The special medicine to prevent and control grape downy mildew, what medicine can eradicate downy mi

Grape downy mildew mainly harms leaves, but can also infect young tissues such as young shoots, inflorescences, and young fruits. high humidity of the air and high soil moisture; The orchard is low-lying and poorly drained; Excessive application of nitrogen fertilizer, excessive tree vigor, poor ventilation and light transmission are conducive to the disease.

Prevention and control methods: Completely remove fallen leaves, prune carefully, cut off tendrils, diseased branches, diseased fruit ears, and remove them outside the facility or bury them deeply. Spray the tree guard general 1000 times the liquid to reduce the pathogen.

Spray 800 times of the new high-lipid film in the whole garden, quickly form a film on the ground to keep warm and moisture, inhibit the formation of sporangia, and prevent germination and infection of zoospores.

Before germination, the ground and plants are sprayed with 1000 times of the tree protection general solution to eradicate the pathogenic bacteria in the facility. After germination, spray a new high-lipid film to protect the shoots from the infection of external germs, and effectively prevent the spread of germs through air rain. During the flowering period and the growth and ripening period, the melon and fruit can be sprayed to increase the nutrient delivery of grapes and enhance their own resistance.

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.

"Redomir" from Switzerland, the mycelium dissolves immediately after a few minutes. If downy mildew is very severe and it is in time for the rainy season, you can use the method of directly mixing the high-concentration dilution of "Redomir" with Bordeaux liquid and spraying it, the effect is wonderful, this is my experience (experts, data say that it is not allowed to be mixed).

BASF Baitai Bayer Silver Fali.

Before the onset of the disease, the double sides of the leaves and the vines were sprayed with 200 times the old high-fat film (emulsion), and the disease began to attack from the back of the leaves, and was sprayed on both sides. taobao search "non-toxic high-lipid membrane".

1. Remove the source of bacteria, thoroughly clean the orchard in autumn, cut off the diseased shoots, collect the diseased leaves, and bury or burn them in a concentrated manner.

2. 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.

3. Select non-droplet antifogging film as the outer covering material of the facility, and cover the whole area of the facility with plastic film to reduce its air humidity and prevent fogging, and inhibit the formation and germination of sporangia and the germination and infection of zoospores.

4. The temperature and humidity in the intersection, especially after grape fruit setting, should be quickly warmed to more than 30 during the day, and try to maintain it at 32-35, so as to inhibit the formation, germination and spore germination and infection of sporangia with high temperature and low humidity.

At about 16 o'clock in the afternoon, the air outlet was opened for ventilation and humidification, reducing the indoor humidity, maintaining the night temperature at 10-15, and the air humidity was not higher than 85%, and the germination of sporangia and spores was inhibited with lower temperature and humidity to control the occurrence of diseases.

5. Rain-sheltered cultivation: Rain-sheltered facilities are built in the vineyard to prevent the splashing of rainwater, so as to effectively cut off the spread of grape downy mildew pathogens, and have obvious prevention effect on the disease.

The dormant period of the vine, downy mildew** and how to prevent it, simple and easy to understand.

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 diseases of grapes. 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.

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

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.

Downy mildew, also known as yellow leaf disease, is a common disease of grape melon and cucumber, the use of Olympian oxadone fluthiazole can protect pathogenic bacteria, especially for oomycosis with good bactericidal activity. Oxazolone has good bactericidal activity against oomycosis and early blight.

The most effective means to deal with this mildew is ventilation, it is best to choose some special agents for mildew, spray the agent evenly on the leaves of the grapes, and use it too many times in the town, so as not to cause resistance to bridging.

Bordeaux liquid can be used for spraying, and Bordeaux liquid can effectively inhibit this disease of grapes and have the effect of disinfection and sterilization.

Bordeaux liquid can be chosen. The effect of this solution is very good, it must be diluted with water when used, and organic fertilizer should be supplemented in time.