Talking about the Identification of Three Common Diseases of Lettuce and Its Control Measures
The farmers have noticed that in the rainy weather, we should pay attention to distinguishing the three diseases of lettuce, namely, downy mildew, powdery mildew and gray mold. Let's learn how to distinguish the three diseases of lettuce from the small series of Huinong. Prevention.
First, the method of identification
1. From the following hazard characteristics can be identified as downy mildew:
2. The occurrence of powdery mildew has this hazard characteristic:
3. The harmful characteristics of gray mold are also different:
The onset conditions of these three diseases are similar, and they are usually mixed in the field, which makes it difficult for the vegetable farmers to distinguish, which leads to the inability to prescribe the right medicine and increases the risk of loss.
Second, the disease conditions
The prevalence conditions of these three diseases are as follows:
1. The infection temperature of the pathogen is 15~17 °C, and it is easy to occur when the greenhouse or open field reaches this environment;
2. The fog is heavy and the water is heavy under high humidity;
3. The soil is sticky, low-lying land, and the partial application of nitrogen fertilizer is heavy.
Note: In fact, the prevention and treatment of disease is best to start with the disease conditions, improve the environment for good food growth, and prevent contact and infection of the bacteria.
Third, prevention and treatment reminder
1. Regardless of the greenhouse or the open field, observe the changes in the weather in real time, and timely ventilate and dehumidify;
2. Watering properly, draining in time, and not letting the ground get too wet;
3. Reduce the use of nitrogen fertilizer, increase the application of organic fertilizer and phosphorus and potassium fertilizer;
4. Discover the diseased plants, remove the diseased leaves, diseased plants, etc. in time, and add chemical control to prevent rapid infection of the bacteria.
Note: The prevention and treatment of any disease pays attention to a "prevention-based, comprehensive prevention". I don't know if you can do it. At the same time, "the right medicine" is also a key point. After the onset of the crop, we try to identify what kind of disease, downy mildew is waiting for the disease caused by the fungus, while white powder and gray mold are caused by higher fungi, and their respective medications are very different. Can't tell the difference, you can mix drugs.
Fourth, prevention and treatment
For these three diseases, the recommended medications are as follows:
Note: This form is for reference only.
The above is all the content of today, if you have better pharmacy use, please leave a message below the comments.
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