Responding to grape disease prevention is more important than treatment

Disease is a major threat to the growth of grapes. In August, the rainfall in the north has increased significantly. Some of the grapes planted in the open field have just begun to expand, and some are close to color. Downy mildew, white rot, anthracnose, house blight, brown spot, water jar disease, acid rot and other diseases have also entered the prosperous period, especially downy mildew and white rot. However, many fruit farmers do not understand the law of disease occurrence, and do not prevent it early. When the disease is ill-fated, it is not only difficult to achieve the expected control effect, but also increase the use of pesticides.

In fact, it is the best policy to deal with all kinds of diseases of grapes. Because invasive diseases have a process of infection, morbidity and reinfection, it is often found that the disease is late in the disease, and it is difficult to take measures at this time. Therefore, early prevention can not only achieve twice the result with half the effort, but also reduce the use of pesticides.

This requires us to correctly understand the growth rules of grapes, the characteristics of diseases, the impact of weather on grapes and diseases, pay close attention to weather changes, and take measures in advance. At the same time, we must pay attention to the main and secondary times, focusing on controlling major diseases such as downy mildew, white rot, anthracnose and blight, timely killing birds and killing insects, and rational fertilization can effectively reduce acid rot, water tank disease, etc. The occurrence of secondary diseases.

Grape Downy Mildew

Like water and young organs, the bacteria are sensitive to copper ions, azoxystrobin and the like.

1. Suitable conditions for occurrence: cool and rainy weather with water droplets, branches and leaves grow fast and dense, and poor ventilation.

2. Key to prevention and control: Bordeaux mixture or azoxystrobin + copper preparation, and oxazoleÂ·cream urea cyanide alternately sprayed to prevent the invasion of germs, about 10 days. Control the growth of new shoots, control the application of nitrogen fertilizer, and try to improve the ventilation and transparency of the orchard.

3. Spraying technique: focus on spraying the young leaves and strive to be even. Avoid spraying when there are water droplets on the leaves. White rot

The color change period of the grape fruit begins, especially after the bag is unpacked, and the wound is more susceptible to infection. The bacteria are resistant to copper, but sensitive to sulfur preparations such as thiram and captan.

1. Suitable conditions for occurrence: high-sugar fruit, high-temperature, high-humidity, hot weather, hail, storm, and bee stings are more likely to occur after wounds.

2. Key to prevention and control: start the color change period, spray difenoconazole or propiconazole + thiram, azoxystrobin or pyraclostrobin + difenoconazole; after dissolving the bag with phenyl ether Â· C Cyclic or pyraclostrobin + propiconazole. At the same time pay attention to the bird-repellent and anti-Wasps bite the fruit.

3. Spraying techniques: focus on spraying the ear and the fruit, choose high-quality medicines and dosage forms, and avoid the damage of the inferior medicine to the fruit surface.

In general, before the fruit color change, the rainy weather, focus on prevention and control of downy mildew, spraying with Bordeaux mixture or other copper preparations, and azoxystrobin, oxazole, cymoxan, mancozeb Alternating or mixing fungicides such as frost urea, manganese and zinc; pay attention to anthrax, brown spot, etc. in hot weather, spray difenoconazole, propiconazole, thiram, pyraclostrobin, etc.; The focus of prevention and control is changed to white rot, and mildew, acid rot and anthracnose are treated concurrently. Immediately after bag unpacking, benzepazole or azoxystrobin + difenoconazole is used, and then, depending on the weather. And the disease is sprayed to prevent and control, and do a good job of repelling birds and preventing insects.

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