What's the latest potato leaf yellowing?

Potatoes are potatoes, which contain a lot of starch, which is also the main energy we eat when we eat potatoes. And the content of protein is also high, which can promote the growth of the human body. Growing potatoes has become one of the poverty alleviation programs for many people, but many friends do not have a correct method of growing potatoes. Lead to many problems in the planting process, such as leaf yellowing is one of them. So what is the reason for the yellowing of leaves? Let's take a look at it. .

1. Late blight

Late blight is one of the common diseases of potatoes. Plants infected with late blight will start from the lower leaves. There are many waterlogged dark spots on the surface of diseased leaves, and then gradually expand, and the spots fuse together to form patches of different sizes. The leaf edge of the plaque begins to turn yellow and begins to develop toward the center, causing the leaves to turn yellow. Late blight can be treated with frost urea cyanide manganic zinc and other agents, and attention should be paid to prevention.

2. Verticillium wilt

Verticillium wilt is a soil-borne disease that attacks the roots of plants and then begins to spread upward. After root infection, the pathogen will destroy the vascular bundles in the plant, resulting in great hindrance to the absorption and transport of nutrients. The plant is lack of nutrition, and the leaves gradually turn yellow from the veins, and finally form a yellowish brown. After the disease, the growth of the plant became extremely yellow, the whole plant showed a weak phenomenon, and died in the later stage.

3. Early blight

Early blight, like late blight, harms the leaves of plants, especially those that are not picked in time. After the disease, the leaves will appear a variety of dark spots, and then gradually expand into patches. The leaves with patches will begin to fade and yellowing, and finally the whole leaf will fade, dehydrate and die. In the tuber expansion period is the high incidence of early blight, spraying mancozeb and other agents in advance to prevent.

4. Potassium deficiency

Potato demand for potassium is relatively high, potatoes in the growth process of potassium deficiency will cause leaf tip and leaf edge rot, gradually from green to yellow. When there is a severe lack of potassium, the leaves will curl together and break as if they had been dried by the sun. And it will also increase the phenomenon of fallen leaves, which has a great impact on the growth of plants. We should timely use phosphorus and potassium power and other agents to spray potassium.

5. Lack of nutrition

Just said that potassium deficiency will lead to leaf yellowing, in fact, the lack of various nutrients will cause this phenomenon, because potassium deficiency is more common, so I will talk about it alone. When fertilizing, many farmers do not reasonably control the proportion of nutrients in fertilizer, resulting in plant growth nutritional disorders, such as nitrogen deficiency thioenzyme will make leaves appear a variety of abnormal conditions. If these elements are not replenished in time, the whole plant will eventually show symptoms of element deficiency.

There are several reasons for the yellowing of potato leaves, most of which are caused by diseases, and the threat of diseases to plants is far more than these. The yellowing of leaves will reduce photosynthesis, can not increase the nutrient accumulation of plants, hinder the expansion of tubers, affect the quality of tubers, and lead to a certain threat to their own economic interests. This is the end of today's introduction, we must reasonably control the proportion of fertilizer nutrition in order to reduce or put an end to this phenomenon.