Grape cob brown blight affects yield, how to prevent and control grape cob brown blight?

Cob brown blight is harmful to the flower buds and young fruit spikes and young fruit grains of grapes. The light brown lesions with inconspicuous edges are produced on the cobs of flower buds or young fruit spikes until the entire cob loses water and dries up, and the fruit shrinks and dries up. Lesions into scabs grape cobs brown wilt belongs to the subphylum Semi-Knowing Fungi, know that it is a fungus, then you know what fungicide should be used in the prevention and control, but the occurrence of any disease, there are inducements for its occurrence, only by mastering the law of its pathogenesis, can we better prevent and control.

The main cause of grape cob brown wilt is caused by excessive air humidity during the flowering period, low temperature and rain, long growth period of cob, long lignification time, and unhealthy grape vines are more prone to disease.

The grapes infected with gray mold have brown rot and gray mold on the skin, while the cob brown wilt has scabs and black mold on the skin. Kaiser, Bai Kede, Park Hain, Suklin, Pyrimycosamine, Metro, Fungus, Kinder, Huiyou, etc. But most gray mold will burn, and many of them can't be beaten when they see hair, so the choice of medicine is not without skill.

The most prominent feature of gray mold is that there is a gray mold layer on the diseased side, and the lesions often expand in a V-shape from the tip of the leaf to the inside when the leaf is onset, and the diseased part is easy to rot.

Grapes enter the reproductive growth period, the demand for nutrients is very large, the weak tree is more susceptible to disease infection, this period, the occurrence of common gray mold and cob brown blight, a large number of flowers and young fruits dry up and fall after grape infection, at the beginning of the disease, the branches of young spikes, the cob becomes brown, and gradually die, and soon loses water and dries up, turning black and brown. When the flowers are open, they can also infect the corolla. When the weather is humid, gray-black mold is produced on the surface of the diseased part, and the main period of invasion of grape cob brown blight is from inflorescence separation to flowering, and there is also a disease (gray mold) in the same period, which has certain similarities in terms of occurrence conditions, occurrence nodes and symptoms.

Common grape diseases are: grape cob brown blight, gray mold, powdery mildew, anthracnose, black pox, white rot, sunburn and other diseases, to introduce how to prevent and control grape cob brown blight.

The following measures should be taken to control grape cob brown blight:

1) Clean the orchard:

Clean up the diseased branches and vines in the garden in time, combine pruning in winter, remove diseased branches and leaves, and burn them in a centralized manner.

2) Strengthen cultivation management

Control the amount of nitrogen fertilizer, increase the application of phosphorus and potassium fertilizer, and at the same time do a good job in the ventilation and light transmission of orchards, drainage and humidity reduction.

3) Pharmaceutical protection:

Spray 1500 2000 times of 25% azoxystrobin suspension once before flowering, or 600 times of 75% chlorothalonil, or 600 times of 80% mancozeb. After flowering, spraying 10% difenoconazole water dispersible granules 2000 times, or 25% azoxystrobin suspension 1500 2000 times can effectively control cob brown blight.

1. Disease-resistant varieties are selected, and Jufeng grapes are highly susceptible to cob brown blight. For Kyoho grapes with weak trees, poor growth, low uniformity and large tree age in the greenhouse, it is recommended to replant them after uprooting. Choose varieties with high quantity, good market efficiency and strong disease resistance, such as drunken golden incense, jasmine incense, sunshine rose, Yuexiang seedless, Xiangyue and so on.

2. Select high-quality greenhouse film and mulch film, eliminate low-quality greenhouse film, and select high-quality non-drip film to reduce water droplets in the greenhouse; At the same time, the mulch film should be covered tightly, and drip irrigation or dark irrigation under the film should be used to reduce the humidity in the greenhouse and control the humidity in the greenhouse between 50% and 70%.

At this time, you can use some drugs with relatively high chemical content, and the general sterilization effect of these drugs is relatively good, and you can also choose some farm fertilizers or organic fertilizers, nitrogen fertilizers, phosphorus fertilizers and the like.

Summary. Dear, I'm honored to have your question The information that the teacher found for you here is: grape cob brown blight, what medicine can be used to treat grape cob brown blight, and azoxystrobin can be used; Azoxystrobin.

Spray 25-50 ml of azoxystrobin per acre, because it has a validity period of about 15 days, so it can be sprayed again after 15 days. Difenoconazole. Add 50-65 grams of difenoconazole per 100 liters of water, mix well and spray evenly on the vines.

Flusilazole. In the early stages of cob brown blight, vines can be sprayed with 20% flusilazole 1500-2000 times, every 7-10 days, generally continuously4

Grape cob brown blight, what medicine can be used to cure it.

Dear, I'm honored to have your question The information that the teacher found for you here is: grape cob brown blight, what medicine can be used to treat grape cob brown blight, and azoxystrobin can be cured; Azoxystrobin. Spray 25-50 ml of azoxystrobin per acre, because it has a validity period of about 15 days, so it can be sprayed again after 15 days of lead.

Difenoconazole. Add 50-65 grams of difenoconazole per 100 liters of water, mix well and spray evenly on the vines. Flusilazole.

In the early stages of cob brown blight, vines can be sprayed with 20% flusilazole 1500-2000 times, every 7-10 days, generally continuously4

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Cob brown wilt is a common disease in viticulture. It appears on spikes, inflorescences, and young fruits. Shaft and peduncle damaged.

It starts as light brown spots and expands into dark brown slightly concave spots. When the humidity is high, a brown mold layer appears. When the lesion surrounds the peduncle or stem for a week, the buds or young fruit on it shrivel, dry and fall off.

In severe cases, almost all production declined, resulting in a sharp drop in production. The young fruit is damaged, with dark brown round spots, about about the diameter, and only the pericarp is damaged. With the increase of fruit quantity, scab and lesion shedding had little effect on yield.

The pathogenic bacteria overwinter on the scales and epidermis of plant buds with conidia and hyphae. In the spring of the following year, the inflorescence extends to the front and back of flowering and overwinters. New conidia are spread by wind and rain, infecting young stems, axes, and young fruits.

The low temperature of May-June favors the infection and spread of pathogenic bacteria, resulting in a large number of flowers and fruits. The orchard is low-lying, with poor ventilation and light transmission, and serious diseases. The rainy season in the south is conducive to the occurrence and spread of the disease.

Control methods: Agricultural control: choose disease-resistant varieties.

Controlling the amount of nitrogen fertilizer, increasing the application of phosphorus and potassium fertilizer, and at the same time doing a good job in the ventilation and light transmission of the orchard, drainage and humidity reduction, also has the effect of reducing the incidence of disease. At the time of 4 to 5 leaves of grape leaves, topping, tendrils, pruning and controlling shoots, so that the branches accumulate nutrients. Remove diseased branches and fruits, destroy them in a centralized manner, and eliminate the source of overwintering bacteria.

Pesticide control: After the grape buds germinate, spray 3 Baumé stone sulfur mixture, focusing on spraying the mother branch to eliminate the source of overwintering bacteria. The key period of spraying is from the cob extraction to the accelerated expansion of the fruit, spray 50% methyl tobuzin wettable powder 1000 times, or 42% Dasheng water-rich agent 600 800 times, polyantimycin 500 times, 40% Ketodan wettable powder 500 times.

For shed cultivation, 800 times of 50% methyl tobuzin wettable powder, or 600 800 times of 75% chlorothalonil powder were used alternately.

It should be necessary to buy some relevant drugs for spraying, and it is also necessary to pay attention to a series of changes in the growth process of grapes. It should be saved. If you find it in time, you can save the grapes.

I think if you want to prevent and control, then you must choose the soil is more fertile and wide when planting, and you must use farmhouse fertilizer when fertilizing, do not use fertilizer bought outside, but also often water the plants, but also to prevent the occurrence of pests and diseases, if there is a situation of small insects, then you must spray insecticides in time. So I think there is still salvation.

Regarding the occurrence of panicle brown blight in grapes, first of all, we should clean up the weeds in the vineyard in time to let it absorb nutrients well, and then, give fruit and vegetable medicine as soon as possible ** to avoid more serious consequences, and we need to always monitor the cultivation of grapes. So I think that if you do these things well, the grapes can still be saved.

In the process of planting, some pesticides or insecticides should be sprayed in the soil, so that it can be prevented. And of course, there is salvation.

How to control grape cob brown spot disease What are the methods Generally speaking, grape cob brown rot mainly harms the young buds or young fruits of grapes, causing them to shrivel and dry up, resulting in a large number of flowers and fruits falling. The occurrence law and control measures of grape stem brown spot disease. Regularity and high humidity are the main reasons for the prevalence of brown spot disease on grape stems.

Low temperature and rainy weather from early May to mid-June are conducive to bacterial infection, and low temperature and rainy weather during flowering are conducive to disease spread. Vineyards with low terrain, overwatering, poor ventilation and light transmission, extensive field management, insufficient fertility, and weak trees are seriously ill. When the grapes reach the size of soybeans, the disease stops spreading.

Control measures: To prevent and control grape cob brown spot disease, the following measures can be taken.

Clear the garden in time, remove diseased branches and fruits, and destroy them in a centralized manner to reduce the source of overwintering bacteria. Wipe the whole seedlings, wipe the buds, pluck the top, prune the fruit branches in time, and improve the ventilation and light transmission conditions.

The occurrence law of grape stem blight and its prevention and control measures. The third is to apply fertilizer reasonably, increase the application of organic fertilizer and phosphorus and potassium fertilizer, and control the application of nitrogen fertilizer to enhance the disease resistance of plants. Clean up the ditch system, open up a set of ditch system, and reduce the humidity in the field in rainy days.

Chemical control, after grape bud germination, spray stone sulfur mixture on the fruiting mother branch to eliminate the source of overwintering bacteria; After the grape leaves are complete, spraying 80% mancozeb wettable powder, 78% mancozeb wettable powder, 50% Fumei double wettable powder and 50% iprodione wettable powder have a certain protective effect. 50% carbendazim wettable powder, 70% methyl tobuzine wettable powder, 50% chlorothalonil suspension and 400 g l pyrimelamamine suspension could be used for spray control during inflorescence separation and one week after flowering.

When the humidity of the protected area is high, pyrimethium or pythium can also be used for smoking. Pay attention to alternate medications to delay the emergence of antimicrobial resistance of pathogenic bacteria. When spraying, the sprinkler head is 30 cm away from the receiving part, and the spraying is uniform and thorough.

The best way is to spray some pesticides, because pesticides can achieve a curative effect, so that the plants can grow better, if not sprayed with some pesticides, it will easily lead to diseases.

Timely removal of diseased branches and fruits, centralized destruction, and controlled application of nitrogen fertilizer can enhance the disease resistance of plants. Chemical control, focusing on spraying fruiting mother branches with stone sulfur mixture to eliminate the source of overwintering bacteria.

Choose disease-resistant varieties and clean them up. Eliminate overwintering sources and strengthen field management. Chlorothalonil or mancozeb powder can be sprayed before and after grape flowering.

It is called Alternaria vitrios, which is a fungus of the subphylum Semi-Knowitives. Several conidia peduncles. clumped, unbranched, brown to dark brown, pale at the tips.

Conidia are solitary or 4-6 clusters, with 9 individual clusters at the apex of the conidia, chain-shaped. It is best to spray the young grape fruit 10-20 days after the full flowering period, which can significantly improve the fruit setting rate, and can increase the fruit, and the yield can be increased. On Kyoho grapes, spraying before flowering can increase the fruit set rate and the number of spikes, which can make them have a high seedless rate and an average weight of seedless fruits.

Brassica gibberellic acid is mainly used to promote flowering and improve fruit setting rate in fruit trees, and is generally used in the flowering or young fruit stage. During the grape flowering period, 800 1600 times of the preparation can be used, and the stems and leaves can be evenly sprayed. Brassica gibberellic acid should not be mixed with commonly used neutral and acidic pesticides, and the best effect is mixed with micro fertilizer.

You can spray, but the dosage is small and the water is mixed with more to avoid hurting the grape blossoms.

At the beginning of the disease, the branches and cobs of the young spikes turn brown, and gradually die, and soon they lose water and dry up, turning black-brown. When the flowers are open, they can also infect the corolla. When the weather is humid, gray-black mold is produced on the surface of the diseased part, which generally rarely expands to the main cob, and the first 7 days to the flowering period is the main infection period of the pathogen, so the protection before flowering is very critical, and the agent can be azoxystrobin, mancozeb, pyraclostrobin, etc., and the initial stage can be used Winji (75% oxime tebuconazole dry suspension), tebuazole isprodione, frosturea manganese zinc, etc.

In addition, this product should be sprayed in the morning or evening, and it needs to be sprayed in case of rain within 6 hours after spraying. Use 4 8 days after flowering (from the full flowering period to the early stage of physiological fruit drop) or the dispensed agent should be evenly soaked in the fruit ears or sprayed at one time, if the flowering is not neat, it needs to be treated in batches, and the treatment should be carried out on the first day after the flowering. More than 10 days after flowering, the effect of treatment is not good.

It belongs to the genus Alternaria spp. of the fungal kingdom Asexual ascomycetes. The conidia are clustered with several roots, unbranched, brown or dark brown, and the tips are lighter. Conidia are solitary or 4-6 clusters, with 9 individual clusters at the apex of the conidia, chain-shaped.

The conidia are inverted club-like and have a smooth outer wall.