Gray leaf spot is the main disease of white garlic, what is the cause of gray leaf spot disease of w

Inject 4000 times of pyrethroid solution or avermectin solution into the root soil; You can also use sweet and sour liquid to trap adults, the proportion is 6 parts of sugar, 3 parts of vinegar, 1 part of liquor, 1 part of 90% trichlorfon powder, mix evenly in a pot, put it in the field, and wait for a sunny day to trap itLeaf blight: After the onset of the disease, spray 500 600 times of 50% tobuzin wettable powder, or 500 times of 75% chlorothalonil wettable powder, or 1000 times of 50% dry wettable powder for prevention and control.

Spray once every 7 days, 2 3 times in a row.

First of all, the garlic seeds that have been planted for many years should be replanted, and the land should be planted in rotation. In this way, it can also play a role in the prevention and control of garlic maggots. For the choice of garlic base fertilizer, it is best to choose fermented and rotted farmhouse fertilizer, or directly buy bagged organic fertilizer or biological fertilizer!

If it is a blackhead maggot (leek maggot, slender, with black spots on the head), it is recommended to use clothianidin, thiamethoxam, matrine and other control, and it is recommended to use cyhalothrin! In the prevention and control of blackhead maggots, clothianidin, thiamethoxam, and matrine are used, because it is mainly due to the effect of internal gastric toxicity, <>

It can be extended to the lower part after a few days. In the initial stage, the lesions are very small, slightly sunken, yellow-brown to brown, and when the humidity is high, the disease is full of brown to black powdery mold, and the lesions are often arranged in the form of concentric rings, and the lesions are often healed into long strip-shaped large spots, resulting in leaf death. As the name suggests, it is a pest that harms leaves with its larvae; The larvae can zigzag through the garlic leaves, sneak on the mesophyll, and you can see the winding serpentine tunnels on the diseased garlic leaves; Severe garlic leaves, leaving only two layers of transparent epidermis above and below, <>

Avoid continuous cropping or adjacent cropping with allium crops such as onions and leeks; apply well-rotted organic fertilizer and increase phosphorus and potassium fertilizer; Before sowing, the new high-fat film was used to dress the seeds, and the new high-fat film was sprayed in time after planting to keep warm and moisture to improve the seedling emergence rate. Reasonable dense planting, timely ditching and drainage, and reduce temperature. Strengthen field management, remove the disease residue in time, and concentrate on treatment, get it in time at the beginning of the disease, spray it with 75 chlorothalonil wettable powder 600 times or 70 mancozeb wettable powder 500 times, pay attention to spraying on the roots of plant stems close to the surface.

The gray leaf spots of white garlic are caused by the hyphal masses overwintering in the host diseased remains, and the next year conidia are produced to spread and spread. Due to the warm days and cool nights, foggy and heavy weather lead to severe illness.

The causative agent of gray leaf spot disease is C. alliflora, which is a fungus of the subphylum Semi-Know. The hyphaal blocks overwinter in the host disease residues, and the next year conidia are produced for transmission and spread. The days are warm and the nights are cool, and the weather with fog and heavy dew is severe.

There is a high probability of occurrence in the year when there is a lot of rainfall and heavy rainfall from March to May. This kind of disease mainly damages leaves, causing leaf death, and when it occurs severely, it causes the whole garlic plant to die.

The gray leaf spot disease of white garlic is parasitic in the host disease residue with mycelial blocks for overwintering, and the next year produces conidia for transmission and spreading, and the weather is warm and cool at night, foggy and heavy dew.

The pathogenesis is characterized by the hyphae overwintering in the host disease residue and the next year producing conidia for propagation. The days are warm and the nights are cool, and the weather with fog and heavy dew is severe.

There are white spots on the garlic moss, what kind of disease is this, and whether pesticides are needed or not.

Hello dear! There are white spots on garlic moss, what kind of disease is this, do you need to use pesticides: the white spots on garlic moss are formed by the death of plant fibers during the growth process Cut off directly, it is caused by drying, in the process of frozen transportation and stacking in the mountains, because of the difference in climate between the north and the south due to drying, if the garlic seedling leaves are distorted at the same time, you can consider the virus disease.

Viral diseases are also small liter white spots, which can be directly prevented and treated with agents such as chunleimycin or zinc azole and thiamethoxone.

The lesions are oblong. It is light brown at first, and then turns grayish-white, and the lesions on both sides of the leaves produce fine gray-black mold, and the severe lesions converge, resulting in local death of the leaves.

It is mainly harmful to leaves. The lesions are oblong and oval, 4 7 1 3 mm in size. At first, it is light brown, and then it becomes grayish-white, and the lesions on both sides of the leaves are slightly gray-black mold, that is, the dry body of the pathogen, and the severe lesions converge, causing the leaves to die locally.

The lesions are yellowish-white, pinpoint-shaped, water-stained, pale green, then oval or fusiform, parallel to the vein, withered yellow in the center, reddish-brown at the edges, and yellow at the edges. In the epidemic year, the disease spread rapidly, the leaves withered yellow, and the garlic seedlings died. It mainly harms leaves, often causing the death of diseased leaves, premature senescence of plants, reduction of garlic yield, and mildew of garlic sprouts.

With the continuous cultivation of garlic in recent years, I know more or less about the diseases of garlic. The fungal diseases of garlic mainly include garlic leaf blight, dry rot, gray mold, sclerotinia sclerotinia disease, purple spot, rust and other diseases. Long-term heavy planting of any crop will bring about the occurrence of some pests and diseases, and the longer the heavy crop planting, the more prone to pests and diseases.

For example, garlic fungal diseases gray mold, rust, etc. What do we need to pay attention to in terms of prevention and control? Garlic gray mold, not only threatens the healthy growth of garlic, but also causes a serious reduction in garlic production, farmers in the planting of garlic, to correctly identify the symptoms of garlic gray mold, rational use of medicine, timely **, reduce losses.

Garlic is an essential condiment for daily stir-frying, and the demand in the local market is relatively large, and it has very good economic value, so it is planted in a large area in rural areas. Garlic is one of the main cash crops for farmers to increase production and income, but it is susceptible to infection during growthGarlic white rot, gray mold and other diseases. Therefore, farmers need to do a good job in the prevention and control of planned diseases.

However, due to the relatively simple cultivation of garlic, many growers tend to ignore the key pest prevention work, and pest control is also the key to a good harvest of garlic. So what is the disease of gray-white hyphae growing on garlic stems, and how to effectively prevent and control it?

Garlic stems have grayish-white hyphae, which is actually the most typical symptom of garlic white rot. Garlic white rot is a fungal disease, between 5-30 degrees, the hyphae can grow, but at 20 degrees the fastest growth, lower than 5 degrees or more than 30 degrees, on the leaves of garlic are easy to breed some small white dots, these dots are gray mold, and these dots will gradually spread black, especially spread. These moldy polka-dot germs can spread the infection, exposing the whole garlic to disease.

Also known as mosaic disease, it is a worldwide disease, and it is also the most harmful and incidentious disease to garlic. Control methods: Implement more than 3-5 years of rotation with grasses and leguminous crops, and try to avoid green onions and onions.

Some pesticides should be used to prevent pests and diseases, and they should also be watered frequently, pay attention to soil problems, pay attention to light, and should also prune branches and leaves frequently, etc., these are all methods of prevention and control of white garlic gray leaf spot, which are very effective.

Garlic fields are cleaned frequently, and after the garlic is harvested, the leaves of the field are removed, and the ground before ploughing the soil is spread with straw and lit, so as to burn the pathogenic bacteria in the body of the diseased residue and reduce the number of overwintering bacteria in the field.

Remove the infested leaves in time.

Strengthen field management, reasonable dense planting, and timely drainage after rain to improve host disease resistance.

At the beginning of the disease, spray 600 times of 75% chlorothalonil wettable powder, 1500 times of 50% promextoin wettable powder, 500 times of 64% alum wettable powder, 500 times of 60% ethylphosphine wettable powder or 1 1 100 Bordeaux solution, take turns to administer the drug once every 7 10 days, and continuously prevent and control 3 4 times.

1) After harvesting, remove the diseased and residual bodies in time, and burn them or bury them deeply. (2) Strengthen field management and adopt formula fertilization technology to enhance parasitic disease resistance. Drain water in time after rain

You can spray pesticides in advance, and at the same time, you should also pay attention to the prevention of various germs, and you should eliminate the germs in the soil, choose suitable fertilizers, and also pay attention to the prevention of various pests and diseases in advance.

Large-scale irrigation and fertilization should be carried out in advance to ensure that these diseases do not occur, and drainage should be carried out in time to ensure that there is no stagnant water.

Mainly harms the leaves. The lesions are oblong, light brown at first, and then grayish-white, and the lesions on both sides of the leaves produce fine gray-black mold, and the lesions converge when they are severe, causing the leaves to die locally. The days are warm and the nights are cool, and the weather with fog and heavy dew is severe.

Symptoms are mainly harmful to the leaves. The lesions are oblong, light brown at first, then grayish-white. The lesions on both sides of the leaves produce fine gray-black mold spots. In severe cases, the lesions converge, causing the leaves to die locally. The days are warm, the nights are cool, foggy and dewy.

It may be due to too much fertilization or too much pesticide spraying, or it may be due to not paying attention to watering, which has dried up the land. It is also possible that the sunlight is too strong, which leads to the occurrence of pests and diseases. I think it's most likely because garlic leaves lack nutrients.

So when this happens to garlic, you must pay attention.

It was because of the excessive amount of water and the overheating of the weather, and when he became ill, there were many black spots on the yard, and the roots would turn yellow, and the leaves would also turn yellow, and there were signs of wilting.

The causative fungi of garlic gray mold are Botrytis allium and Vitis allium. Botrytis botrytis mainly occurs in the middle and late stages of garlic growth and during garlic moss storage. When the disease appears, the tip of the leaf appears water-stained lesions, gradually turning white to gray-brown, and developing into an oval shape along the leaf veins, it will begin to infect the plant, and it can also spread through wind and rain, expanding the area of infection, if the plant is weak, it is more susceptible to such diseases.

Initial stage of lesions: Small brown dots, gradually enlarged, initially round or nearly roundLate Stage:Restricted by the leaf veins, it is polygonal, and there are also lesions that are connected into patches into irregular shapes, and the middle of the lesions is gray-white or yellow-brown with high eggplant leakage, and the edges are brown with yellow halos.

Before the seedlings, the daily temperature in the shed is 25 to 30 degrees, and the night is about 18 degrees. When the young shoots are left in the soil, the temperature is kept at 20 25 degrees during the day and 10 15 degrees at night, if it exceeds 28 degrees, it is necessary to ventilate and cool down in time to prevent the plant from growing.

The affected leaves initially show yellow or green lesions, and a thick layer of gray-white mold is produced on the back of the lesions, which gradually turns purple-gray or black-brown. In severe cases, the leaves shrink, curl, or even dry out. The onset of the disease mostly starts from the old leaves and expands to the new leaves.

The pathogen is a semi-known fungus in fungi. As a result, there are germs remaining on the seeds, and by the second year, the temperature and humidity are suitable for their growth.

Increase the application of organic fertilizer, phosphate fertilizer and potassium fertilizer, remove the diseased residue in time after harvest, and release wind and humidity in a timely manner. Start spraying at the beginning of the disease, spray once every 7-10 days, 2 times in a row, and choose 500 times of Hisun-Bilu suspension for prevention, or spray 500 times with cultivated liters (copper succinate and succinate hydrochloride) ** can kill copper preparations such as three thousand to control the spread of the disease. When the disease is more severe, imidazolinoline copper + azole ether fluoramide can be sprayed; or copper imidazoquinoline + fluopyramide oxime, spray once every 7-10 days, and spray 2-3 times continuously depending on the condition, the effect is good.

Damage to the leaves will cause disease spots on the leaves, and they will always expand, and they will turn gray-white in the later stage, resulting in a large reduction in garlic production.

It will affect the growth of garlic, it will affect flowering, it will affect the fruit, it will make the garlic die, and it will make the farmer's investment go to nothing.

Gray leaf spot disease mainly grows on the leaves, resulting in oval lesions on the leaves such as limb pieces, and the leaves are brown at the beginning and then turn gray-white, and some black mold will grow around them, resulting in the death of the leaves. At the same time, he will get sick in an environment where the fog and humidity are particularly severe, and the temperature difference between day and night is large, and it is easy for the slag orange world to become ill in March and May.

The harm is still more serious, than Yu Qiliang said that it will cause the garlic to rot or the vertical width is rotten roots, and it will also cause the size of the garlic to become smaller and smaller, and the yield will be lower and lower, and it will also affect the quality of the child, but also affect the taste.

It is very resistant to rot and may cause the leaves to turn yellow, and there will be a large number of spots on the leaves, which will also lead to a sharp decline in the yield of garlic, and will also cause the growth and development of garlic to be hindered, and the limbs will also affect the harvest of farmers.

The most common diseases of garlic are blight, gray mold, white rot, purple spot and leaf blight, and the main insect pests are root maggots, aphids and allium thrips. According to the experience of planting garlic all year round, Liufang analyzes the specific control measures of the above pests and diseases, and the details are as follows: reducing pathogens and reducing the number of pathogens in the garlic growth environment is the basis for preventing the occurrence of diseases.

In the process of pollution-free pest control of garlic, this is a measure to draw wages from the bottom of the kettle. Most of the measures to reduce pathogens are agricultural.

Control measures: select varieties with strong disease resistance, close good seeds, eliminate diseased, insect and poisonous garlic species, avoid continuous cropping At the beginning of the disease, 1000 times of 10% mixed fatty acid water emulsion and 300 times of mushroom proteoglycan water solution should be sprayed once every 10 days for three consecutive times. After garlic is infected, it first occurs from the leaf edge and midrib, and forms yellowish-white stripes along the leaf margin or midrib, which can run through the entire leaf.

When the humidity is high, the diseased part is yellow-brown and soft rot. Generally, the foot leaves first develop the disease, and then gradually expand to the upper leaves, causing the whole plant to wither or die.

Leaf blight:Leaf blight is a common disease in the growth process of garlic, which mainly harms garlic and affects the yield of garlic. Prevention and control methods:

The onset of the disease usually occurs in mid-April, and if found, 100 grams of chlorothalonil wettable powder should be applied in time,。。 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.

The disease mainly harms leaves, leaf sheaths, moss stems and bracts.

Replace garlic varieties and choose disease-resistant varieties for planting, the so-called replacement of garlic varieties mainly refers to the first type of garlic seeds that have been sexually cultivated as garlic seeds. The second type is the garlic seeds that are planted on a land-swapped basis, and the garlic grown on sandy soil is reserved for garlic seeds. Scientific management of fertilizer and water.

The ditch system is matched to facilitate drainage and stain reduction, and the soil is cultivated and loosened in time after watering; Formula fertilization, cultivate strong seedlings, and improve disease resistance (resistance).