What is the disease of the base of the old orchid seedling leaves that are black for half a year?

Lack of water. This is a typical symptom of dehydration of the plant, which is manifested by a blackening of the base.

According to the situation described, the main reason for the blackening of the leaves is infection with germs, both bacterial soft rot and fungal stem rot can cause blackening at the base of the leaves.

The reasons why the tips of orchid leaves are black and dry are as follows:

1. The water is more focused

If the orchid is watered too much, the roots will be suffocated by lack of oxygen, and the nutrient water cannot be transported to the leaf tips far from the roots in time, which will cause the leaf tips to lose their nutrients and dry tips.

This kind of dry tip is most likely to appear on the peripheral old leaves, new leaves do not appear for the time being, there is no major change in leaf color, dark green and shiny, and the dry tip is usually brown or black. If you don't pay attention to water control, the dry tip area will gradually increase and spread upwards to other healthy leaves.

2. The water is less yellow and the tip is yellow

If the orchid is not watered enough, the roots will be dry and water-scarce, and the tips of the old leaves on the periphery will dry up and turn yellow. The color of the leaves close to the dry area is pale yellow, and the old leaves on the periphery will turn yellow and die after a long time.

3. The light is too strong

When the orchid is exposed to too much light, the tips of the old leaves on the periphery will be scorched, and the color will turn brown or yellow. Different from the water with more focal tips, the color of the orchid leaves that are scorched because of exposure to the sun is not dark green, gray-green, dull, not erect, and slightly soft.

Botanical culture

Since ancient times, the Chinese people have loved orchids, orchids, orchids, and painted orchids, and Da Zheng pointed out that the ancients had the admiration of "watching leaves is better than flowers". People appreciate the perseverance of orchids to be with plants and trees, not to compete with the crowd, not afraid of frost and snow bullying, and perseverance. Orchids have always been regarded as a symbol of nobility and elegance, and are known as the "Four Gentlemen" together with plum blossoms, bamboos and chrysanthemums.

In 1987, in the national top ten famous flower selection series, orchids ranked fourth after plum blossoms, peonies, and chrysanthemums. The orchid has been selected as the city flower by Baoding City in Hebei Province, Longyan City in Fujian Province, Yilan City in Taiwan Province, Guiyang City in Guizhou Province, Baoshan City in Yunnan Province, Shaoguan City in Guangdong Province, and Shantou City in Guangdong Province in China.

The tip of the orchid leaf is black and dry, which is generally due to insufficient air humidity, insufficient or too little watering, fertilizer damage, insufficient sunlight, and bacterial and fungal diseases.

When orchids grow in the mountains, the plants leave obvious signs on the soil surface, which can be used as a standard.

The size of the pot should also be commensurate with the size and number of plants, neither large pots but small plants, nor small pots, <>nor small pots and large plants. Generally, the number of plants is expected to be full in 2-3 years. The size of the plant is commensurate with the height of the pot.

It is not only conducive to growth, but also meets the requirements of ornamentation.

After the planting is completed, the first water must be watered, the potting soil must be soaked, the water droplets should be small, and the impulse should not be large.

If it is placed in a basin of water, do not soak it for too long. Once the potting soil is soaked, the pots are immediately removed and then placed in a shaded place for maintenance.

You can use "Yanwo microbial agent" + "root rooting agent" in the early stage, and the effect will be better when combined with Yanwo water-soluble fertilizer.

<> the phenomenon of black and dry orchid leaves, it may be that the orchid receives too much light in the process of growth, resulting in leaf burns, or it may be in the process of maintenance, providing too little water for the orchid, resulting in a lack of water in the plant, or it may be that the ambient temperature is too low, causing the orchid to be frostbitten, resulting in the phenomenon of dry and black leaves.

1. The light is too strong.

Orchid leaves appear black and dry, may be due to too strong light, orchids are suitable for growing in a sunny environment, in the process of maintenance, the light provided for it is too strong, it will cause the plant to be burned by strong light, the leaves are dry and black, so in the later maintenance, you need to shade the orchid.

2. Too little watering.

The blackened and dry leaves of orchids may also be due to the lack of water provided to the plants during the maintenance process. Orchids are suitable for growing in a more humid environment, and if the water provided for them is too little during maintenance, it will lead to the lack of water and drying up of the leaves of the plants, so it is necessary to replenish water for the orchids in time and soak all the soil.

3. Improper fertilization.

Orchid leaves appear black and dry, may also be due to improper fertilization, orchids in the process of growth of nutrients need more, but frequent provision of nutrients for it, will lead to plant leaf burns, at this time it is necessary to water a lot of water to the soil, dilute the amount of fertilizer in the soil, so that the orchid can resume healthy growth.

4. The temperature is too low.

Orchids are suitable for growing in a warmer environment, if the ambient temperature is reduced, no warm measures are taken for the orchid, it will cause the leaves of the plant to be frostbitten, resulting in the phenomenon of drying and blackening, at this time it is necessary to cut off the blackened leaves of the orchid and move them into a warm indoor maintenance.

The reasons for the black and dry tips of orchid leaves are: too strong light, dry air, alkaline water quality, too strong fertilization, and poor ventilation.

1. The light is too strong

Orchids like shade, afraid of direct sunlight, if the sunlight is too strong, it is easy to appear black and dry at night, but if the shade is too serious, there will be little flowering, the flower color is not bright, and the flowers are not fragrant.

2. Air drying

Orchids prefer moist environments and are afraid of dry air. If the air is too dry, it is easy to have black and dry leaf tips, so when raising orchids, you need to keep the air environment moist.

3. The water quality is alkaline

Orchids like slightly acidic soil, but also like slightly acidic water quality, if the orchid watering with alkaline water, it is easy to cause the orchid to appear yellow leaf tips black and dry, so when watering, the water used must pay attention to some.

4. The fertilization is too thick

Orchids like thin fertilizer and frequent fertilization methods, afraid of using raw fertilizer or thick fertilizer, but also afraid of fertilizing when the growth is slow, otherwise it is easy to cause fertilizer damage and root burning, resulting in black and dry leaf tips.

5. Poor ventilation

Orchids like moist and well-ventilated jujube with environment, if the ventilation is not good, coupled with high temperature and humidity, orchids are prone to pests and diseases, and after the orchid is diseased, there will also be black and dry leaf tips.

The reasons for the black and dry tips of orchid leaves may be: low temperature frost damage, too strong light, too much water, and fertilizer damage.

1. Low temperature freezing damage

Orchids have poor low temperature tolerance, and if the plant is exposed to low temperature frost damage in winter, its roots and branches will stop growing, resulting in black and dry leaf tips, so it is necessary to move the orchid indoors to a warm place for maintenance in winter.

2. The light is too strong

Orchids are not tolerant to strong light, if they are directly irradiated by strong sunlight during growth, there will be black leaf tips, it is best to place the plants on the balcony to maintain, and immediately build a shade net for them when the strong light is strong in summer.

3. Too much water

The waterlogging tolerance of orchids is poor, and excessive watering will cause water accumulation in the potting soil, which will affect the respiration of the root system and cause the leaf tips to turn black.

4. Fertilizer impact

When fertilizing orchids, it is necessary to meet the requirements of low concentration, long interval and low dosage, otherwise the plant will burn the root system after being affected by fertilizer, and the leaf tip will be black and dry, usually fertilized 10 cm away from the orchid root system, not too close.

Ornamental value of orchids:

The orchid is a unique style of flower, and its ornamental value is high. The hall of the orchid is changed to the spine color of the light and elegant, among which the tender green, yellow and green are the majority, but especially the amateur is precious. The aroma of orchids is clear but not turbid, a pot in the room, fragrant.

Hand Pei Lan Rui two or three planting, the day warm wind and the second opening; I don't know the fragrance in the room for a long time, and there are butterflies flying when I push the window. ”

This poem of the ancients vividly expresses the fragrance of orchids. Some of the orchids are dignified and beautiful, and some are graceful and luxurious, and they are full of changes. The leaves of the orchid are bright green all year round, both rigid and soft, and have a beautiful posture, even if it is not in flowering, it is like a living work of art.

The weeping dew is chaotic, and the wind shadow is oblique; The laity is more than that, and the leaves are better than the flowers." This poem is used to describe the graceful beauty of orchid leaves. Put a few pots of orchids, decorate the room, suddenly feel full of business, the day of blooming, the fragrance bursts, will make you feel vibrant, relaxed.

The reasons why the tips of orchid leaves are black and dry are as follows:

1. Natural factors.

2. Improper maintenance management.

Improper management in the daily maintenance process of orchids can also lead to blackening of orchid leaf tips, which are commonly caused by too strong light, insufficient light, too much watering, too little watering, excessive fertilization, and too concentrated spraying, all of which are artificially controllable.

The orchid is maintained in a semi-shaded or shaded place with sufficient light, and thin fertilizer is applied frequently, and the special fertilizer for orchids can be used with microbial agents in Yehong time, which is mild and does not hurt the roots, and the Yilan bacteria form a protective barrier around the orchid roots, which can reduce pests and diseases.

3. Diseases. Orchid strains are attacked by pathogens will also cause the tip of the orchid leaves to turn black, the common ones are brown spot, anthracnose, black spot, leaf blight, blight, and the above five common diseases generally do not appear singlely, and many times will be multiple.

Symptoms occur at the same time or alternately, which is somewhat difficult to prevent, and it is best to prevent and try to avoid the occurrence of these diseases. First of all, when potting, the planting material and orchid plants should be disinfected, and the ventilation should be strengthened in the maintenance process, and the fertilization should be balanced, and the nitrogen fertilizer should not be biased, and poor ventilation and partial nitrogen fertilizer will be conducive to the occurrence of diseases.

4. The temperature is too low.

Orchids are suitable for growing in an environment of 15-25, and the temperature is too low to cause frostbite to the orchid, which makes the leaf tips black. Keep the orchids indoors in a warmer place. Do not immediately put it in a place where the temperature is too high, if the temperature difference is too large, it is easy to cause secondary damage to the roots.

5. If the orchid is placed outdoors by strong winds, the dry tip is often blown by the strong wind, and the leaf tip is generally gray-white, accompanied by the crack at the top of the leaf tip, and there will be cracks on the serious leaves, and the cracks are gray-white or yellow-brown after drying, and the color is lighter.