What should I do if there are red spots on the leaves of my gentleman s orchid?

The reason for the yellow leaves of the Gentleman's Orchid is mainly due to improper management. There are several reasons for the yellow leaves of Junzi orchid:

1. The water is too large: the water in the pot is too long, and the leaves are easy to produce infiltration yellowing, which occurs at the tip of the young leaves, and the symptoms develop from top to bottom.

2. Lack of water: too dry, or watering half of the water every time, the old leaves should be yellow tips.

3. Hypertrophy: too much fertilizer is too concentrated, which will cause root burning and yellow tips of leaves.

4. Lack of elements and loss of green: If there is a lack of iron in the potting soil, the top of the leaves will turn yellow first. If nitrogen is deficient, the new leaves are yellowish-white.

5. Sunburn: After strong direct sunlight (summer), yellow spots occur on leaves, which is called sunburn. When dry at high temperatures (above 30), the leaves are also prone to yellowing.

6. Pollution: The leaves of the orchid should be kept clean, if it is splashed with dirt, the polluted place may turn yellow.

7. Frost damage: Frost damage occurs when the orchid is below 0, and the symptoms are still yellow leaves.

In order to restore the normal growth of the monarch orchid after yellow leaves, it is necessary to find out the source of the disease and take corresponding measures. The method is: dig out the whole Junzi orchid to check the roots, such as rotten roots, remove the rotten parts, re-cultivate with new soil, and pad a layer of fine sand under the roots.

The potting soil should be loose humus, and the pH value (pH value) should be neutral. The soil is not dry or wet, and it has good aeration. Junzi orchid likes weak light, except for winter, summer should be placed in a place of half shade and half yang, avoid direct sunlight.

If it happens"Lack of green disease"Liquid fertilizer (such as alum fertilizer water) can be added, the main point is that the amount is less and more often, be careful not to splash the fertilizer or mud on the leaves, and the stems, such as splashing on the leaves, should be washed off with water in time. Solid fertilizers should also be applied in direct contact with fleshy roots as well.

If this symptom appears in the leaves of the junzi orchid, it is more convenient to understand it first and then solve it.

Improper fertilization The application of fertilizer that is not fermented well allows the germs to multiply in the potting soil.

Improper soil change If the potting soil is not changed for a long time, the nutrients in the potting soil are reduced, and there are pathogenic bacteria. If the plant has a wound, it is susceptible to bacterial infection.

Imbalance of nitrogen, phosphorus and potassium in fertilizers, especially when less potassium fertilizer or fertilizer directly touches the roots. Rust spots on individual leaves are often caused by direct contact with a fleshy root or a wound caused by the fertilizer.

Do a good job of prevention First of all, we must prevent the plant from rotting roots, so that the leaves can get sufficient nutrition, and then it is necessary to put an end to trauma, prevent the spread of wounds, the amount of fertilizer must be controlled, do not hypertrophy, do not water the false bulb in summer, pay attention to ventilation in summer, cool down and strengthen management, regularly spray carbendazim, chlorothalonil, methyl top, agricultural streptomycin and other sterilization drugs for prevention and control, that is, it can reduce and eliminate the occurrence of leaf spot and chloranthomycosis.

Replace the new soil to prevent and control leaf spot, and the method of soil replacement can be solved. When changing the soil, wash the fleshy roots with clean water, dry them and then put them on the pot. If any of the leaves are rotten and unsightly, simply cut them off.

Spraying agent fungus is an organic sulfur arsenic compound fungicide, which can prevent and control a variety of true grate diseases, such as white rot, brown spot, stem spot, etc. Use a concentration of 500 1000 times the liquid, spray once every half month, and spray 3 or 4 times in a row to collect effect. Antibacterial is unique to toxicity, pay attention to safety when using.

Your Monarch Orchid has leaf spot disease.

The disease mainly infects the leaves, and there are small brown spots on the leaves at the initial stage of susceptibility, which gradually expand into yellow-brown to gray-brown irregular lesions. The lesion is slightly sunken and the edges are slightly raised. In the later stage, the lesions are dry and have small black spots on them.

The causative agent of leaf spot disease is a true yin. When too much nitrogen fertilizer is applied in cultivation, and there is relatively little phosphorus and potassium fertilizer, the disease is prone to occur. Under high temperature and dry conditions, or when the scale insect is seriously affected, leaf spot is prone to occur.

High temperature, rainy and humid weather is prone to disease, or flower pots are placed too densely, excessive watering, poor ventilation, excessive humidity, are prone to disease.

Prevention and control methods: 1. Remove diseased leaves and diseased remains. Reduce the source of infection and control the progression of the disease.

2. Control scale insects, avoid insect pests, and reduce infiltration. If the leaves have scale insect hazards, they should be removed in time, and the leaves of Junzi Orchid are large and the number of leaves is small, which can be scraped manually.

3. At the initial stage of the disease, spray 50 carbendazim 1000 times, 70 tobuzin wettable powder 1000 times, and 50 dysenammonium 1000 times for prevention and control.

4. Strengthen management, should not apply nitrogen fertilizer, and appropriately increase phosphorus and potassium fertilizer. Maintain good ventilation conditions, and do not place the pots too closely. Water should be watered from the edge of the pot, preferably with the basin method. Diseased plants should be kept away from the group to reduce infection of other plants.

The leaves of the orchid are prone to various disease spots, which affect the growth and ornamentation. Among them, anthrax and leaf spot are the most common. When anthracnose and leaf spot damage the orchid, brown spots are produced at the beginning, but the latter is slightly lighter in color, and the former is moist.

As the disease progresses, the anthrax lesions gradually expand to become round, oval or semicircular, with concentric wheel lines appearing inside; Leaf spot lesions enlarge and appear irregularly shaped. Both lesions have small black dots on the lesions, and the lesions dry up in the later stage. The causative agent of Anthracnose is a fungus of the genus Disc Bubble, while leaf spot disease is caused by a fungus of the genus Macrostem.

The germs are mostly invaded by wounds, and they are prone to disease in rainy and humid seasons and when the potting soil is too wet and too dense. Measures to prevent the occurrence of disease spots on the leaves of Orchid: First, strengthen cultivation management, avoid rain and excessive humidity, and maintain appropriate plant row spacing.

The second is to pay attention to the elimination of pests and avoid the formation of wounds. The diseased leaves of Sanling were cut and burned in time, and sprayed with 1000 1500 times of 70-methyl tobuzin wettable powder at the early stage of the disease, which was helpful for disease control.

Mycosis! It is recommended to go to the agricultural material store to get some fungal agent and spray! Or remove the spotted leaves to avoid infecting the good leaves!

And then there is the proper sunbathing!

Symptoms: Yellowing of Junzi Orchid is also called green deficiency. The yellowing disease of Junzi Orchid is caused by a sharp shortage of water and iron. The affected leaves are mammital.

White patches, or all of them turn yellowish-white, wilted, shriveled, and withered in severe cases. There are many manifestations of yellowing of the orchid: all the leaves turn yellow, which is often a symptom of daily burn.

The yellowing of the leaves from the tip is often caused by the fact that the culture soil is not completely rotten, or there is too much fertilizer and water, resulting in root burning. The yellowing of individual leaves is likely to be the result of fire, cold wind, or acid-base erosion. Sometimes the leaves of the orchid turn yellow, mostly due to nutritional deficiencies.

There is also a yellowing of the leaves, which is caused by insufficient light.

Prevention and control methods: In summer, the orchid should be placed in a shade, cool and ventilated place, irradiated with a shade of 50% light to prevent the occurrence of solar fever, and spray a new high-lipid film to prevent bacterial infection, improve the ability to resist natural disasters and improve the intensity of photosynthesis. To cultivate the orchid, it is necessary to use a slightly acidic humus soil that is well rotted and loose.

When the temperature exceeds 30, less or no fertilizer should be applied and the amount of watering should be reduced accordingly. When the temperature is high, spray water around the plant every day to cool down. Spraying the flowers at the bud stage of the Junzi Orchid can promote strong flower buds, hypertrophic petals, bright flower color, strong flower fragrance and prolonged flowering period.

In winter, the sun should be strengthened, and it is best to have a fixed time every day to sunbathe the Monarch Orchid. After such observation and management, Monarch Orchid rarely has yellowing, spraying new high-fat film to keep warm and antifreeze, and safely overwinter.

1. Cut off the leaves. Most of the yellow spots on the leaves of the orchid are caused by leaf spot, which spreads very quickly, so you can cut off all the diseased leaves of the orchid first, and then burn them all and bury them deep in the soil to prevent the spread of leaf spot.

2. Change the soil in time. In addition to cutting off the diseased leaves, it is also necessary to change the soil in time, before changing the soil, clean the roots of the orchid, if you find rotten roots, you can cut it off, and then plant it in new soil.

3. Spray the agent. It can also be sprayed with pesticides for prevention and control, spraying fungi with a concentration of 500-1000 times the liquid, and fungi can effectively prevent and control symptoms such as leaf spot.

Orchid is a perennial herbaceous plant of the genus Lycoris family, which is a semi-negative plant, likes coolness and avoids high temperatures. The suitable temperature for growth is 15-25, and the growth will stop if it is lower than 5, which has a high ornamental value.

This is a disease of the Gentleman's Orchid: soft rot. Germs often invade from wounds. At the onset of the disease, light yellow water-stained spots appear on the leaves, and then expand into regular lesions, so that the leaves become brown soft rot compounds, and there is fungal liquid flowing out of the lesion wounds.

Prevention and control methods: Once the disease is found, the diseased plants should be separated immediately, the culture soil around the plants should be peeled off, the diseased parts should be exposed, the rotten leaves should be broken, the rotten parts should be scraped off with a sterilization knife, and the sunlight should be properly irradiated to keep the ventilation and dryness; If there are many decayed plants, all diseased tissues must be removed, soaked in potassium permanganate aqueous solution for hours, rinsed with water to dry, smeared with plant ash at the incision, and planted in a new pot, placed in a ventilated place with low temperature; Drugs** can be sprayed or smeared with penicillin or streptomycin or oxytetracycline plus double water solution, which has a certain effect.

Control watering, pay attention to ventilation, can be properly astigmatized, sprayed with carbendazim or methyl tobuzin, and there are instructions for use on the drug packaging, just do it according to the above

It is brown spot disease, is a typical fungal disease, the initial symptoms start from the lower leaves, gradually spread to the upper part, the initial is round or oval, purple-brown, the later stage is brown spot black, the diameter is 5-10mm, the boundary is clear, the disease spots can be connected into a piece in severe cases, so that the leaves are yellow and fall off, affecting flowering.

The pathogen overwinters in dead leaves or soil with mycelium or conidia, and begins to occur in early summer with the help of wind and rain, and in autumn, the harm is serious, high temperature and humidity, insufficient light, poor ventilation, continuous cropping, etc. are conducive to the occurrence of diseases.

Prevention and control methods of brown spot disease:

Before or when the high temperature and humidity weather comes, it is necessary to apply less or no nitrogen fertilizer, maintain a certain amount of phosphorus and potassium fertilizer, avoid string irrigation and flood irrigation, especially try to avoid evening irrigation.

When dead spots appear, the dew should be removed as soon as possible in the morning to help alleviate the condition. Properly pruned residual branches should be removed in time, and timely and effective chemical control should be carried out.

There are generally several cases of yellowing of the leaves of the orchid, if the bottom leaves grow new roots from the axils of the leaves, the yellowing of the leaves is a normal metabolism. One situation is that the leaf axils do not grow new roots and the leaves turn yellow, which is mostly due to soil quality, poor air permeability, too much fertilizer or poor watering and humidity control of the roots, which may make the leaves of the Junzi orchid yellow. Water can not be watered, the root tip lacks water, it will make the leaf tip turn yellow and dry tip, in this case, it must be watered thoroughly, in summer, every 7 10 days at the bottom of the pot can sit a small pot of water, so that you can ensure that the water is watered, this is called the water immersion method.

Another condition is the appearance of yellow spots of varying sizes on both sides of the leaves, called brown spots. This is mainly due to the fact that the soil is relatively grown, and the amount of fertilizer applied is too large. Generally speaking, the potting soil should be made of humus, with good air permeability, especially in summer fertilization, thin fertilizer should be applied frequently, and fertilizer water should not be dripped onto the leaves, so as to prevent the occurrence of spot removal.

In another case, due to the abundant sunshine and high temperature in summer, if the orchid is exposed to the sun, solar fever will also occur, and the leaves will turn yellow and wilt in the heavy. In summer, shading should be taken, a ventilated place should be placed, the shade avoidance degree should be 50, and the south window of the home can be shaded with a layer of gauze. One is the common disease of Junzi Orchid, anthrax or macular disease, which can be treated with bactericidal drugs such as chlorothalonil, carbendazim, etc., and then it is to remove the diseased leaves to prevent infection, and the second is to burn, Junzi Orchid is a negative plant, not to be exposed to the sun, and the Junzi Orchid that is often indoors is more sensitive to sunlight and is easy to burn, so it can not be placed outside to see the light.

Is it placed in a place where the sun is very strong, like sunburn, in my opinion, its leaves are not too green, the store nitrogen fertilizer.

It may be that the nutrients of the soil and water are insufficient, and you can try to use the Diyi fertilizer of the water-retaining loose soil.

Generally, the fertilizer is not fermented and there is more, which burns the root system, causing yellow spots on the leaves and slowly rotting. It's a lot of rotten!

Orchid is a plant of the genus Lycoris family, which is an indoor ornamental flower with beautiful flowers and leaves, and has a very high ornamental value. However, in the process of breeding, many flower friends have encountered the situation of spotted leaves of Monarch Orchid, which not only greatly affects the aesthetics of Monarch Orchid, but also may lead to the death of Monarch Orchid if not treated in time. In general, the spot on the leaves of the orchid is caused by leaf spot, especially in the rainy and humid season in summer, coupled with the poor ventilation of the growth environment, the orchid is very prone to leaf spot, the beginning is the back of the leaf and is successively appearing yellow or orange dots, if the prevention and control is not timely, the whole leaf will soon become full of holes and lose its beauty.

Solution: At this time, it is necessary to remove the diseased leaves in time, and then apply the lesions with potassium permanganate solution, or spray the plants with 50% carbendazim 1000 times. Fertilization is also very crucial.

The nutrient requirements of the orchid are also different at different stages of growth and development, for example, more nitrogen fertilizer is applied during the growing period, and more phosphorus and potassium fertilizer is applied before the flowering stage. In addition, improper fertilization can also lead to rust spots on leaves, such as low potassium fertilizer or direct contact with roots during fertilization, because the fertilizer is in direct contact with a fleshy root or a rust spot caused by contact with wounds, resulting in leaf spots.