How to treat downy mildew in grapes? What to do if the grapes have downy mildew

Spraying control. 750 times of 50% Ruixin mildew wettable powder, spray once every 20-30 days; or 300 times of 40% mildew net wettable powder, sprayed once every 15 days or so, has an excellent effect on the prevention and control of grape downy mildew.

1. Eliminate the source of the disease. In late autumn, combined with pruning, completely remove diseased branches and leaves, ground residues, fallen leaves, and diseased fruits, and take them out of the garden to be buried or burned.

2. Scientific fertilization. Increase the application of decomposed organic fertilizer and phosphorus and potassium fertilizer to improve disease resistance.

3. Strengthen management. Pruning in time, breaking the secondary shoots in time, topping, and removing the long branches, prevent the branches and leaves from being too densely crowded, so that the branches, leaves, and fruit retention maintain an appropriate proportion. Attention should be paid to ventilation and moisture removal, temperature and light management. In addition, disease-resistant varieties are selected.

4. Spraying protection. Seize the critical moment before the initial infection of the germ, spray Bordeaux liquid, must choose high-quality quicklime and copper sulfate, prepared in the right way, after the first spray, spray once every half month, generally spray 3 to 4 times, you can achieve a good preventive effect. Due to the characteristic of the invasion of pathogens from the stomata on the back of the leaf, the focus of spraying is on the back of the leaf.

This is an effective experience in preventing the occurrence of downy mildew and saving money, especially for the development of pollution-free grapes. This experience is worth learning from.

Summary. Hello, glad to answer for you. Grape downy mildew is a disease that occurs on grapes caused by unaxial mold infestation of grapes. Grape downy mildew only affects the young tissues of the aboveground part of the grape, such as leaves, shoots, flower spikes and fruits.

Grape downy mildew.

Hello, glad to answer for you. Grape downy mildew is a disease that occurs on grapes caused by unaxial mold infestation of grapes. Grape downy mildew only affects the young tissues of the aboveground part of the grape, such as leaves, shoots, flower spikes and fruits.

The control methods of grape downy mildew include agricultural control and pesticide control. It is mainly to remove the sick and disabled bodies and reduce the germs. During the growing season or dormant season, the dead branches, fallen leaves, diseased branches, and diseased fruits are cleaned up and buried or burned in a concentrated manner.

Reduce orchard humidity: drain in the rainy season, ventilate the shelf surface, improve irrigation facilities, timely cultivation and weeding, and it is best to implement rain-sheltered cultivation.

Ethyl phosphorus aluminum is a special drug for the treatment of downy mildew (also known as epidemic frost), sprayed with 1000 times liquid. Nothing else matters. Ruifumycin is also OK, but Ruifuxin is a biological agent, which is easy to lose its activity, and most of the drugs are spoiled.

The following measures should be taken to control downy mildew in grapes:

1) Choose disease-resistant varieties.

Through cross-breeding and grafting, varieties of the American series are selected as much as possible, because American grapes are more resistant to disease than European varieties, such as varieties Combare and Moldova.

2) Strengthen vineyard management.

In spring, summer and autumn, diseased branches, vines and leaves should be pruned off; In the early stage, lime water was sprayed under the frame to kill the pathogenic bacteria in the diseased remains; Improve the height of the fruiting part and the scaffolding, timely topping, cultivating and weeding, ventilation and light transmission in the garden, and appropriately increase phosphorus and potassium fertilizer.

3) Spraying protection.

Copper preparation is a good agent for the prevention and control of downy mildew. Before the onset of the disease, combined with the prevention and control of other diseases, it can be sprayed with 1 times of Bordeaux solution, 600 times of 80% mancozeb wettable powder or 500 times of 70% mancozeb wettable powder. Seize the critical period of the initial infection of the fungus spray, spray 1 time every 10 15 days, the above agents can be used alternately, 3 5 times in a row, the front and back of the leaves should be sprayed evenly, in order to achieve good control results.

Immediately after the center point of the diseased leaf was found, spray 200 300 times of 40% aluminum triethylphosphonate wettable powder, or 68% methampheta-manganese-zinc wettable powder 600 times, or 50% gramadan wettable powder 400 500 times, every 7 days or so, the above agents can be sprayed 1 time, can be used alternately, sprayed about 3 times, not only can control the occurrence of downy mildew, but also can treat powdery mildew, black pox, etc. When the disease is controlled, it will recover to 10 to 15 days and spray once the drug is sprayed.

The prevention and control of grape "downy mildew", first understand what downy mildew is, and then choose drugs!

With internal and external closed We often use: chlorothalonil, clomycium, white carrot, Bordeaux liquid.

Spraying sulfur is the cheapest and best.

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Grapes are infected with downy mildew, diseased leaves are scorched and fall early, diseased shoots are distorted, and growth is poor, which seriously affects the yield and quality of grapes. Grape downy mildew mainly harms leaves, but also can infect young shoots, flower buds and young fruits to remove the source of bacteria, thoroughly sweep the orchard in autumn, cut off the diseased shoots, collect diseased leaves, and concentrate on deep burial or burning.

1.Strengthen orchard management, timely summer pruning, tie up branches, and improve the ventilation and light transmission conditions of the shelf surface. Pay attention to weeding, drainage, and reduce ground moisture. Appropriate application of phosphorus and potassium fertilizer, and application of lime to acidic soil to improve plant disease resistance.

2.Chemical control: key prevention: Jiayuan special Heqing 1500 times or copper noble 600 times + Ye Jiamei 1000 times.

3.Timely**: Immediately spray the Homestead Super Downy Mold Pack (Marlene Sim 1500 times + Super Sharp Effect 1500 times) as soon as downy mildew is found.

I think this grape downy mildew is like ringworm on the face in spring, pay attention to hygiene, pick up the bad leaves, and clean up well.

Search for "grape downy mildew", there are medicinal methods in the encyclopedia, and I will not copy it. Actually, I'm looking at this question to find some questions to ask in Kaiyi's little grape doctor, and I'll add it to you when there will be an answer.

Spray copper preparations. Copper preparation is a good agent for the prevention and control of downy mildew, once it is found that grapes have a tendency to get downy mildew, copper preparations should be sprayed on grapes in time, which can effectively prevent and control.

The prevention and control of grape "downy mildew", first understand what downy mildew is, and then choose drugs!

1) Choose disease-resistant varieties. 2) Strengthen vineyard management. 3) Spraying protection. Clean the orchard, reduce the source of disease, strengthen the management of cutting and training, and optimize the orchard environment.

Grape downy mildew is the best direct spray with 80% enoylmorpholine on grape seedlings, which is known as a special drug, and it is also the most commonly used and effective ** agent at present.

Grape downy mildew is a worldwide grape disease. It is distributed in all grape producing areas in China, especially in rainy and humid areas, and is one of the main grape diseases. It was discovered in wild grapes in the United States in 1834.

The occurrence of this disease was recorded in China in 1899. When the disease is severe, the leaves are scorched and fall early, the growth of new shoots is poor, the fruit yield is reduced, the quality is deteriorated, and the cold resistance of the plant is poor.

Grape downy mildew is best sprayed with 80% enoylmorpholine + 80% mancozeb directly on grape seedlings.

My grapes have downy mildew, what is the best medicine to spray.