Chlorosis, a rational disease of orchid peanut

Chlorosis, also known as chlorosis, most acidic soil flowers such as orchids, often appear this divine disease.

Symptoms: the leaves of the affected plants were yellow at the initial stage, followed by milky white spots, so that all of them became yellow and white, especially in the new leaves, and the tissue of the leaves was necrotic and brown in severe cases, affecting the normal progress of photosynthesis. if it is not treated in time, the whole plant can die.

Etiology: the disease is a physiological disease. There are many alkali salts in soil and water in most areas of the north, which can be used by plants to turn into insoluble trivalent iron ions in alkaline soil, so that plants can not absorb it. resulting in physiological iron deficiency in plants, resulting in chlorosis. This kind of situation often occurs in the situation of raising flowers in the south and the north.

Prevention and treatment:

(1) planted in acidic soil and often foliar sprayed with 0.1%-0.2% ferrous sulfate solution.

(2) sprinkling snow water or Rain Water.

(3) perennial application of alum fertilizer water or fermented rice washing water, etc.

In the cultivation of orchids, in addition to iron deficiency, the lack of other elements will also cause similar physiological diseases. According to the characteristics of different symptoms, we should determine what kind of element is lacking, make treatment and diagnosis, prescribe the right medicine to the case, and properly apply fertilizer containing this element, so as to achieve the purpose of prevention and treatment. The symptoms of element deficiency are briefly described as follows:

(1) potassium deficiency: it can cause the end leaf margin and leaf tip to turn yellow and brown, and the chlorophyll is often irregular striped spots, gradually connected into line segments. The order of the disease is the old leaves before the new leaves.

(2) magnesium deficiency: the old leaf yellowed day by day, the leaf tip of the middle-aged leaf yellowed and withered day by day, and the leaf edge of the middle-aged leaf often had linear yellow-red spots, which were gradually connected into stitch spots (commonly known as Causeway green).

(3) Manganese deficiency: there are often sunburn plaques, and some spots can be seen in the plaques.

(4) Zinc deficiency: the middle part of the bottom leaf showed light rust-like spots. (Liu Zhongjian)