main reason is root rot, garlic enters the motherhood stage in advance, which creates conditions for the occurrence and spread of root rot, resulting in a large number of garlic rotting in the field, and the root system becomes poor, resulting in yellowing and dry tips of leaves. Decay occurs in the underground part. Prevention and control methods:

1) Choose fertile soil, deep ploughing, timely sowing, and timely pest control. (2) In the early stage of the disease, 500 times of 77% killable wettable powder, or 72% agricultural streptomycin soluble powder or 4000 times of neophytomycin can be sprayed, which can be prevented every 7 10 days, and 2 3 times of continuous prevention and control.

For example, the commonly used fungicides for garlic can kill 3000, chlorothalonil, etherstrobin, and carbendazim.

Prochloraz, tebuconazole.

and so on. I will talk about the common pests and diseases of garlic and the use of garlic blight, it is recommended to use methyl manganese zinc, anker manganese zinc, frost urea manganese zinc or downy mildew and other agents in rotation to spray and control 2 3 times, once every 7 days, and pay attention to strengthening water and fertilizer management.

For purple spot disease, stem rot appears heavier plots, in the autumn planting time can choose methyl tobuzin or carbendazim or chlorothalonil according to the amount of seeds to sprinkle the seeds with an appropriate amount of water, and so on after spraying the seeds for 180 minutes, and so on after drying, sowing where fungicides are used to replace with biological fungicides, fungicides can only prevent disease in the germination period, there is no growth promotion effect on the growth of crops in the later stage, and it will also cause damage to the microbial environment of the soil, and long-term use will also cause soil compaction.

Prevention and control methods: When there are few diseased leaves in the early stage of the disease, remove the damaged leaves in time. Strengthen management, reasonable dense planting, and timely drainage after rain. Spray the following fungicides in a timely manner at the beginning of the disease: 10% Shigao 1000 times liquid, 43% Holik.

Difenoconazole can be used in the early stage of 2000 times liquid and 75% chlorothalonil 600 times solution.

Benzobromide nitrile, tebuconazole and other first-class fungicides, combined with dysen, pyraclostrobin.

and other protective agents are used together to treat diseases and prevent diseases at the same time.

It is recommended to use the Kham Gold Biological Clometrin, which can inactivate viral, bacterial and fungal pathogens, and has done a lot of tests with good results. Quicklime is applied to the ground before garlic sowing.

Sowing seeds after watering them with water can prevent the occurrence of garlic pests and diseases, and Bordeaux liquid can also be used after seedlings emerge.

Spray (100 pounds of copper sulfate for water.)

Half a catty, quicklime eight taels preparation), can inhibit the occurrence of garlic disease. Personally, I think it is best to use fungicides with a wide spectrum of fungicides, such as pyraclostrobin that we are all familiar with is a good drug, which has a good effect on fungi and bacterial diseases, and the effective period is better than that of general fungicides, and the dosage is small and economical.

Leaf spraying can be carried out with 400 times of 72% agricultural streptomycin soluble powder, or 500 800 times of 77% copper hydroxide wettable powder. Generally, spraying once every 7 10 days, spraying 2 or 3 times in a row, can have a better control effect.

Do a good job of seed treatment before planting garlic. Seed coating with seed weight suspension seed coating agent can kill garlic pathogenic bacteria; With 50% carbendazim, the seed dressing method is 100 grams of each agent mixed with 5 kg of water, 50-75 kg of seeds can be dressed, evenly mixed and dried and sown, the control effect of soft rot can reach about 95%.

If this problem occurs, some pesticides can be sprayed appropriately, such as agricultural streptomycin, and the moisture of the soil in the planting area can also be treated to achieve improvement.

How does garlic lead rot develop? How to prevent garlic soft rot?

Garlic soft rot is a kind of bacterial disease, which is easy to invade garlic, occurs at the leaf edge or leaf midrib, forms yellow-white stripes along the midrib, and when the humidity is high, the diseased part is yellow-brown soft rot, and there is yellow bacterial liquid overflow.

The plant starts from the lower leaves, and gradually expands to the upper leaves, and only 2 or 3 leaves are slightly green in the later stage, and the whole plant is yellow and dies in the heavy cases.

So how does garlic soft rot occur? How to prevent garlic soft rot? Let's find out!

First, the incidence of garlic soft rot.

The pathogen mainly survives and overwinters on the diseased residues that have not yet decayed in the soil, and infects garlic when the conditions are suitable, causing garlic soft rot.

It can be relieved by itself in times of drought and has a significant impact on yield.

The pathogen likes high temperature and humid environment, and the suitable climatic conditions for the disease are 25 30, and the high soil water content and high field humidity are conducive to the disease.

The main incidence of bacterial soft rot of garlic in Zhejiang and the middle and lower reaches of the Yangtze River is in May and June.

The susceptible growth period of garlic bacterial soft rot is in the late growth stage of garlic.

Fields with continuous cropping, low-lying terrain, poor drainage, and over-growth are severely diseased; Rainy years are badly harmed.

Second, the prevention and control method of garlic soft rot.

1. Select excellent garlic species to detoxify, disease-resistant, disease-free garlic species.

2. It is advisable to choose a flat terrain, convenient drainage and irrigation, rich soil organic matter, strong fertilizer and water retention capacity, and the front stubble is non-onion and garlic soil and jujube soil to plant garlic.

And fine land preparation, so that the top and the bottom are solid, so as to block the source of the disease and avoid the disease conditions.

Methods to prevent and control garlic soft rot.

3. Apply high-quality organic fertilizer and cake fertilizer based on phosphorus and potassium fertilizer to promote the healthy growth of seedlings and improve the disease resistance of plants, so as to reduce the occurrence of physiological diseases.

4. Sow seeds in a timely manner, generally sowing seeds before early October, watering thoroughly after sowing, and covering with plastic film after watering, so as to improve ground temperature, moisture protection and drought prevention, and promote garlic seeds to germinate, emerge and grow as soon as possible.

5. Pharmaceutical prevention and control.

Garlic treatment: Before sowing, the seed coating is coated with a seed coating agent suspended at the right time of seed weight, which can kill the rock and purify the garlic pathogenic bacteria; It can also be used with 50% carbendazim or 77% killable or 77% donin wet powder dressing, the seed dressing method is 100 grams of each agent mixed with 5 kg of water, 50-75 kg of seeds can be dressed, evenly mixed and dried before sowing.

How to prevent garlic soft rot.

Soil treatment: This method is suitable for plots that have occurred soft rot, and can be sprayed with 77% Duoning wettable powder 600 times liquid, spraying 100 kg of liquid per mu, and sowing after spraying; Or use copper sulfate, quicklime, plant ash in 1:1:

Mix in a ratio of 100 and sprinkle in the garlic groove.

Pharmaceutical prevention and control: before or at the beginning of the disease, spray 50 kg per mu with 3000-4000 times of 72% agricultural streptomycin, or 750 times of 47% Garinone, or 1000 times of 50% dyscetonium, etc., spray once every 5-7 days, and continue to prevent and control 2-3 times depending on the condition.

Garlic soft rot is a common disease in garlic, and once infected, it will affect the production of garlic. Garlic soft rot can be caused by the presence of bacteria in the seeds or if there are some pathogens left in the soil where garlic is grown. It may also be because of the climate, if the climate temperature of garlic growth is too humid and high, it is very likely to induce garlic soft rot, in addition to some external factors, such as eating excessive nitrogen fertilizer or organic fertilizer, it may cause wounds on the roots of garlic.

If you want to prevent garlic osteomalacia, you must choose varieties with better disease resistance, and disinfect and sterilize the soil in advance during the planting process, so as to reduce the survival of germs in the soil and not easy to make garlic sick. In the process of planting garlic, we should also pay attention to good fertilization, reasonable fertilization, try to apply fully decomposed organic fertilizer, and also pay attention to drainage.

Once the root of garlic is infected by bacteria, it will be taken from the root to the leaves of garlic, which can let the garlic plants rot together, and at the same time will produce some fishy odor, which is very likely to lead to the growth and development of garlic disorders, which will have a serious impact on the yield of garlic, and will make the garlic spider die directly. Garlic planting usually starts in early October every year, and if the temperature is not well controlled during this period, it may cause garlic disease.

If you want to prevent the soft rot of garlic, you should pay attention to the selection of strong seedlings as much as possible in the planting process, so as to effectively prevent the soft rot of garlic, and at the same time in the planting process should also be reasonable selection. In the planting process, it is also necessary to strengthen the management of the field, once there is a disease, remove the harmful bacteria in time, reduce the number of bacteria in the soil, so that the garlic can grow better, and ensure the yield and quality of garlic.

Finally, the soft rot foci of garlic must be treated with soil and seeds, which is the most effective way.

1. Pharmaceutical prevention and control. (1) Garlic treatment. (2) Soil treatment. (3) Foliar sprays.

2. Strengthen cultivation management. (1) Select and select garlic species before sowing, and use detoxified, disease-resistant, disease-free garlic species as much as possible. (2) The stubble before selection is a non-onium and garlic vegetable plot, and the soil species with flat terrain, convenient drainage and irrigation, rich soil organic matter, and strong fertilizer and water retention ability should be selected for planting with friends.

When preparing the land, it should be deeply cultivated and raked, so that the top is loose and the bottom is solid. (3) Formula fertilization, full decay organic fertilizer, cake fertilizer, phosphorus and potassium fertilizer are applied to promote the healthy growth of seedlings, improve the disease resistance of green garlic seedlings, and reduce the occurrence of physiological diseases. (4) Sowing seeds at the right time.

The suitable sowing period is generally in early October, watering thoroughly after sowing, covering the mulch film after watering, improving ground temperature, moisture preservation, reducing the number of irrigation, and can effectively reduce the spread of pathogenic bacteria through rainwater, watering, etc.

Causes of disease: Garlic soft rot is a bacterial disease, low temperature and high humidity are conducive to the disease, and planting in low-lying and waterlogged plots will aggravate the disease. In particular, early sowing, poor drainage or over-growing fields are severely diseased, and can be relieved by themselves in drought.

Mainly because of the humidity, there is no reasonable control of the temperature, there is a disease problem, Zheng Pi quarrel led to bacterial infection, the phenomenon of water accumulation, only to shout will lead to the soft rot of garlic phenomenon. It can reasonably control the temperature, grasp or ensure the demand of the market, and prevent it through the use of pesticides.

It may be that the seeds carry the bacteria, or the soil may carry the bacteria of the ridge, or the cold resistance of the celery is relatively poor, or it may be caused by some diseases, or it may be caused by precipitation, or it may be caused by some external factors, or it may be caused by the sowing time too early. The soil can be sterilized and disinfected when planting, and the seeds should also be disinfected, and the frequency of watering should be controlled.

If the cause of bacterial infection is caused, it is necessary to pay attention to the condition of the soil, choose the right varieties for planting, pay attention to cleaning up weeds, and pay attention to water and fertilizer management.