The main reason for the scorched tip of orchid leaves

There are many reasons for the scorched tip of orchid leaves, some are caused by natural factors, some are caused by improper management, and some are caused by diseases. Among them, the damage of coke tip caused by disease is the most serious.

1. The focal point caused by natural factors

(1) the humidity is too low. The focal tip of orchid leaves is closely related to water supply, especially the longer leaves of Huilan, if the water supply is not high, it is bound to cause the scorched tip of orchid leaves. The water supply of orchid leaves is transported by the roots and absorbed from the air. Therefore, the reason for the focal tip of orchids has a lot to do with the low air humidity, in addition to the excessive dryness of the potted soil. If the humidity in the air is too low and too dry, the transpiration of orchid plants will be strengthened, and the imbalance between water supply and demand of orchid leaves will lead to the scorched tip of orchid leaves. Generally speaking, the indoor orchid cultivation air humidity is larger, the orchid leaf coke tip situation is not serious, while the outdoor orchid cultivation air humidity is difficult to control, the orchid leaf coke tip situation is more serious.

(2) the climate has changed suddenly. In 2007, for example, people just moved the orchids out of the orchid houses with high humidity, that is, they encountered the worst drought in decades, the river dried up to the bottom, and the air humidity was extremely low, so the coke tip of orchids was more serious. Although the plum rain season comes late, but it takes a long time, about 50 days, the orchid leaves that have not seen the sun for a long time are both thin and soft, and immediately encounter the hot sun just out of the plum rain season, so the Jiaojian situation becomes more and more serious. The author visited several outdoor orchid courts and found that the coke tip of Huilan was quite serious.

(3) Air pollution. Lanyuan is near a sewage area, an industrial area, or someone burns harmful substances near Lan Yuan, causing harmful gases in the air to harm the orchid leaves and causing scorched tips.

2. Focal point caused by improper management

⑴, light is too strong. Lack of shading or insufficient shading in summer, resulting in too strong light, resulting in the scorched tip of orchid leaves.

⑵, long-term recuperation. Orchids in the growth process of excessive shading, too weak light, long-term shade, resulting in thin and weak orchid leaves, if suddenly let orchids see strong light, it is easy to cause orchids scorched head shrunk leaves.

⑶, water-injured seedlings. Watering too often causes rotting roots and scorching tips. Spray water in the sun, the water gathers the leaf tip, and the focal tip is illuminated by strong light. The water quality of the watering is polluted, or the orchids exposed to acid rain can also cause scorched leaves.

⑷, fertilizer injures leaves. When applying fertilizer to the root system, the fertilizer concentration is too high and the frequency is too frequent, so that the orchid root is scorched black, and then the orchid leaf scorched tip.

⑸, too strong pesticide application. The proportion of pesticides has a certain proportion, if the concentration exceeds the standard, the spraying amount is too much, resulting in the accumulation of pesticides in the leaf tip of orchid, causing damage to the leaf tip and causing coke tip.

⑹, plant material is too dry. Lazy watering caused the plant in the basin to be too dry to meet the water demand of the orchid plant, forming an empty root, the orchid leaf could not get normal water supply, and the coke tip of the orchid leaf was caused by the loss of water.

The above several kinds of orchid leaf focal tips caused by natural factors or improper management are usually called physiological focal tips, which are usually black, and there are no black horizontal lines in the pathogeny, so they will not move forward rapidly, the course of the disease is relatively slow, and the harm degree is not great. As long as we find out the cause and manage the symptoms, the harm of orchid leaves can be controlled.

2. The focal point caused by bacteria

⑴, bacterial brown spot. The brown spot of orchid is caused by bacteria infecting orchid leaves, which is the most ferocious scorched tip disease in orchid leaf diseases. It is easy to identify, and its disease spot is brown. At the initial stage of the disease, the leaves have waterlogged discoloration spots that seem to have been scalded by boiling water, and rapidly push forward, resulting in the death of the whole leaf, which is highly contagious, spreads rapidly and does great harm.

⑵, anthrax. Anthracnose of orchid is caused by fungi, which is the most common scorch tip disease of orchid leaves, which is easy to identify. Its remarkable feature is that there are some wavy transverse black belts after the leaf tip is damaged and withered, and if the focal tip leaves are cut off, it will continue to move forward, which is a serious scorch tip disease.

⑶, black spot. The black spot of orchid is caused by fungi, which is one of the most common scorch tip diseases in orchid leaves, which is easy to identify. its remarkable characteristic is that the disease spot is round, scattered on the leaf surface and leaf edge, and can be linked together in serious cases, resulting in the loss of ornamental value of the whole orchid leaf.

⑷, leaf blight. The leaf blight of orchid is caused by fungi, which is one of the more ferocious scorch tip diseases, which is easy to identify. Its remarkable feature is that in the later stage, the leaf tip turns gray and white, the whole leaf dies, the junction of the diseased leaf is dark brown, and it advances continuously, even making the whole leaf dry up rapidly and do great harm.

⑸, blight tip disease. The tip blight of orchids is caused by fungi and is the most common scorched tip disease, which is easily identified. it is characterized by grayish yellow dead parts, no banding marks (different from anthracnose) and dark brown markings at the junction.

The above diseases sometimes occur alone, and sometimes several diseases occur at the same time. For example, orchids suffer from not only leaf blight but also black spot, which still exists after the leaves die. For example, the orchid leaf suffers from both anthracnose and black spot, and the two diseases exist at the same time after the death of the leaf.

The scorched tip of the orchid leaf caused by the pathogen is generally more serious, and there are usually black stripes at the cause of the disease, and this black transverse spot is constantly moving forward, and in serious cases, the whole leaf is scorched, and even if it is cut off, it will continue to scorch, and then cut and re-scorch until bald. It even constitutes a deterrent to the life of the orchid plant, which must not be taken lightly.