What are the diseases of crab claw orchid? Disease and prevention of crab claw orchid, treatment of

The main diseases of crab claw orchid are anthracnose, rot disease and leaf blight, which mostly occur in high temperature and high humidity environment, and the diseased plants need to be uprooted and destroyed, and drugs can be used to prevent and control them in the early stage.

Common diseases of crab claw orchid are anthracnose, rot and leaf blight. After the occurrence of the disease, it not only seriously affected the normal growth of crab claw orchid, but also seriously damaged the ornamental property of crab claw orchid.

1. Anthrax.

The anthracnose of crab claw orchid mainly harms the leaf-like stem nodes, which are the "leaves" we see, and generally appear water-stained light brown dots on the stem nodes at the beginning of the disease, and gradually turn into brown near-round lesions as the disease progresses.

2. Stem rot.

The stem rot of crab claw orchid generally occurs on the stem node or the base of the stem of crab claw orchid, and the yellowish yellow spot appears in the early stage of the disease, the lesion is slightly sunken, the disease is seriously delayed, the lesion expands, and reddish-brown soft rot appears.

There are two common diseases of crab claw orchid. The first is stem rot, which mainly occurs at the base of the stem, and will have brownish-green yellow spots in the early stage, and then turn black-brown in the pants stage. After the onset of the disease, zinc should be sprayed to avoid further infection.

The second is leaf spot, which mostly starts from the edge of the leaf, with gray spots in the early stage and dark brown in the later stage. After discovery, the diseased leaves should be removed in time, and spraying should also be sprayed. Pay attention to improve the environment in the later stage, ventilate more, and reduce humidity.

1. Stem rot.

Symptoms: Crab claw orchid infection with stem rot mostly occurs at the base of the stem. In the early stages of the disease, there will be brownish-green macula, and the lesions will be irregular. In the later stage, the lesions will turn black-brown and sunken, and the tissues under the skin will decay and dry, and there will be black granularities.

Prevention and control method: When cultivating, the substrate must be disinfected before use to ensure that there are no germs in it. When managing, we should pay attention to the amount of watering and the number of times we water each time, do not let the environment be too wet, properly control the humidity, and prefer dry rather than wet.

In addition, at the beginning of the disease, it is necessary to spray zebsen zinc to avoid further infection.

2. Leaf spot disease.

Symptoms: Leaf spot disease usually starts from the edge of the leaf, and the initial stage is gray spots, slightly sunken downward. After the later expansion, the edges will be dark brown, and the lesions will slowly dry up in the later stage, and gray-black mildew spots will appear.

Prevention and control methods: Once it is found to be infected with leaf spot, it is necessary to remove the diseased leaves in time to reduce the source of infection. In addition, drugs should be used at the early stage of the disease, and the drug can be 800 times the liquid pentachloronitrobenzene fungicide, or directly applied to the leaves.

3. Precautions.

If you want to avoid the crab claw orchid infection, you must not only disinfect the soil, but also pay attention to the methods when managing it. It should be placed in a well-ventilated place, especially in the hot summer. Ensure good ventilation, reduce watering, and be sure not to provide a stuffy, humid environment, otherwise it is easy to get infected.

Stem rot, irregular brown spots will appear on the leaves after crab claw orchid is infected with stem rot, and it can be sprayed with zeb zinc solution**; Leaf spot disease, after being infected with leaf spot disease, irregular gray spots will appear on the edge of the leaf in the early stage of the disease, and 800 times the liquid of pentachloronitrobenzene fungicide can be sprayed**; Red spider, red spider will dilute the sap in the leaves, making the leaves yellow and falling, and can be sprayed with dimethoate emulsion for control.

After crab claw orchid is infected with stem rot, there will be greenish-brown spots in the early stage of the disease, and the lesions will become black-brown depressions in the later stage, and the subcutaneous tissue will be rotten, and there will be black granular matter.

Prevention and control methods: the soil needs to be sterilized and disinfected before each cultivation, and the amount of watering needs to be strictly controlled during the maintenance period to ensure that the soil is in a slightly moist state.

After the crab claw orchid is infected with leaf spot, there will be gray spots on the edge of the leaf in the early stage, slightly concave downward, and the edge will be dark brown after it expands in the later stage, and the disease spot will gradually wither, and gray-brown mildew spots will appear.

Prevention and control methods: After the discovery of crab claw orchid infected with leaf spot disease, the diseased leaves need to be removed in time, and 800 times of pentachloronitrobenzene fungicide needs to be sprayed at the beginning of the disease, and the agent can also be directly applied to the leaves**.

During the growth period, the crab claw orchid is also susceptible to the attack of red spiders, which will pierce the leaves with their mouthparts to suck the juice, so that the chlorophyll is destroyed, and the leaves will appear to turn yellow and fall off.

Prevention and control methods: When crab claw orchid is infected with red spiders, it is necessary to open windows frequently for ventilation and spray water mist to increase the humidity of the air, which can effectively prevent the invasion of red spiders. It is also necessary to spray dimethoate emulsion on the leaves every half a month for control.

Scale insect is also a common pest, often distributed on the branches, fruits and leaves of crab claw orchid, sucking sap, when the situation is serious, the branches will wither and die, and the secretion of scale insect can induce coal stain disease, which is more harmful to plants.

Prevention and control methods: After the scale insects are found on the leaves, 50 ml of vinegar can be extracted, the cotton ball can be wet in the vinegar, and the stems and leaves with the pest can be wiped with a wet cotton ball, which can effectively kill the scale insects on the leaves.

Common pests and diseases of crab claw orchid are red spiders, scale insects, anthracnose, leaf blight and rot diseases, etc., red spiders and scale insects mainly harm the leaves, which can be sprayed directly, and the three diseases will make the plant leaves yellow, local brown spots, and the whole plant rots when it is serious, and carbendazim can be sprayed once a week for control.

1. Red spider

Red spider is harmful to the leaves of crab claw orchid, often open windows for ventilation, spray near the plant to increase air humidity, regularly spray dimethoate solution, once every 15 days for sterilization, can prevent red spider to a certain extent, if it has been infected, it is necessary to manually remove or directly pick the leaves, or spray directly with pine emulsion.

2. Scale insects

Scale insects are small white insects that often gather together, and the main damage is also the leaves of plants. In the early stage of discovery, the insect body on the leaf can be scraped out, or cleaned with water, which can be controlled to a certain extent, and if it is more serious, it should be directly sprayed with imithion emulsifiable concentrate emulsifiable concentrate to completely remove.

3. Diseases

Crab claw orchid often appears and also anthracnose, leaf blight and rot disease, the symptoms are relatively similar, all plant leaves are yellow, local brown spots, severe plant rot and death. At the beginning of the disease, carbendazim solution can be sprayed once a week, three times in a row, and in severe cases, it should be burned intensively to avoid infecting other plants.

4. Comprehensive management

In the process of maintenance, it is necessary to ensure that the plants are in a ventilated environment, and the closed environment is easy to develop and spread, and it is necessary to spray sterilizing agents regularly for prevention. When the plant has symptoms of being infected, it is necessary to clear the diseased leaves in time to control the spread of pests and diseases, and if the situation is more serious, spray directly with pesticides.

1. Tools Raw materials: sufficient light, good ventilation, moderate watering and fertilization, temperature control, insect control drugs, etc.

2. First of all, we need to understand some of the living habits of crab claw orchid. As a common green plant, its cold and drought tolerance is not strong, and the suitable temperature for survival should be around room temperature. The cultivation soil should have good air permeability and drainage, and the demand for light is also great.

3. Therefore, if you want to prevent and control the pests and diseases of crab claw orchid, you must first start from the environment. If it is farmed at home. Then try not to put it outdoors. Because the temperature difference between morning and evening is large, humidity and air mobility will also change, so try to breed indoors.

4. The place should be mainly on the window sill or balcony as much as possible, so as to ensure that there will be regular and sufficient light every day, but strong light should be avoided. A hygrometer can be used to detect the humidity in the air. When it is too dry, humidification can be applied.

5. The degree of watering of crab claw orchid should be grasped well. A watering deficit should be watered thoroughly, and you can see that there is a slight oozing of water at the bottom of the pot to prevent stagnant water from breeding germs. The flower fertilizer is mainly thin fertilizer or natural material to prevent excessive nutrients from burning the crab claw orchid, or making the microorganisms in the flower soil grow rapidly and destroy the crab claw orchid.

6. At the same time, potassium permanganate solution can be used to spray the roots and flower soil of crab claw orchid to play a role in disinfection. At the same time, you should also have medicines for crab claw orchid diseases and insect pests in your hands, and be prepared to deal with them.

7. If pests and diseases occur, Lu Xian should consult professionals before using these drugs, and know the dosage and dosage to prescribe the right medicine.

When crab claw orchid is infected with rust spot, it is mainly manifested on the stems and leaves, and generally does not cause damage to the roots. Therefore, we generally do not need to repot and change the soil for it, but combine leaf cutting and spraying to clean and kill. At the same time, improve the maintenance conditions to avoid a humid and stuffy environment.

However, in general pruning, only the infected and diseased parts of the stems and leaves need to be cut off, and it is not necessary to prune the good stems and leaves. The plants are then placed in a well-ventilated, well-lit area to dry the wound before spraying with medicine. When taking medicine, it is also necessary to strictly follow the instructions for use, mainly to control the concentration of the liquid medicine.

If carbendazim or methyl tobuzin is used, it is generally diluted with water at 800-1000 times, and then sprayed after full shaking. Not only that, the frequency of spraying should also be controlled, generally sprayed once at the beginning of the disease, and kept spraying once every 5-7 days. Usually 2-3 sprays in a row are fine.

And not only can crab claw orchids be sprayed in this way when rust grows, but also when the leaves rot.

Anthracnose, rot disease and leaf blight often occur in crab claw orchid, which damages leafy stems, especially under high temperature and humidity. Plants that occur seriously should be uprooted and burned intensively. At the initial stage of the disease, 500 times of 50% carbendazim wettable powder was sprayed once every 10-15 days, a total of 3 times.

When the scale insect is serious, the surface of the leaf-like stem is covered with a white shell, so that the plant growth is weakened, and the damaged part is yellowish-white, if the damaged plant is lighter, it can be scraped off with bamboo chips, and in severe cases, it is sprayed with 25% imidothion emulsifiable concentrate 800 times.

In the event of red spider damage, spray 1000-1500 times oxidized dimethoate solution for prevention and control.