What are the symptoms of garlic purpuropathy? How can it be scientifically prevented?

Garlic contains garlic, which has a strong bactericidal and health care effect, and is a vegetable that everyone loves to eat. However, during the growth of garlic, various pests are increasing due to years of heavy cultivation, especially the disease of garlic, which can cause the yield of whole straw, and this disease loses water, which seriously affects the production and quality of garlic. The following mainly introduces the pathogenesis and prevention methods of purple spot disease.

Symptoms of the disease. Infectious diseases usually damage the leaves and peduncles. The first ink is a stainless steel white dot, then shifts to a light brown or slightly concave point in the shape of a spindle and continues to expand brown or dark purple.

Surrounded by a yellow halo, the disease is long brown or black-gray, atrial rib plaques, the disease continues to expand, and the whole lobe is yellow or broken.

Pattern of onset. The pathogenesis can be infected by wounds or natural orifices. The pathogenesis of the pathogenesis is high, germination and invasion must drip in the water, and the spores can multiply in the field through air currents and rainwater.

It is often mixed with cream or leaf wilting during the attack, the temperature is suitable for 25-27 , and there is no pathogenesis under 12, therefore, warm and humid spring and summer are seriously ill. Sandy soils, dry land, early deposits or old seedlings, show fields suffering from diseases.

A comprehensive approach to prevention.

1. Rotate reasonably. Choose crops with wheat, corn, potatoes and crosses to rotate, over 2 years.

2.Break the disease-resistant garlic, choose multi-glass spray before sowing to reduce the occurrence of diseases, and cultivate and grow seedlings; Reasonable putting, promote ventilation and moisturization, reduce the probability of disease and slow down the spread.

3.Remove victim blades, flowers, and strains after harvest and focus on burn treatment.

4.Scientific fertilizer management. rational irrigation, strictly forbidden water, water supply, timely drainage, prevention of the occurrence and spread of diseases; The decomposition of organic fertilizer and phosphate fertilizer is increased, and during the growth period of garlic, according to the local fertilizer and plant growth, it is improved and the resistance of the plant is increased.

5.Drug prevention: In the initial stage of the disease, carbendazim, chlorothalonil, methalin, manganese-zinc, prochloraz and other drugs are used for prevention and treatment. Once every other week for 2-3 days, pay attention to the rotation of medications.

Garlic purple spot, also known as black rot, mainly harms leaves and garlic sprouts in the field, and harms garlic bulbs during storage and transportation.

Prevention and control methods: apply sufficient basal fertilizer. Strengthen field management and enhance plant disease resistance. (2) Implement job rotation for more than 2 years.

Mainly in the leaves of the color change, and most of the discoloration, this time should go to see a series of pesticides, so that it can also be well controlled, you can also choose healthy high-quality garlic seeds for planting.

Garlic purple spot is also known as black spot diseaseIt refers to a pathology in which the fungus harms the garlic leaves, and the leaves appear white and slightly sunken spots at first, and the lesions ** are light purple, and then expand and the color turns dark purple。Now that we understand garlic purple spot disease, it is necessary to prevent and control it: the first is to select seeds, choose excellent garlic seeds, followed by garlicCrop rotation is recommended every three yearsand, finally, forGarlic seeds with purple spot disease should be stored separatelyand do not infect other good garlic seeds.

Garlic leaf blight: The pathogenic fungi of leaf blight are Phyllum blighter and S. swelling, which mainly overwinter in the soil with ascomycetes or mycelium attached to the diseased residues, and spread by wind and rain in the second year. To prevent waterlogging in the field, the gray mold and rust of garlic are related to the high humidity of the garlic field, especially when planted in the low-lying terrain and prone to staining in the garlic field, the disease is more serious, and in the middle and late stages of garlic growth, in the middle and late stages of garlic growth, in the case of continuous rainy days, the gray mold and rust of garlic are more likely to cause outbreaks.

Pathogenesis of this disease is caused by Staphylosis allium, which is a fungus of the genus Botryspora in the subphylum Semi-Knowitives. The pathogen mainly uses sclerotia to lurk in the soil of garlic fields for summer and winter.

The pathogen overwinters with hyphae or ascomycetes left in the soil or garlic with the diseased residues, and the ascospores cause initial infection under suitable conditions in the second year, and the diseased grows conidia for re-infection. It mainly overwinters with mycelium or ascomycetes left in the soil with the diseased residues, and after the initial infection is caused by the ascospores emitted in the following year, the diseased part produces conidia for re-infection. This bacterium is a weak parasitic bacterium, which is often mixed with downy mildew or purple spot disease.

The pathogen has a wide range of development temperature, requires high humidity, the onset of the disease depends on the temperature sooner or later, and the severity of the occurrence depends on the humidity, and there are two peaks of incidence from November to December and April to May in spring. Due to the good permeability of sandy soil, a large amount of chemical fertilizer will penetrate into the lower layer of the soil, and reduce the concentration of soil solution, so there is rarely the phenomenon of root burning. Garlic red leaves may be caused by phosphorus deficiency or diseases such as white rot.

The <> is gray-white or gray-brown, and the diseased part produces black mold, and the diseased leaves die in severe cases. If the flower sprout is damaged, it is easy to break off from the diseased part, and finally many small black dots are scattered in the diseased part. In the garlic seedling stage, heavy watering and poor soil conditions cause the root respiration to be blocked, and the absorption of nutrients is impaired and the leaves are red.

Secondly, the low soil temperature reduces the absorption rate of phosphorus by plants, so that the nutrients produced by the leaves cannot be transported, and the leaves produce redness.

The reason for the appearance of garlic purple spot is that it is more likely to develop in a humid environment, so the occurrence of garlic purple spot will be aggravated in warm and humid areas. The occurrence of the disease is also very related to planting, it is observed that the occurrence of garlic purple spot disease is relatively serious in the plots with high garlic planting density, the plots with excessive nitrogen fertilizer, the plots with heavy crop planting, and the plots with relatively poor soil. The control method is to choose disease-free and disease-resistant garlic species as much as possible, and do not show insect bite traces of garlic species, so as to improve the quality of garlic seeds and reduce disease infection.

Clean up the disease residues in the field, reduce the number of pathogens in the field, garlic in the harvest, to the leaves and plants that have fallen in the field, especially the plots that have occurred purple spot disease, the cleaning work should be more thorough, the disease residues are cleaned out of the field in time, reduce the parasite and number of pathogens in the field. Sowing seeds at the right time and planting them reasonably and densely have a good effect on reducing the occurrence of garlic purple spot.

It may be that the land is very moist and particularly barren. You can choose some good ones in the selection of plants, you can adjust the spacing reasonably, you can pay attention to it when fertilizing, and use some drugs in moderation.

The reason for garlic purple spot disease is that in winter, growers do not remove diseased leaves in time, and usually do not pay attention to spraying pesticides to prevent pathogenic bacteria. Therefore, in winter, the pathogenic bacteria parasitize the garlic with mycelium and overwinter with the diseased residues. In warm, rainy and humid climates, especially when returning to the south of the day, pathogenic bacteria invade the inside of garlic through wounds or through the skin of garlic, and then spread to more places with the help of air and water.

Pharmaceutical prevention and control: In the early stage of the disease, carbendazim, chlorothalonil, methalonil, manganese-zinc, prochloraz and other drugs should be treated once every 7 days, 2-3 times in a row. Pay attention to medication rotations.

First, garlic pests and diseases are unprecedentedly and seriously rampant, garlic white rot, leaf blight, dry rot, downy mildew, phytophthora and purple spot are serious above-ground diseases. <>

Jumping garlic is what we usually call jumping cloves, jumping garlic, refers to the garlic after sowing when it begins to take new roots, sometimes the garlic cloves will be exposed to the soil surface or very close to the ground, this situation is easy to make the garlic cloves gradually die due to drought resulting in lack of seedlings or broken ridges, garlic planting too late is an important reason why garlic does not come out of moss. We plant garlic here between October 1st and 10th of the solar calendar, but if you plant too late, garlic will not grow to 3-5 leaves in winter.

The secondary growth phenomenon is also known as the regrowth phenomenon of garlic degraded leaves, commonly known as horsetail garlic, which refers to the garlic sprouts at the same time as the garlic sprouts are exposed, and a circle of small garlic leaves grows around the garlic sprouts, and these leaflets grow around the garlic sprouts, and the growth point of the new garlic cloves does not have any germination. Improper management of "green head garlic", "flowering loose garlic", onion-like "aerial garlic", etc., these are all abnormal phenomena in garlic production, and these garlic abnormalities are irreparable after being found in garlic production.

It is best to choose garlic varieties with strong resistance to stress, generally planted as garlic, and it is advisable to sow seeds from early September to early October every year, and not more than mid-October at the latest. If it is planted as green garlic, it is advisable to sow it in mid to late August every year. After several years of continuous planting of garlic, the yield is difficult to break through, and the proportion of garlic is reduced!

The specific reasons are mainly as follows: 1. Heavy crop problem. The soil has not been deeply ploughed for many years, the soil is too hard, the lower part is too hard, and the air permeability is poor, which leads to the aggravation of soil-borne diseases, which will cause poor root growth.

When garlic is deficient in calcium, necrotic spots appear on the leaves, with the expansion of the necrosis class, the leaves bend downward, and the leaf tips die quickly, and calcium nitrate or calcium chloride can be sprayed when such symptoms appear, and now the base of the old leaves gradually develops to the leaf tips, and the leaves eventually die.

It will affect the yield of garlic, and after the occurrence of this disease, the growth of garlic is not good, and a large area of wilting will occur.

It has a great impact on garlic, and in this case, it will also affect the yield of garlic, and it will also lead to a decrease in garlic production, and it will also cause a lot of leaves left in the field after harvesting, which will also affect the properties of the soil.

If the disease is severe, the diseased leaves will be directly broken, which can quickly spread throughout the garlic field, directly reducing the commodity value of garlic and halving the yield.

After garlic is infected with purple spot disease, it will cause yellowing of leaves, lesions, twisted leaf tips, and if the damage is serious, the diseased leaves will be directly broken, once the garlic is infected with purple spot disease, it can quickly spread to the whole garlic field, the diseased plant rate can basically reach more than 90%, and the diseased leaf rate is between 70% and 90%, which directly leads to a great reduction in the commodity value of garlic in the plot and halves the yield.

It will affect the yield of garlic, and at the same time, the survival rate of garlic will not be high, and there will be a lot of decay, and it will also affect the nutrient absorption of garlic, and the color is not very perfect.

Garlic infection with purple spot disease will cause yellow leaf disease spots, the tip of the leaf is twisted, if the disease is serious, the diseased leaves will be directly broken, can quickly spread to the entire garlic field, directly reduce the commodity value of garlic, the yield is halved. The garlic from purple spot disease should be cleared out of the field to reduce the number of pathogenic bacteria in the field.

If there is purple spot on the garlic, it is best not to eat it, it is likely to be caused by purple spot infection. This disease is relatively harmful to garlic and will have a certain impact on the variety of garlic, so if it is garlic with purple spots, do not eat it, so as not to cause any negative impact on your health.

Can you eat garlic with purple spots on it.

If you have purple spots on the garlic, it is best not to eat it, most likely due to purpura infection.

This disease is relatively harmful to the garlic next to the rot, and it will have a certain impact on the varieties of garlic, so if it is garlic with purple spots, do not eat it, so as not to cause any negative impact on health.

Purple spot disease has a great impact on the yield and quality of garlic, and garlic production areas in various places have different degrees of occurrence.

Some people will say that purple spots on garlic may be caused by oxidation.

After the skin of garlic falls off, if it is exposed to the air for a long time, it will cause the loss of water in the garlic and the oxidation reaction will occur.

This will cause the color of the garlic to change, such as turning yellow or purple, and there will be purple spots on the garlic, but it will not produce toxic substances and will not cause physical damageSo you can still eat it, but don't eat it if it gets moldy!

But now with the improvement of garlic cultivation, there are two varieties of garlic, one is white and the other is purple.

The sprouted garlic has purple leakage on it, which proves that you are purple garlic. When the purple garlic first sprouts, the top of the head is purple, and the purple slowly fades to green seedlings, and the bottom part of the root becomes a red pole, which is the characteristic of purple garlic.

Purple-skinned garlic turns purple when it is ready to sprout. According to the color of the bulb skin, garlic varieties can be divided into two types: purple garlic and white garlic. Purple garlic has few but large garlic cloves, a strong spicy flavor, and a high yield.

There are two kinds of white garlic with large cloves and small cloves, the spicy taste is lighter, and it is cold-resistant than purple garlic, and it is sown in autumn and matures slightly earlier.

Tips for peeling purple garlic: Break the garlic into cloves, wash it and put it on the countertop, pat it flat with a knife, and the skin will fall off after the garlic clove breaks.

The garlic purple spot fungus is a bacterium known as Alternaria chives. The fungus overwinters in the form of hyphae or conidia attached to diseased organisms, seeds, and field soils. When the temperature is right the following year, the meristem begins to be damaged.

It has been observed that the occurrence of garlic purple spot disease is more serious in communities with high planting density, excessive nitrogen application, continuous cropping and poor soil. 1。Reasonable crop rotation.

It is recommended that garlic and grain crops be rotated (not rotated with onion and garlic crops) for about 3 years. Of course, it can also be determined according to the actual situation. In some cases, it may be 2 years or 4-5 years.

2。Choose disease-resistant garlic and spray carbendazim before sowing to reduce the occurrence of diseases and cultivate strong seedlings; Reasonable dense planting is conducive to ventilation and dehumidification, reducing the probability of disease occurrence and slowing down the spread of bacteria.