What is the reason for the appearance of spots on lettuce leaves?

Lettuce is one of our daily vegetables, it tastes good, nutritious, and unique eating method, planting management is simple, many people will plant some at home, pick and eat, but when planting lettuce leaves will appear spots, these spots will also spread. What's going on? Let's take a look at the detailed introduction.

1. Black spot

Spots may be due to black spot disease, black spot disease first from the outer leaves, from bottom to top, the leaves appear yellow-brown water stains, with the development of the disease, the disease spots gradually expand into round or irregular yellow-brown dead spots. In a humid environment, the disease spot will appear gray-black mildew layer, in a serious condition, the disease spot will connect into blocks, resulting in leaf yellowing and death, until the whole plant dies.

2. Brown spot

It is also possible that when brown spot disease occurs, the leaves appear light yellow water-stained spots, with the development of the disease, gradually spread into round or oval dead spots, in the air humid environment, the leaves will appear gray-brown sparse villous mold. When the disease is serious, the disease spots of the leaves will also be connected into blocks, forming a large area of necrotic spots, resulting in premature senescence and death of the leaves. These two diseases are similar and difficult to identify in the early stage of disease, which needs to be paid attention to.

3. Leaf spot

Leaf spot disease starts from the leaf edge, with the development of the disease, the spots will gradually spread, and these spots will also be covered with small black particles, which are the pathogen of leaf spot disease, which will infect the whole plant when the disease is serious. until the plant withered and did great harm.

4. Prevention and control methods

We must pay attention to the prevention and control of the diseases of lettuce, and give priority to prevention. Most of these diseases occur during the Meiyu period, when the humidity is high, which can easily lead to the growth of bacteria, so we should pay attention to the measures of drainage and humidity reduction, and at the same time, do a good job in the regulation and control of temperature. if the temperature difference between day and night is too large, it will lead to the decline of the resistance of lettuce, and the disease can be taken advantage of. When sowing, the seeds and soil should be disinfected, when the disease occurs, the diseased plants should be pulled out and taken out of the field, and the disinfection of the disease points should be done, and all the disinfectants should be sprayed for prevention and control.

The above is the introduction of the reasons for the spots on lettuce leaves. I hope it can help you. If you want to know more about it, please follow us.