Disease is a major threat to the growth of grapes. In August, the rainfall in the north increased significantly. Some of the grapes that were planted in the open land had just begun fruit enlargement, and some were nearly mature. Downy mildew, white rot, anthracnose, room blight, brown spot, water jar disease, acid rot and other diseases also entered the period of prosperous development, with downy mildew and white rot being the most serious. However, many fruit growers do not have early prevention because they do not understand the law of disease occurrence, and when they become ill, they are not only difficult to achieve the expected control effect, but also increase the use of pesticides.
In fact, it is the best way to deal with all kinds of grape diseases. Because infective diseases have a process of infestation, morbidity, and re-infestation, it is often found that the lesions are late in the disease. It is difficult to take effective measures at this time. Therefore, early prevention is not only effective, but also the key to reducing the use of pesticides.
This requires us to correctly understand the growth patterns of grapes, the characteristics of diseases, the impact of weather on grapes and diseases, and pay close attention to the changes in the weather, and take targeted measures in advance. At the same time, we should pay attention to the main and secondary times, and focus on controlling major diseases such as downy mildew, white rot, anthrax, and room blight, timely killing of birds, and rational fertilization, which can effectively reduce acidosis, water jar disease, etc. The occurrence of secondary diseases.
Grape Downy Mildew
Like water and young organs, pathogens are sensitive to copper ions, azoxystrobin and so on.
1. Condition suitable for happening: cool and rainy weather with water droplets, the branches and leaves grow fast and dense, and the air is poor.
2. Prevention and control of key: Bordeaux mixture or azoxystrobin + copper preparations, and urea cyanide alternate application, prevent the invasion of bacteria, about 10 days again. Control the growth of new shoots, control the application of nitrogen fertilizer, and try to increase the ventilation and transparency of the orchard.
3. Spraying techniques: focus on spraying young leaves, and strive to uniform. Avoid spraying when there are drops of water on the foliage. White rot
Grape fruit particles began to turn color, especially after the bags were unwound, and wounds were more easily infested. The pathogens were resistant to copper, but they were sensitive to sulphur preparations such as thirams and captans.
1. Conditions that are suitable to occur: Fruits with high sugar content, high temperature, high humidity and hot weather, hail, storm, bird beak and bite causing wounds are more likely to occur.
2. The key to prevention and control: At the beginning of the color change phase, benzirconazole or propiconazole + thiram, azoxystrobin or pyraclostrobin + difenoconazole; Azole or pyraclostrobin + propiconazole capsules. At the same time pay attention to repellent birds to prevent biting fruit.
3. Spraying techniques: Focus on spraying ear and fruit, select high-quality medicines and dosage forms to avoid the harm of inferior agents on the fruit surface.
In general, before the turning of the fruit, the rainy weather, the key prevention and control of downy mildew, sprayed with Bordeaux mixture or other copper preparations, and azoxystrobin, oxazole, cymoxan, mancozeb , urea manganese zinc and other fungicides alternately or mixed; hot weather attention to anthrax, brown spot, etc., spraying difenoconazole, propiconazole, thiram, pyraclostrobin, etc.; color change period begins, Prevention and control of key to white rot, concurrent treatment of downy mildew, acid rot and anthrax, etc., immediately after bag solution with fenproconazole or azoxystrobin + difenoconazole capsule, and then, depending on the weather and Disease prevention and control of spraying, and do a good job of pest control work.
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